No, 64) DIPTERA OF CONNECTICUT: TAXONOMY 309 



S. C.) ; TylcT Lake. June 13, 1931 (C. P. A.) ; Waterburv, June 9 1905 (W E B ) • 

 W. Hartford. June 10. 1929 (R. B. R); Westford. June 14. 1933 ^C P A)'- W 

 Granby. June 8. 1929- (C. P. A.) ; Willington. June 24. 1932 (X. T.) ; Winstcd 'lune 

 10, 1928 (R. B. F.). ^ ■ ■ 



E. solatrix (O. S.) 



1859. Limnophila {Epiphraf/ma) soJatrir Ostcn Sackeii : Proe. Acad. 

 Nat. Sci. Philadelphia, 1859 : 288. 



Figs.— Osten Sacken. Mon. Dipt. N. Amer.. 4. pi. 2. fig. 8 (wing) • 1869 Alex- 

 ander, Cfls. N. Y., 1. pi. 41, fig. 159 (wing) ; 1919. 



General coloration brown, whiti.^h pruinose. the mesoiiotal i)rae- 

 scntiim more reddish brown in front. $. L. 8-10 mm.: w. s-ll mm. 

 $ . L. about 10 nnn. : w. 11-12 mm. 



(May-Aug.) N. Y. (Long Island), Aid. and \"a.. westw. to Tenn.. Ind. and Mo., 

 southw. to Fla. and La. 



3. Snbtribe Dactylolabaria 



Dactylolabis Osten Sacken 



1859. Dactyl olahk Osten Sacken: Proc. Acad. Nat. Sci. Philadelphia. 

 1859 : 240. 



The <renus Dactyl olahis belongs to the more oeneralized Hexato- 

 mini, havino: the anterior arcnhis lackinof. The various species are 

 eminently lithophilous, frequenting the vertical faces of shaded cliffs 

 and rock exposures. The larvae live in algal growth amid percolating 

 water in these situations, wdiile the adult flies are to be found resting 

 on the walls and in crannies of the rock surface. Of the local species, 

 the adult flies of cvhHalis and hudsonica are less restricted to the 

 lithophilous habitat, being more commonly swept from i-ank vegeta- 

 tion in ravines and gorges. 



Key to Species 



1. Wings unmarked, except for the vaguely defined stigma cubitalis 



Wings yellowish subhyaline, with a heavy spotted brownish gray pattern, 



this including clouds beyond the arculus. at origin of Rs. fork of Sc. alon.g 

 cord and outer end of cell 1st Mj, fork of Ru:<*t, the stigma and fork of 

 M... , 2 



2. Wings tending to be degenerate, more or less reduced in size : costal fringe 



and scanty trichia of veins reduced to short spinous bristles: Arctic 



species rhicnoptiloides 



Wings of normal size; costal fringe and abundant trichia of veins long and 

 hair-like : not Arctic species • 3 



3. A supernumerary crossvein in cell Rs. King opposite or just proximad of Rj 



supernumeraria 



No supernumerary crossveins in any cells of wing 4 



4. Femora dark brown, the tips not paler ; mesonotal praescutum yellowish gray. 



with four clearly delimited dark brown stripes (Fig. 43, D) montana 



Femora brown, the extreme tips paling to yellowish: mesonotal praescutum 

 yellowish pollinose. the stripes darker but ill-defined, especially the laterals 



hudsonica 



Following the completion of the present report, a reuiarkable 

 new species of Dactyl olahis {pemetica Alexander) was discovered on 

 Mount Desert. Maine (June 1935). and later at high altitudes on 



