258 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



Occipital cleft dome-shaped, the apex with short, tubelike extension 

 (pi. 43, fig. 426). 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 40-42 

 rows of hooks at its apex; postclypeal sclerites distinct, but poorly 

 sclerotized, long and broad, almost meeting at the midline. Posterior 

 sucker with 184 rows of spines. Anal gills with 3 principal divisions 

 with a fleshy base ; each division with 24-25 slender fingerlike pro- 

 jections, giving a total of usually 74 projections. Anterior and poste- 

 rior arms of X-shaped sclerite well sclerotized, the anterior arms with 

 winglike expansions that are more extensive on their outer margin; 

 minute spines, or their bases, between the anterior and posterior arm 

 of each side and a group of about 20 short black spines between the 

 anterior arms ; 3 rows of simple rectal spines. No ventral papillae or 

 plaques on eighth segment. 



Types. — Holotype ($), on 5 slides, and allotype (J*), mounted on 

 pins, one wing on slide ; collected from the Rio Samala, Totonicapan, 

 Department of Totonicapan, Guatemala, on February 24, 1949. Para- 

 types (8 $$, 4 cfj*, and 24 pupae). Holotype and one (^ paratype 

 (pinned) in the collection of the United States National Museum; 

 the allotype and all other paratypes in the collection of Herbert T. 

 Dalmat. 



SIMULIUM (HEARLEA) ETHELAE Dalmat 



Simulium (Hearlea) ethelae Dalmat, Ann. Ent. Soc. Amer., vol. 43, No. i, pp. 

 143-148, figs. 8-14, 1950(b) (original description, d* genitalia and legs, ?, and 

 pupa). — Dalmat, ibid., vol. 44, No. i, pp. 52-53, 1951 (male). 



Male (pi. 27, figs. 106-108). — 4.0 mm. long. 



Head: Eyes very dark reddish brown. Antenna 600 [x. long, 11- 

 segmented, slender, tapering; segment 3<i4-2, 3>44-5<ii, 3>ii; 

 scape and pedicel brown, the flagellum black. Palpi black. Clypeus 

 dark brown, white-pruinose, irregularly covered with long, strong 

 hairs. 



Thorax : Mesonotum velvety black, with band of white pruinosity 

 on its periphery, interrupted only on the anterior margin where the 

 ends of both arms are directed somewhat posteriorly; long, yellow, 

 scalelike hairs completely covering the mesonotum, denser on the an- 

 terior third and longer on prescutellar region; scalelike hairs never 

 in packets ; few short, black hairs along anterior margin, longer on 

 prescutellar region. Humeral angles brown, with white pruinosity. 

 Scutellum black, with white pruinosity, several yellow scalelike hairs, 

 and with very long black hairs. Postnotum black, white-pruinose, 

 with a group of yellow scalelike hairs forming a compact cluster near 



