466 COXXFXTICUT GEOL. AND XAT. HIST. SURVEY [BuU. 



O. apicalis Alex, 



1911. Ormosia apicalis Alexander; Psyche, 18 : 200-tiOl. 



1916. Ormosia atriceps Dietz; Trans. Amer. Ent. Soc, 42: 136-137. 



Figs.— Alexander, Ibid., pi. 16, fig. 6 (wing) : 1911. Dietz, Ibid., pi. 10, figs. 1-2 

 (hyp., diagramm.) ; 1916. Alexander, Cfls. N. Y., 1, pi. 34, fig. 55 (wing) ; 1919. 



Mesonotum reddish brown, the pleura darker. Head obscure 

 blackish. Antennae short. Knobs of halteres weakly inf nmed. Male 

 hypopygium with a single dististyle, oval, on mesal face set with tri- 

 angular blackened points to appear mace-like. $ . L. o-5.5 mm. ; w. 



5. .5-7 mm. 9 . L. 6.5-7.5 mm. ; w. 8-8.5 mm. 



(June. July) N. Y., N. J., Pa., southw. to S. C. and Ga. (in nits.). 



O. arcuata (Doane) (Fig. 53, B). 



190.S. Rhi/pholophus arcuatus Doane; Ent. News, 19: 201. 



Fig.— Dickinson, Cfls. Wise., p. 189, fig. 69 (wing) ; 1932. 



General coloration gray; pseudosutural foveae and tuberculate 

 pits black. Antennae dark brown throughout. Knobs of halteres 

 weakly infumed. Legs li^ht brown. Wings with m-cu shortly be- 

 yond "fork of M. Male hypopygium^ (Fig. 53, B). 6 . L. 4.5-5 mm.r 

 w. 5-6 nnn. 2 . L. 5-6 mm. ; w. 6.5-7 mm. 



(Apr. -June; Aug., Sept.) Ont., Que., N. B., Me., N. H., Mass., N. Y., Pa., westw. 

 to Wise, and Alta.. southw. to Tenn. 



O. bilineata Dietz (Fig. 53, C). 



1916. Onnosia Ulineata Dietz ; Trans. Amer. Ent. Soc, 42 ; 142-143. 



1929. O. huronis Alexander; Can. Ent., 61:20-21. 



Figs.— Dietz, Ibid., pi. 10, fig. 8 (hvp., diagramm.) ; 1916. Alexander, Can. Ent., 

 61 : 21, fig. 2 (hyp.) ; 1929. 



General coloration pale brownish gray. Antennae dark brown 

 throughout, relatively long ( 5 ) , if bent backward extendmg nearly 

 to wing-root. Halteres pale yellow. Male hypopygium (Fig. 53, C). 

 The two blackish lines on praescutum indicated by the name are poorly 

 defined or lacking. $. L. 4-5 mm.; w. 4-5.5 mm. $. L. 4.5-o.o 

 mm. ; w. 5-5.5 mm. 



(Late Apr.-June) Que., N. B., N. H., Mass., N. Y., westw. to Mich, and S. D. 

 (Black Hills), southw. to N. C. (Great Smokies). 



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



O. brevicalcarata Alex. 



1927. Omios'm hrevicalcarata Alexander; Journ. X, Y. Ent. Soc, 35: 

 61-62. 



Allied to adirondacensis, Mesonotum reddish brown, the prae- 

 scutum with a darker median line. AVings subhyaline, the stigmal re- 

 gion darker; vein 2nd A very slightly sinuous, the distal third con- 

 verging A-ery slightly toward 1st A. S. L. about 3.5-4 mm.; w. 3.3- 

 4.5 mm. 2 . L. 4-4.5 mm. ; w. 4.3-4.8 mm. 



(June, July) Pa., N. C. S. C, Tenn., southw. to nw. Fla. 



