SIMULIUM. 41 



apical four joints about two-thirds as long as basal joint; tarsal claws 

 as shown in Plate II, figure 5. 



Length, 3— i mm. 



Tijpe. — Cat. No. 15411, U. S. National Museum. 



Locality. — Guadeloupe, West Indies, 4,000- foot level, July (August 

 Busck). 



It is improbable that this is the species described as 8. tarsale by 

 Williston, the description of which is given on pages 4G-47. The size, 

 color, and locality are quite enough to justify me in separating it, 

 even if the vestiture were overlooked by Williston in describing his 

 species in so far as the presence of the upright brown hairs on scutum 

 are concerned. 



The early stages of this species are unknown, and there are no males 

 among the material in the collection. 



Simulium jenningsi, now species. 



Female. — Black, shining. Frons and face shining, the former 

 slightly, the latter distinctly white-dusted; antenna? brown, basal 

 three joints paler, yellowish; palpi brow^n. Scutum shining black, 

 with distinct pearlaceous pollinosity, which does not form 

 spots, but is most distinct near margins of prescutum and tapers 

 off toward center of disk; pleurae glossy black, distinctly whitish 

 pollinose on lower central portions ; scutellum velvety opaque black ; 

 postscutum whitish pollinose. Abdomen with basal four segments 

 opaque black, apical four glossy black. Legs black, yellow as 

 follows: Coxae, bases of femora narrowly, and at bases of tibiae 

 broadly of fore legs; trochanters, bases of femora, bases of tibiae 

 broadly, and basal three tarsal joints except apices, on mid and hmd 

 logs. All tibiae silvered on basal half of dorsal surface. Wings 

 clear, basal portions of veins browm, thick veins yellow. Halteres 

 with lemon-yellow knob and brown stalk. 



Frons broad, distinctly more than one-third as wide at upper 

 angle of eyes as head width, slightly divergent-sided, hairs sparse, 

 pale, confined to lateral posterior margins; face slightl}' narrower 

 than frons at widest part, about one-third longer than wide and as 

 long as frons, surface hairs pale, sparse, though more numerous than 

 on frons; hairs on palpi pale; postocular cilia brown. Scutum with 

 yellow, sparse, rather widely placed, regular hairlike pilosity, no 

 long posterior hairs on scutum ; pleural tuft sparse, short, brownish ; 

 pogtspiracular area bare; scutellum with upright brown hairs. Basal 

 abdominal fringe brownish yellow, surface hairs on apical four seg- 

 ments sparse, yellowish. Pilosity on legs yellow, except on the basal 

 half of dorsal surfaces of tibia^ where it is white, giving the silvery 

 appearance which is so noticeable in this and allied species; the 



