244 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 125 



indentations. Occipital cleft very small, dome-shaped, with angular 

 apex (pi. 43, fig. 423)- 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 47-50 

 rows of hooks on its apex; postclypeal sclerites long, poorly sclero- 

 tized, wider at lateral ends, almost joining near midline. Posterior 

 sucker with 172-178 rows of hooks. Anal gills with 3 principal 

 branches, each of the lateral branches with 28 narrow, filamentous 

 extensions, the central branch with 22 extensions, giving a total of 78, 

 X-shaped sclerite with anterior and posterior arms well sclerotized, 

 the anterior arms short with a winglike, somewhat pigmented patch 

 on their posterior margin ; no rectal scales or spines. No ventral 

 papillae or sclerotized plaques on eighth segment. 



Types. — Holotype ($), pinned, and allotype {^), on 3 slides, in 

 the collection of the United States National Museum ; collected from 

 the Rio Micovez, Nebaj, Department of El Quiche, Guatemala, No- 

 vember 15, 1949. Paratypes (4 $$, 3 (^^, and 6 pupae) in the collec- 

 tion of Herbert T. Dalmat. 



SIMULIUM (HEARLEA) CAPRICORNIS De Leon 



Simulium capricornis De Leon, Bol. Sanit. Guatemala, vol. 52, pp. 71-72, figs. 

 8-9, 1944 (original description, pupal respiratory apparatus). 



Male (pi. 26, figs. 97-99). — (First description of male.) 3.0 mm. 

 long. 



Head: Holoptic. Eyes reddish brown. Antenna 600 /* long, 11- 

 segmented, slightly tapering; segment 3 = 1+2, 3>4 + 5; completely 

 black. Palpi black. Clypeus black, white-pruinose, with long black 

 hairs. 



Thorax : Velvety black, with narrow band of white pruinosity 

 around entire periphery, somewhat wider at middle of anterior mar- 

 gin ; very long, narrow, golden-yellow, scalelike hairs in wide band 

 around entire periphery, so numerous in prescutellar region that the 

 area appears golden ; few on central region ; few long black hairs in 

 prescutellar region. Humeral angles white-pruinose with yellow scale- 

 like hairs. Scutellum brown to black, with both yellow scalelike hairs 

 and erect long black hairs. Postnotum brown to black, with white 

 pruinosity. Pleura white-pruinose. Stem of halter dark brown, the 

 knob tan. Wings, 3.1 mm. long and 1.4 mm. wide; relation of length 

 of body to wing, i : i ; Sc pilose along its basal sixth ; Ri pilose and 

 spiny along distal half ; R2+3 pilose except for very short basal portion ; 

 Cu2 arcuate ; discal cell absent. 



Legs: Leg i, length, 3.3 mm.; coxa, trochanter, and femur tan; 

 outer surface of tibia with its ends black, the midregion tan; inner 



