40 AMERICAN BLACK FLIES OR BUFFALO GNATS. 



brown, apical segments with sparse, dark surface hairs. Legs with 

 pale yellow hairlike pilosity and a few longer, upright, broAvn dorsal 

 hairs, the normal paired apical hairs present on first and third joints 

 of fore tarsi; fore tarsi slender, hind tarsi with apical four joints 

 three-fourths as long as basal joint; tarsal claws simple. Hairs at 

 base of first vein black, surface hairs on veins black, anal wing fringe 

 wdiitish. 



Length, 1.5-2 mm. 



Four females, Sarare, Venezuela (T. Gray), examined by Ecu- 

 baud; four females taken on board ship 4 miles off Livingston, 

 Guatemala, March 20, 1906, one female, Cacao, Trece Aguas, Guate- 

 mala, and one female, same locality, April 12, 1906, labeled " Biting 

 man " ( Schwarz and Barber) . 



This very prettily marked species can not be confounded with any 

 other which I have examined. 



The male and the early stages are unknown. 



* Simulium clavipes, new species. 



Female. — Black, subopaque. Frons and face distinctly white- 

 dusted ; antennae brown, the basal two and base of third joints yellow ; 

 palpi brown, pale at base. Scutum in some specimens with faint 

 indications of a central stripe and anteriorly with slight whitish pol- 

 linosity ; scutum shining posteriorly, prescutum yellow ; pleurae brown, 

 darker anteriorly and with whitish pollinosity; scutellum and post- 

 scutum brown, the latter with white pollinosity. Abdomen black, 

 opaque on basal four segments, glossy on apical four. Legs yellow, 

 black on mid and hind coxce, apices of all tibiae, and entire tarsi, ex- 

 cept base of first joint of mid tarsi, and greater part of first and basal 

 half of second joint of hind tarsi. AYings clear, thick veins brown. 

 Halteres yellow. 



Frons slightly divergent-sided, three-fourths as wide at lower angle 

 as at upper, surface hairs brown, sparse, upright; face subquadrate, 

 as broad as frons at lower angles and similarly haired ; hairs on palpi 

 brown; postocular cilia brownish black, strong. Scutum with golden 

 yellow pilosity which is rather loose and irregularly arranged, though 

 not grouped; besides the pile there are regularly arranged brown 

 hairs over the entire disk, which are much more distinct on margins 

 and especially posteriorly; pleural tuft brown, sparse; scutellum with 

 yellow decumbent pilosity and long, upright brown hairs. Basal 

 fringe of abdomen yellow, surface hairs on apical segments pale 

 brown, sparse. Legs strong, clothed with yellow pilosity, and with 

 numerous longer, upright, dorsal brown hairs which are more notice- 

 able on tibise and tarsi; fore tarsi broad, first and third joints with 

 paired apical hairs; hind tarsi with basal joint narrower than tibiae, 



