96 American Midland Naturalist Monograph No. 3 



a true basal lobe, but a modification of the interbasal fold) ; apical lobe absent. 

 Dististyle (Ds) nearly as long as basistyle and consisting of a short, stout 

 stem and a greatly enlarged, apical head; head about one and one-fourth times 

 as long as stem and consisting of a large, quadrate inner lobe and a slender 

 hook-like outer filament, both of which arise from the base of a larger, median, 

 cone-shaped portion bearing three mesally directed teeth at apex. 



LARVA. (Fig. 47). — Head nearly as long as broad. Antenna small, about 

 one-third as long as head, smooth; antennal tuft represented by a single hair 

 inserted on outer third and extending beyond tip of antenna. Head hairs: 

 Preantennal (A) single, short; lower (B) single, extending beyond preclypeus; 

 upper (C) single, short; postclypeal (d) single, about as long as lorver (B), 

 inserted near anterior margin of clypeus; sutural (e) small, single; trans- 

 sutural (f) double or triple; supraorbital single or double. Upper lateral ab- 

 dominal hairs long, 2 or more branched on segments I to VI. Comb of eighth 

 segment of numerous scales, variable in number, in a single row, the scales 

 becoming progressively somewhat smaller ventrally; individual scale somewhat 

 variable in shape, usually elongate and evenly fringed with small delicate 

 spinules, those on apex somewhat stronger. Siphon about four to five times as 

 long as basal width, with long single hairs on all aspects; pecten absent; dorsal 

 preapical spine stout, about as long as apical width of siphon. Anal segment 

 about as wide as long; incompletely ringed by the dorsal plate; lateral hair 

 very long, 2 to 3 -branched; dorsal brush consisting of a long 2-branched upper 

 and lower caudal tuft on either side; a ventro-lateral tuft of 2 to 3 branches 

 on either side; gills 4, bulbous, ventral pair as long or longer than the segment, 

 dorsal pair much reduced, about one-third the size of the ventral pair. 



DISTRIBUTION. — Southern Canada and Eastern United States, south to 

 South Carolina and Alabama. Southern States: Alabama, North Carolina, 

 South Carolina (52). Other States: Connecticut (90); District of Columbia 

 and Illinois (52); Maine (90); Maryland and Massachusetts (52); Michigan 

 {88); Minnesota (131); New Hampshire, New Jersey and New York (52); 

 Rhode Island (99) ; Wisconsin (48). 



BIONOMICS. — The female of this species is not knov/n to bite humans. The 

 larvae occur in the leaves of the pitcher plant, Sarracenia purpurea. The larvae 

 may be found during any season of the year, even in winter, and are able to 

 withstand freezing and thawing, as the water in the leaves of the plant freezes 

 and thaws during the winter. The eggs are usually deposited by the female in 

 the younger leaves before water collects in them; however, they may be depos- 

 ited on the sides of older leaves above the water level. 



Wyeomyia (Wyeomyia) vanduzeei Dyar and Knab 



Wyeomy'ia vanduzeei Dyar and Knab, 1906, Proc. Biol. Soc. Wash., 19:138. 

 WyeorrT^ia {IV^eomvia) vanduzeei Lane and Cerqueira, 1942, Arq. de Zool., 3:550 

 (synonymy given). 



ADULT female. — Very small species. Head: Proboscis long, black; palpi 

 very short, dark. Occiput clothed dorsally with dark broad flat scales with 

 metallic blue green reflection; the vertex with broad silvery-white scales. Scales 

 of gena broad, appressed, silvery-white. Thorax: Anterior pronotal lobe, 

 posterior pronotum, pleurae and coxae covered with broad appressed silvery- 



