370 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Mount Washington. Xew Hampshire (August 1935), on Mount Marcv, 

 X. Y. (July 1938) and at high altitudes in the vicinity of Mt. Mitchell, 

 X. C. The fly has impatterned wings, much as in cuhitalis, to where 

 it would run by the use of the above key. The species differs conspicu- 

 ously in the dark brown niesonotum, without distinct praescutal 

 stripes, and especially in a noteworthy sexual dimorphism that in- 

 volves the shape and venation of the wings. The stigmal region in the 

 male sex is very large and hairy, distorting the venation of the an- 

 terior radial field, the anterior branch of the sector being chiefly 

 atrophied. The venation of the female sex is normal for the genus. 

 (Occas. Pap. Boston Soc. Xat. Hist., 8:288-291, figs. 1. 2; 1936). 



Dactylolabis cubitalis (O. S.) 



1869. Lwinophila euhifalis Osten Sacken; ]Mon. Di})t. X. Amer.. 

 4 : 229. 



Figs. — Snodgrass, Trans. Amer. Pint. Soc. 30, pi. 9, fig. 14 (hyp.) ; 1904. 

 Alexander, Cfls. N. Y., 1, pi. 40, fig. 147 (wing) : 1920. 



General coloration gray, the In-own praescutal stripes narrow and 

 relatively inconspicuous. Femora yellow to brownish yellow, the 

 outer segments of the legs darker, especially the tarsi. Wings with a 

 strong yellowish suffusion, the stigma only slightly darker ; m-cu at or 

 close to fork of 31. $ . L. 8-8.5 mm. ; w. 9-10.5 mm. 9 . L. 9-10 nnn. ; 

 w. 10-11 mm. 



(May, June) N. Y. and Ohio, westw. to Ind. and Wise, southw. to Va. and N. C. 



D. hudsonica Alex. 



1931. Dactylolabh hudsonica Alexander; Bull. Brooklvn Ent. Soc, 

 26:181-182. 



Wings with m-cu beyond the fork of J/, in most cases the distance 

 exceeding one-half the crossvein. Male hypopygium with the basi- 

 styles dark brown. $ . L. about 6.5 mm. : w. 8-8.5 mm. 9 . L. about 

 6.5-7 mm. ; w. 7.5-8 mm. 



(Late May-early July) Que., Me., N. H., Mass., southw. to N. C. and Tenn. (Hud- 

 sonian, Canadian, Transitional). 



D. montana (O. S.) (Fig. 43, D). 



1859. Lhmnophila {Dactr/lolaMs) montana Osien Sacken; Proc. Acad. 

 Xat. Sci. Philadelphia, 1859 : 240. 



Figs.— Osten Sacken, Mon. Dipt. N. Amer., 4, pi. 2. fig. 7 (ven.\ pi. 4. figs. 26, 

 26a (hyp.) ; 1869. Needham, 23rd Rept. X. Y. State Ent. for 1907, pi. 13, fig. 2 

 Twing) : 1908. Alexander. Cfls. N. Y., 1, pi. 40, fig. 148 (ven.) ; 1919. 



(jeneral coloration gray, with a sparse pollen, the four praescutal 

 stripes dark brown, very conspicuous. Male hypopygium with the 

 basistyles conspicuously pale, o . L. 6-9 mm. ; w." 8-12 mm. 9 . L. 7-8 

 mm. : w. 7-10 mm. 



The commonest and one of the most widely distributed of the 

 local species of the genus. It varies very greatly in size but only a 

 single species seems to be involved. On rockv cliffs along the south 



