No. 64] DIPTERA OF CONNECTICUT : TAXONOMY 465 



ninibipennis group — ingloria, nimbipennis, townesi. 

 niibila group. — apicalis, crampAoniaua, innoccns, nubUa. 



The following names are omitted from the key, either because they are syno- 

 nj'ms, or else are doubtful forms unknown to the present writer. 

 abnormis Dietz=:zOxydiscus cayuga (Alex.) 

 atriceps D\etz=apicalis Alex. 

 divcrgens T)ietz'=megacera Alex. 

 parallela Doane= Identity doubtful. 

 perplexa Dietz= Identity doubtful. 

 pilosa Dietz=pygmaea Alex. 

 subcostata Dietz^Identity doubtful. 



Brief diagnoses of the doubtful species are included in order to complete the 

 report. 



Onnosia aenigmatica Dietz (Trans. Amer. Ent. Soc, 47:249; 1921), described 

 as a variety of rubella. It was described as having a beak nearly as long as the 

 thorax. An examination of the type specimen by Professor Rogers has disclosed 

 the fact that the supposed "beak" is merely an artifact and the subspecies name 

 should be placed in the synonymy of rubella. 



Ormosia parallela (Doane) (Ent. News, 19:202; 1908, as Rhypholophus). 

 Thorax reddish yellow, slightly darker above. Antennae entirely pale yellow. Hal- 

 teres yellow, the knobs at tips slightly infuscated. Abdominal tergites brownish, 

 sternites yellow. Wings rather narrow, brownish, without distinct stigma ; cell 1st 

 Ma open by atrophy of basal section of Ma ; Anal veins convergent. $ . L. 5 mm. ; 

 w. 6 mm. Ithaca, N. Y. ; known only from female specimens. 



Ormosia perplexa Dietz (Trans. Amer. Ent. Soc, 42:141; 1916). Thorax fus- 

 cous, with a grayish bloom, the praescutum with a median darker brown stripe. 

 Knob of haltere yellowish white. Wings brownish, without evident stigma; cell 

 1st Mz open by atrophy of basal section of ilfs; ni-cu before fork of M\ Anal veins 

 convergent. $ . L. 3.5 mm. ; w. 3.75 mm. Waverly, N. Y. ; a single female. 



Ormosia subcostata Dietz {Ibid., 47:249-250; 1921). Thorax grayish, with a 

 more whitish pruinosity, the median area of praescutum with a sordid yellow median 

 stripe that is bordered on either side by a narrow brown vitta. Antennae of mod- 

 erate length, light brown. Pleura reddish brown. Halteres yellow. Wings yel- 

 lowish gray, more yellowish at base; costal region appearing infuscated. due to an 

 increased density of pubescence; stigmal region darker; cell 1st Mi open by atrophy 

 of basal section of M^: Anal veins convergent. Male hypopygium with the disti- 

 styles small, blackish. $. L. 4 mm.; w. 5.5 mm. Hazleton, Pa.; Aug. 15, 1911. 



All of these species, with cell 1st M2 open by atrophy of i\h and the Anal veins 

 convergent, are evidently allied, in the present key running to couplet twenty and 

 beyond. 



Ormosia adirondacensis Alex. (Fig. 53, A). • ivr ^ 



1919. Ormosia adirondacensk Alexander; Insec. Inscit. Menst., i : 

 145-146. 



General coloration of mesonotum reddish brown, very sparsely 

 pruinose, the postnotiim and dorsal pleurites darker. Halteres pale 

 throughout. Antennae ( $ ) moderately long, if bent backward extend- 

 ing to beyond the wing-root ; flagellar segments with a dense white 

 pubescence. Male hypopygium (Fig. 53, A). $. L. about 4-5 mm.; 

 w. 4.5-5.8 mm. 2. L. about 5-5.5 mm.; w. 5-5.5 mm. 

 (June) Me., N. H., Vt., Mass., N. Y., southw. to Tenn. 

 Connecticut.-Union, June 14, 1933 (C.P.A.); Westford, June 14, 1933 (C.P.A.). 



I have interpreted the Anal veins as being divergent although vein 

 2nd A on distal quarter is deflected slightly cephalad. 



