Chlorotabanus microceratus n. sp. (Figure 10 A–I) Type locality: Brazil (MA, Mirador). Diagnosis: Small sized (7.6–10.7 mm). Frons with parallel side and slight convergence at the base. Flagellum of the antenna with a short basal plate almost as wide as high, and with similar in length to the stylus. Thorax dark-brown with yellowish pilosity. Hyaline wing, except for the slight darkening of the costal cell. Apex of the hind tibia without black hairs. Abdomen greenish-yellow with yellowish pilosity. Description (Holotype Ψ): Body length 9.4 mm (Fig. 10 A–B); wing length 8.1 mm; wing width 2.8 mm. Head (Fig. 10 C): Eyes reddish-brown. Frons with a small reentrance in the mid basal region, with parallel sides, converging slightly at the base, F.I. 5.6, D.I. 1.1, grayish-yellow pruinosity and yellow pilosity. Subcallus, parafacialia, gena and face with pruinosity and pilosity as frons. First segment of the palpus and anterior third of the second segment light yellow with yellow hairs. Middle and posterior thirds are dark yellow, with yellow and some black hairs. Proboscis with greenish-yellow theca and dark green labella. Antenna (Fig. 10 D) with proximal region of the flagellum forming an accentuated dorsal projection. Flagellum with a short basal plate almost as wide as high, similar in length to stylus, B.P.I. 1.1, Flg.I. 1.2. Stylus short and wide. Thorax: Scutum with dark-brown integument, grayish-white pruinosity and yellowish hairs. Post pronotal lobe, notopleural lobe, post-alar callus and scutellum with yellow integument, grayish-white pruinosity and yellow pilosity. Slender legs; coxae, trochanters and femora greenish-yellow with light yellow hairs; tibiae yellowish with golden-yellow hairs, except at the apical third of the fore tibia with few black hairs; mid and hind tibiae without black hairs (if present, difficult to see, few and widely scattered); yellowish tarsomeres with golden-yellow hairs, except for the last tarsomere with black hairs dorsally; hyaline wing (Fig.10 E), except for the basal costal and costal cells that are slightly darkened. Pterostigma greenish-yellow. Veins greenish-yellow. Abdomen: Greenish-yellow covered by yellow pilosity, except at the 5, 6 and 7 tergites with few black hairs. Variations Paratypes: Body length 7.6–10.7 mm (X = 9.1 mm, N = 20); wing length 7.4–9.0 mm (X = 8.0 mm, N = 20); wing width 2.4–3.0 mm (X = 2.7 mm, N = 20); F.I. 5.6–7.2 (X = 6.2, N = 20); D.I. 1.1–1.2 (X = 1.1, N = 20); B.P.I. 1.0–1.3 (X = 1.1, N = 20), Flg.I. 1.1–1.5 (X = 1.3, N = 20). Male: (Fig. 10 F–G) body length 8.6–9.6 mm (X = 9.0 mm, N = 3); wing length 7.2–8.6 mm (X = 7.8 mm, N = 3); wing width 2.5–2.7 mm (X = 2.5 mm, N = 3). Similar to the female, except for the following: holoptic eyes (Fig. 10 H), where largest ommatidia occupy the upper 2/3 and the smallest ommatidia the lower 1/3. Ocellar tubercle absent, with a gap here. Palpus porrect, yellowish with whitish-yellow hairs and some black hairs near the apex of the second palpal segment. Antenna (Fig. 10 I) with stylus subequal to length of basal plate. B.P.I. 1.0–1.2 (X = 1.1, N = 3), Flg.I. 1.0–1.0 (X = 1.0, N = 3). Distribution: Brazil (Maranhão). Holotype Ψ: deposited at INPA, in perfect condition. Type-material: Holotype: “ Brasil (MA), Mirador\ Parque Est. Mirador\ Base da Geraldina” “Armadilha Malaise\ 22–26.viii.2006, F.\ Limeira-de-Oliveira” (Ψ INPA); 35 Paratypes. “ Brasil (MA), Mirador\ Parque Est. Mirador\ Base da Geraldina” “Armadilha Malaise \ 22–26.viii.2006, F.\ Limeira-de-Oliveira” (9Ψ INPA, 3Ψ NHM, 3Ψ FSCA, 3Ψ MPEG, 3Ψ CAS, 3Ψ CZMA); “ Brasil (MA), Mirador\ Parque Est. Mirador\ Base da Geraldina” “Armadilha Suspensa\ 11–18.ix.2006, F.\ Limeira-de-Oliveira” (1Ψ INPA); “ Brasil (MA), Mirador\ Parque Est. Mirador\ Base da Geraldina” “Armadilha Suspensa\ 18–23.ix.2006, F.\ Limeira-de- Oliveira” (1Ψ INPA); “ Brasil (MA), Mirador\ Parque Est. Mirador\ Base da Geraldina” “Armadilha Suspensa\ 23–28.ix.2006, F.