47-2 CONNECTICUT GEOL. AXD NAT. HIST. SURVEY [Bul]. 



{Fig. 54.1)). 6. L. 3.5-5 mm.: w. 4-() mm. 9. L. 5-5.5 mm.; w. 

 5.5-6 mm. 



(Aug.-micl-Sept.) Que., Out., X. B., Ale., N. H., \'t., Mass., Ct., N. Y., Pa., westw. 

 to Mich., .southw. to N. C. 



Connecticut.— Cornwall Bridge, Aug. 19. 1931 (C. P. A.); E. Hartland, Sept. 11, 1928 

 (C. P. A.): East River. Sept. 1910 (Elv); Kent Falls, Aug. 19, 1931 (C. P. A.) ; 

 Norfolk, Sept. 6, 1928 (G. C. C); Salisbury, Sept. 5, 1928 (G. C. C), Sept. 12, 1928 

 (C. P. A.); Twin Lakes. Sept. 12, 1928 (C P. A.); W. Granby, Sept. 11, 1928 

 (C. P. A.) : Winsted, Sept. .S, 1928 (G. C. C). 



O. nigripila ( O. 8. ) ( Fig. 54. E ) . 



1N()1>. /ih//p/io/o/>hus nigiip'/his ( ).st(Mi Sackeii: Mon. Dipt. X. Amer., 

 4: 142-14:1 



Figs.— Needham, 23rd Kept. N. Y. St. Ent. for 1907, pi. 21, f^g. 4 (ven.) : 1908. 

 Alexander, Cfls. X. Y., 1, pi. 34, fig. 57 (wing) : 1919. 



General coloration dark brown, gray pruinose. Male hypopygium 

 (P'ig. 54, E) ; gonapophyses ajipearing as slender simple rods, curved 

 to the acute tips. i. L. 3.5-4 nun.: w. 4-5 mm. 9. L. about 4.5-5 

 mm.; w. 5 mm. 



(May. June; Sept.) Ct., Pa., D. C, \'a., westw. to Ind. and Mich., southw. to S. C. 

 and Fla. 



Connecticut.— Granbv, June 8, 1929 (C. P. A.); Middletown, May 31, 1929 (R.C.N.) 

 (at liglit) : Riverton. May 30, 1931 (C. P. A.). 



0. nimbipennis Alex. (P'ig. 54, F). 



1!>17. Orinosht nhnhipennis Alexander: ("an. Ent., 49 : 24-ii5. 



Figs.— Alexander, Cfls. N. Y., 1, pi. 34, fig. 59 (wing) : 1919. Alexander, Can. 

 Ent., 61:21, fig. 4 (hyp.) : 1929. 



^Nle.sonotal praescutum reddish brown to dark gray; remainder of 

 thorax gray to dark grayish brown. Halteres pale yellow. AVings 

 with a strong tlusky tinge, the stignui .still darker. Male hypopygium 

 (Fig. 54, F) usually brighter than remainder of abdomen. $. L. 4-5 

 nun. : w. 4.5-6 nun. 9 . L. 5 mm. ; w. 5-6 mm. 



(July-Sept.) N. B., Me., N. H., Vt., Mass., Ct., N. Y., westw. to Mich. 



Connecticut.— Cornwall Bridge, Aug. 19, 1931 (C. P. A.); W. Granby, Sept. 11, 1928 

 (C. P. A.). 



O. notmanl Alex. (Fig. 54, (i). 



l'.»2(t. Onnos'ui notinaiii Alexander: Can. Ent., 52:225. 



(reneral eoloration gray. Antennae relatively short, black 

 throughout. Knobs of halteres light yellow. Wings tinged with gra}', 

 the stigmal region more infumed: vein .ind A feebly sinuous near ex- 

 treme tip but Anal veins decidedly divergent. Male hypopygium 

 (Fig. 54, (j). The peculiar structure of the outer dististyle is ap- 

 proached by O. cornnta (Doane) and O. suhcornuta Alex., of western 

 North America. 6. L. 3.5-3.8 mm.; w. 4-4.5 mm. ?. L. 4 mm.; w. 

 4 mm. 



(May. June) Ont., Que., Mass., Ct., N. Y. 

 Connecticut.— Riverton, May 16, 1931 (C. P. A.). 



