4(0 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bllll. 



rin»i; in (laiicin<2: swarms near small streams. The inniiature stajies are 

 unknown. 



Key to St'ccirs 



1. Mesonotum pale reddish yellow, contrasting with the dark brown abdomen 

 and halteres ; wings with anal angle lacking, vein 2ud A short ; wings 



dimidiate, the base paler than apex niphadias 



Body, including mesonotum, dark brown ; wings with anal angle slightly in- 

 dicated, vein 2nd A longer; wings uniformly infumed, with a pale longi- 

 tudinal streak above vein M ursina 



T. {DasymolopMhis) niphadias (Alex.) (Fi^-. 50, K). 

 19!25. MoJophf'lm (Das/, /uo/oph !/>/.'<) nipha(]i<if< Alexander: Ent. 

 Xews, 36 : 229-230. 



Head i)rownisli testaceous. AVinns (Fiij. 50. K) indistinctH' di- 

 midiate, the basal half whitish sul)hyaline, cells beyond cord distinctly 

 infumed. i . L. 1.6 mm.: w. 2.2 mm. 



(June) Ind.. Mich., southw. to Tenn. and n. Fla. 



T. {Dasymolophilus) ursina (O. S.i) (Fi<r. 55, A). 

 1(S59. Erioptcra ursina Osten Sacken: Proc. Acad. Xat. Sci. Phil- 

 adelphia, 1859 : 228. 



Figs. — Alexander, Proc. Acad. Nat. Sci. Philadelphia, 1916, pi. 27. fig. 39 (ven.) ; 

 1916. Alexander, Cfls. N. Y., 1, pi. 34, fig. 70 (ven.) ; 1919. 



General coloration dark brown to l)lack: body conspicuously 

 clothed with lono; black setae. Male hypopytrium (Fi^. 55, A). $. 

 L. 1..S-2 nun.: w. 2.5-2.0 nun. 9. L. 2 mm.; w. 2.5 mm. 



(Late Apr.-July) Me., N. H., Vt, Mass., N. Y., Md., D. C, X. C. and Tenn. 



Connecticut.— Kent Falls, June 12-1.3, July 23-24, 1931 (C. P. A.). 



Molophilus Curtis 

 1833. Molophilus Curtis: Brit. Ent., p. 444. 



A vast genus of small or medium-sized hairy flies. The adults 

 may be swept from rank vegetation near water or be found in small 

 dancing swarms in shaded s])ots. The immature stages occur in mc^ist 

 earth. 



The local species fall in two groups, termed the plagiatus and 

 gracilis groups, respectively, that are very numerous in species in Aus- 

 tralia and Xew Zealand, with somewhat fewer members in South and 

 Middle America. Their present distrii)ution has evidently been at- 

 tained by migrations acros.s Antarctica and thence northward through 

 the Americas. 



Key to Species 

 (Based on male characters) 



1. Male hypopygium with ventral lobe of basistyle produced near apex into a 

 small sclerotized beak ; both dististyles lying in notch of basistyle, widely 

 separated by membrane: mesal lobe of basistyle not developed; outer disti- 

 style deeply bifid {plagiatus group) (Fig. 55, C, F, I, M) 2 



