468 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bllll. 



O. carolinensis Alex. (Fig. 53, D). 



1925. Onnosia caTolinensis Alexander; Ent. News, 36:229. 



Belongs to the meigenii group: most closely allied to serridens, 

 differing chiefly in h3''popygial characters (Fig. 53, D). S. L. about 

 2.6-2.8 mm. ; w. 4.2-4.4 mm. 



(March) N. C, S. C. 



It is possible that this fly represents only a race of serri/lens. 



O. cramptoniana Alex. 



1929. Ormosia crann'ptoniana Alexander ; Can. Ent., 61 : 249. 



Allied to nubila. General coloration dark gray. Antennae dark 

 brown throughout. Wings with cell 1st M^ relatively small; m-cu 

 shortly before fork of MT $. L. about 6 mm.; w. 6-6.5 mm. 5. L. 

 about 7.5 mm. : w. T.6 x 2.8 mm. 



(Late June, early July) Que. (Gaspe). 



O. dentif era Alex. (Fig. 53, E). 



1919. Ormosia dentif era Alexander; Insec. Inscit. Menst., 7:144-145. 



(ieneral coloration clear gray. Antennae ( S ) black throughout ; 

 flagellar segments fusiform, with outspreading setae. Halteres pale. 

 Wings with stigma not or but slightly indicated. Hypopygium bright 

 yellow (Fig. 53, E). S. L. 3-3.8 mm.; w. 3.5-4.3 mm. S. L. 3.8-4 

 mm. ; w. 4.5-4.6 mm. 



(May-mid-June) Que., N. B., Me., N. H., Vt., Mass., Ct., N. Y. 



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



O. f ernaldi Alex. (Fig. 53, F) . 



1924. 07'77iosia f ernaldi Alexander; Occas. Pap. Boston Soc. Nat. 

 Hist., 5 : 116-117. 



General coloration brownish gray, the pleura clear gray. Knobs 

 of halteres yellowish. Wings tinged with gray, the stigma vaguely 

 more inf uscated ; Anal veins converging at outer ends. Male hypopyg- 

 ium (Fig. 53, F). $. L. about 3.2 mm.; w. 4 mm. ?. L. 3.5 mm.; 

 w. 4-4.5 mm. 



(May) Mass. 



O. frisoni Alex. (Fig. 53, G). 



1920. Ormosia fiisoni Alexander; Can. Ent., 52:224-225. 



Belongs to the meigenii group ; closest to meigenii, from which it 

 is most readily told by the structure of the male hypopygium (Fig. 

 53, G). $. L. 3-3.5 mm.; w. 4-4.5 mm. ?. L. 3.8-4 mm.; w. 4-4.8 

 mm. 



(May) Ind., 111., Mich., la. 



O. gaspensis Alex. 



1929. Oi^nosia gasyensis Alexander ; Can. Ent., 61 : 249-250. 



