Ceratoculicoides sp. F3 Fig. 12f Diagnosis Male Currently unknown. Female Only species of Ceratoculicoides with the following combination of characters: femora and tibiae brown, wing length ~ 1 mm; 2 major spermathecae, largest 50–55; medial margin of 9 th sternite deeply concave. Material examined COSTA RICA • 1 &female;; Puntarenas, Osa Peninsula, 4 km NW of Rincon; 11 Aug. 2001; A. Borkent leg.; CNCI • 1 &female;; same collection data as for preceding; Rio Agujas; 10–20 Aug. 1996; A. Azofeifa leg.; Malaise trap; CNCI. Description Female MEASUREMENTS (n = 2). Head width 256–306; flagellomeres 31–34, 21, 23–24, 23, 26, 24–26, 27–28, 29–31, 42–44, 46, 47–50, 43–51, 58–62; AR 1.14–1.21; FR 1.5–1.75; wing length 946–1016; wing width 371–397; costal ratio 0.63; spermathecal length 50–55; spermathecal width 46–56; spermathecal neck 8–11; spermatheca/neck ratio 0.16–0.2. THORAX. Legs with femora and tibiae brown. GENITALIA (Fig. 12f). 9 th sternite anterior branch apex broadly rounded, apices nearly touching medially; posterior branch acutely tapering at base, basal half directed posteriorly, apical half curving posteromedially, apex with small hook. 2 major spermathecae. Distribution Puntarenas (Costa Rica) (Fig. 13). Remarks Ceratoculicoides sp. F 3 can be distinguished from other Ceratoculicoides by the combination of major spermathecae being <70μm, concave posterior margin of the 9 th sternite with the posterior branch tapering in the basal half and ending in an acute point (Fig. 12f), and its flagellum ratio being>1.5. Ceratoculicoidesborkenti sp. nov. is very similar, but its flagellum ratio is <1.5. Unassociated Ceratoculicoides female specimens Material examined CANADA • 1 &female;; British Columbia, 23 km NW of Port Renfrew, Upper Carmanah Valley; 21 Jun.–3 Jul. 1991; N. Winchester leg.; CNCI • 4 &female;&female;; same collection data as for preceding; 4–15 Jul. 1991; CNCI • 2 &female;&female;; same collection data as for preceding; 31 Jul.–11 Aug. 1991; CNCI. USA • 1 &female;; Arizona, Yavapai Co., Montezuma Castle National Monument, Montezuma Well; 15–16 Jun. 1987; M.W. Sanderson leg.; FSCA • 1 &female;; California, Imperial Co., Niland, Fountain of Youth Spa and RV Park; 22–27 Mar. 1982; J.R. Elmo leg.; light trap near mud from saline thermal springs; FSCA • 1 &female;; California; Riverside Co., Philip L. Boyd Deep Canyon Desert Research Center, S. Palm Desert; 23 May 1979; S. Frommer leg.; beating fronds of Washingtonia; FSCA • 1 &female;; Idaho, Idaho Co., Clearwater National Forest, Imnamatnoon Creek; 46.5149° N, 114.7635° W; 21 May 2017; A. Fasbender leg.; AFPC • 1 &female;; Montana, Missoula Co., Lolo National Forest, Howard Creek above ponds; 46.7746° N, 114.5412° W; 4 Jul. 2018; A. Fasbender leg.; AFPC. Phylogeny The morphological phylogenetic analysis recovered one optimal tree with a score of 22 steps, presented in Fig. 14.

Published as part of Fasbender, Andrew, 2023, Revision of the New World Ceratoculicoides Wirth & Ratanaworabhan (Diptera, Ceratopogonidae, Ceratopogonini), pp. 159-202 in European Journal of Taxonomy 875 on pages 192-193, DOI: 10.5852/ejt.2023.875.2147, http://zenodo.org/record/8083773