62 AMERICAN BLACK FLIES OR BUFFALO GNATS. 



wide, surface hairs very weak and sparse; hairs on palpi brown; 

 postociilar cilia brown. Scutum with yellow, hairlike pilosity; 

 pleural tuft brown, very weak; scutellum with upright brown hairs. 

 Basal fringe of abdomen brownish-yellow, surface hairs on segments 

 brown, weak, except at apex where they become distinctly longer. 

 Legs with brownish-yellow pilosity and scattered, longer upright, 

 broAvn dorsal hairs; fore tarsi not dilated, first and third joints with 

 paired apical liairs; claws simple. Cross-vein on wing but little 

 beyond middle of subcosta ; basal hairs on wing and short bristles on 

 thick veins brown. 



Length, 2 mm. 



This species was originally described from Cuba and is represented 

 in the collection by specimens from Cayamas, Cuba (E. A. Schwarz) ; 

 La Palma, Costa Eica (Biolley) ; and Utuado, Porto Kico, marked 

 "biting flies" (C. W. Richmond). Tliere is also a large series of 

 specimens from Trinidad River and Cabima, Panama, May, 1911 

 (Busck), which agree with the Cuban specimens, except that the 

 thoracic stripes are less distinct and the specimens average rather 

 less in size and are darker in color. 



Nothing is known of the early stages of this species, and the male 

 is also unknown. 



Simulium haematopotum, new species. 



Female. — Black. Frons and face with shining pearlaceous pol- 

 linosity. Antennae yellow, browned from fourth joint to tip; palpi 

 brown, jDaler at base. Scutum velvety black, with two broad pear- 

 laceous stripes, Avhich are broader at anterior ends than the black 

 space between them, taper slightly posteriorly, but are uncurved; 

 posterior and lateral margins similarly pollinose; pleurae shining 

 black, with more or less distinct pearlaceous pollinosity; scutellum 

 brown; postscutum with pearlaceous pollinosity. Abdomen brown- 

 ish; opaque on basal four segments, each of Avhich has a rounded, 

 opaque, black dorsal, and a less distinct lateral spot, j^osterior margins 

 of these segments whitish dusted ; apical four segments with dorsal 

 portions shining; the fifth segment with a rounded dorsal spot, the 

 others almost entirely black. Legs yellow, black as follows: Mid 

 and hind coxa^; fore tarsi; apices of first four and all apical joints 

 of mid tarsi ; femora except bases, apical half of tibiae, apical halves 

 of joints 1-3, and all last two joints of tarsi of hind legs. "Wings 

 clear, basal and thick veins yellow. Halteres yellow, stalk blackened. 



Frons slightly divergent-sided, less than one-third the head 

 width at upper angle of eyes, surface hairs weak, brownish yellow; 

 face as long as frons and one-half longej* than broad, haired as frons; 

 hairs on palpi brown: postocular cilia brown. Scutum with close- 

 lying, golden-yellow, hairlike pilosity; pleural tuft brownish yellow; 