\ Limeira-de-Oliveira” (3Ψ INPA); “ Brasil (MA), Caxias\ Res. Ecol. Inhamum\ Isca eqüina, 15.x. \ 2005, G. A. Cunha &\ J. J. Sousa, cols.” (2Ψ INPA); “ Brasil (MA), Caxias\ Res. Ecol. Inhamum\ Isca eqüina, 28.viii. \ 2005, G. A. Cunha &\ K. C. Santos, cols.” (2Ψ INPA); “ Brasil (MA), Caxias\ Inhamum\ Isca: cavalo” “ 16.ix.2000 \ F. L. Oliveira, col.” (1Ψ INPA); “ Brasil (MA), Caxias,\ Inhamum, 045330S\ 432453W, 14.ix.1999 ” “J. A. Rafael & F. L.\ Oliveira, Isca eqüina” (1Ψ INPA). Additional material examined: BRAZIL. MA[Maranhão]: Caxias (Inhamun, 045330S; 432453W, isca eqüina), 14.ix.1999 (J. A. Rafael & F. L. Oliveira), 8Ψ (CZMA); idem (Reserva Inhamum, isca cavalo), 16.x.2000 (F. L. Oliveira), 3Ψ (CZMA); idem (Res. Ecol. Inhamum, isca eqüina), 28.viii.2005 (G. A. Cunha & K. C. Santos), 4Ψ (CZMA); idem (Res. Ecol. Inhamum, isca eqüina), 15.x.2005 (G. A. Cunha & J. J. Sousa), 2Ψ (CZMA); idem (Res. Ecol. Inhamum, isca eqüina), 30.x.2005 (G. A. Cunha & J. J. Sousa), 1Ψ (CZMA); idem (Res. Ecol. Inhamum, isca eqüina), 02–08.xi.2005 (G. A. Cunha), 1Ψ (CZMA); idem (Res. Ecol. Inhamum, Arm. suspensa), 02–08.xi.2005 (G. A. Cunha), 1ɗ (INPA); idem (Res. Ecol. Inhamum, isca eqüina), 11–15.xi.2005 (G. A. Cunha), 1Ψ (CZMA); idem (Res. Inhamum, isca eqüina), 04.ix.2004 (J. J. Sousa & J. O. A. Silva), 3Ψ (CZMA); idem (Res. Inhamum, isca eqüina), 21–30.ix.2001 (F. L. Oliveira), 1Ψ (CZMA); idem (P. São Jorge, F. verde, isca eqüina), 1.viii.1998 (F. L. Oliveira & S. P. Silva), 1Ψ (CZMA); Mirador (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 22–26.viii.2006 (F. Limeira de Oliveira), 109Ψ (CZMA), 26Ψ (INPA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 26–31.viii.2006 (F. Limeira de Oliveira), 2Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Suspensa), 26–31.viii.2006 (F. Limeira de Oliveira), 1Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 01–06.ix.2006 (F. Limeira de Oliveira), 4Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 06–11.ix.2006 (F. Limeira de Oliveira), 2Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 11–18.ix.2006 (F. Limeira de Oliveira), 5Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Suspensa), 18–23.ix.2006 (F. Limeira de Oliveira), 1Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 18–23.ix.2006 (F. Limeira de Oliveira), 12Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Suspensa), 23–28.ix.2006 (F. Limeira de Oliveira), 7Ψ (CZMA), 1ɗ (INPA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 28.ix.–02.x.2006 (F. Limeira de Oliveira), 3Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Suspensa), 28.ix.–02.x.2006 (F. Limeira de Oliveira), 1Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 02–15.x.2006 (F. Limeira de Oliveira), 6Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Suspensa), 02–15.x.2006 (F. Limeira de Oliveira), 3Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Malaise), 15–26.x.2006 (F. Limeira de Oliveira), 6Ψ (CZMA), 1ɗ (INPA); idem (Parq.[ue] Ecol.[ógico] Mirador, isca eqüina), 12– 13.vi.1998 (F. L. Oliveira & A. B. Albuquerque), 2Ψ (CZMA); idem (Parque Est. Mirador, Base do Zé Miguel, isca eqüina), 27–28.xi.2007 (Luis Claudio), 1Ψ (CZMA); idem (Parque Est. Mirador, Base da Geraldina, Armadilha Luminosa), 08–11.iii.2008 (F. Limeira de Oliveira), 1Ψ (CZMA); Etymology: from Greek, “ Micros ” means little and “ Keras ” antenna. Discussion: This species is easily separated from C. mexicanus, C. fairchildi and C. crepuscularis due to the lack of wing spots. C. leuconotus n. sp. and C. leucochlorus have whitish and snow-white pilosity respectively, which is very different from the yellowish pilosity in this species. The narrow frons of C. microceratus n. sp. permits its separation from C. parviceps and C. ochreus, both with wide frons. The elongate basal plate in C. flagellatus and C. falsiflagellatus n. sp. separate them from C. microceratus n. sp. which has a short and high basal plate. C. inanis can be identified by its darkened wing venation at the intersections of the veins, while C. microceratus n. sp. has hyaline wings with very clear venation without darkening at the intersections.

Published as part of Krolow, Tiago Kütter & Henriques, Augusto Loureiro, 2010, Taxonomic revision of the New World genus Chlorotabanus Lutz, 1913 (Diptera: Tabanidae), pp. 1-40 in Zootaxa 2656 on pages 28-31, DOI: 10.5281/zenodo.276219