Xo. 64] DIFTERA OF COXXECTICIT : TAXoNuMV 431 



Black, Avith stronolv darkened winos. A\'iiiirs with hasal section 

 of /?5 short to very short, in approximate alitrnnient with lis. 6. L. 

 (i-8 mm.: w. 5.5-8 mm. 9. 7.5-8 mm.; w. fi-T nnn. 



(June-Aug. ) Que., Ont., Mc, N. H., A't., Mas.s., R. I. and N. Y., wcstw. to la., 

 Kan. and Tex., southw. to S. C, Ga., ?la. and Ala. 



Connecticut— New Haven, July 20, 1929 (W. It. B.) ; Riverton, June 8, 1929 (C. P. 

 A.) : W. Granby, June 8, 1929 (C P.A.). 



Lipsothrix Loew 



1873. Lipsothrix Loew: Beschreib. Em\ Dipt., 3:09. 



A small <>enus, including twelve described recent specie.-^, wide- 

 spread throughout the Holarctic Region. A single species in eastern 

 Xorth America. The adults frequent the vicinity of streams, often 

 near small waterfalls. The immature stages are unknown. 



Lipsothrix sylvia (Alex.) (Fig. 47.1); 51, A). 



1916. LimnopkUa si/lria Alexander; Proc. Acad. N^at. Sci. Phihidel- 

 phia, 1916:534-535. 



Figs. — Alexander, Ihid., pi. 27, fig. 46 (wing) ; 1916. .Mexander. Cfl.s. X. Y., 

 1, pi. 40, fig. 157 (wing) ; 1919. 



Mesonotum above dark brown, the sides of thorax paling to ob- 

 scure yellow. AVings (Fig. 47, D) with a faint brownish tinge, the 

 stigma poorly indicated; ^1+2 and R2 subequal; basal section ^5 

 strongly arcuated or angulated; m-cu not far from fork of M. Male 

 hypopygiuni (Fig. 51, A) wdth the interbasal structures appearing as 

 conspicuous blackened rods that narrow abruptly into a terminal 

 spine. $ . L. 5-6 mm. ; w. 5.5-7 mm. 2 . L. 6-7.5 mm. ; w. 6.5-8 mm. 



(June-Aug.) Me., N. H., Vt., Mass., N. Y., southw. to N. C, S. C. and Tenn. 



Connecticut.— Hartland, June 9, 1929 (C. P. A.); Kent Falls, June 12-13 1931 

 (C. P. A.): Katchaug State Fore.st. June 14, 1933 (C. P.A.); Union. June 14. 19.W 

 (C.P.A.). 



Teucholabis Osten Sacken 



1859. Teucholabis Osten Sacken; Proc. Acad. Nat. Sci. Philadelphia, 

 1859 : 222. 



An extensive, essentially tropical genus, with few species in the 

 local fauna. The immature stages occur in decaying wood. 



The various species have the notum highly polished, the pleura 

 often with a silvery pruinosity. The general appearance is thus quite 

 different from the allied genus Gonoviyia. The males of most species 

 of Teucholabis have a curious pocket of setae on the seventh abdommal 

 sternite. 



Key to Species 



1. Sc long, Sci ending far beyond midlength of Rs (Fig. 47, E) - 



Sc short, Sci ending slightly beyond origin of Rs • • • • • ■ • 



2. Mesonotal praescutum with three black stripes; male hypopygium wi li tlu 



spine of the basistyle very small; outer dist.style smiple ; '-^^'^leagvi^^^^^^ 

 with terminal spine very short 



