Isostenosmylus pulverulentus (Gerstaecker, 1893) (Figs. 24 – 27) Isostenosmylus pulverulentus (Gerstaecker, 1893): 166. Refs. Gerstaecker, (1893), Kimmins (1940), Penny (1977), Ardila- Camacho & Noriega (2014). Syntypes, ZIMG. Type-locality: “ Theresopolis Brasiliae”, probably state of Rio de Janeiro, Brazil. Material examined. Syntypes, Brazil: Rio de Janeiro, Theresopolis, Fruhst. Paratypes, Brazil: São Paulo, Campos do Jordão, Parque Estadual Municipal, 1549 m, 22º39’39.5”S –45º27’W, Malaise, 14.iii.2011, Airton & Cassia cols.” (1♂ MZUSP); “ Rio Casquillho, 3.4 Km P. Est. Campos do Jordão, 22º40.29’S –45º27.87’W, 1500 m, 23.ii.1998, Holzenthal, Froehlick e Paprocki cols.” (1♂ UMSP Insect Collection). Espírito Santo, Santa Teresa, Est. Ecol. Santa Lúcia, 867 m, 19°58’37.3”S – 40°32’22.5”W, Malaise, 6~ 9.iv.2001, ponto1 bosque, C. O. Azevedo e Equipe cols., Biota Fapesp” (1♀, 1♂ MZUSP). Santa Catarina, Blumenau, ii. 1885 (1♀ NHMW). Rio Grande do Sul, (2♂, 3♀ NHMW); Pelotas, 24.iii.1952, C. Biezanko col. (1♂ NHMW). Distribution (Fig. 43). Brazil (Rio de Janeiro, Espírito Santo, São Paulo, Santa Catarina, Rio Grande do Sul). New records. Additional specimens of I. pulverulentus were collected in the states of Espírito Santo and São Paulo, Brazil thus increasing the known distribution of this species. Principal characteristics. Head dark brown; vertex, frons to below antennae, and genae fuscous; edge of the clypeus with black spots; antennae pale amber, scape and pedicel brown, flagellomeres covered with elongated pale yellow setae. Pronotum testaceous with many black spots and long setae, twice as long as broad; meso- and metanota yellowish, with two black spots and elongated brown setae. Legs pale amber with some dark brown spots; covered by elongated pale amber setae. Wing membrane hyaline, veins alternating brown and pale yellow, pterostigma well-marked with a mottled coloration pattern (Fig. 24 C); forewing with many brown spots; forewing with many dark brown spots mainly in wing margin, radial and medial trace, nygmata dark brown; hindwing without dark spots. Abdomen testaceous, with many dark brown spots. Male (Fig. 25). Ninth sternite short, rounded posteroventrally; ectoproct obliquely truncated, posteroventrally with a prominent lobe rounded at apex; ninth gonocoxites with medial lobe rounded, apical margin and center excised; ninth gonapophyses shapes as quadrate plates; complex of tenth gonocoxites with basal portion fused, broad; upper branch near apex elongate, apex sharply pointed. Female (Figs. 26, 27). Seventh sternite with rounded posterior margin; fused ninth gonapophyses curved dorsad in lateral view, ventromedially with a small rounded lobe projected anteroventrally, apex with lateral rounded lobes; in ventral view Y-shaped, apical lobes anterolaterally directed, short and blunted, distal margin concave; ninth gonocoxites lanceolate with a small gonapophysis at apex and a process near to the base. Ecological notes. Specimens were collected using Malaise traps in Atlantic Forest, between 867 and 1,549 m.a.s.l.

Published as part of Martins, Caleb Califre, Ardila-Camacho, Adrian & Aspöck, Ulrike, 2016, Neotropical osmylids (Neuroptera, Osmylidae): Three new species of Isostenosmylus Krüger, 1913, new distributional records, redescriptions, checklist and key for the Neotropical species, pp. 1-66 in Zootaxa 4149 (1) on page 37, DOI: 10.11646/zootaxa.4149.1.1, http://zenodo.org/record/256806