296 COXNECTICUT GEOL. AXD XAT. HIST. SURVEY [Bull. 



Mesonotum and pleura chiefly polished black, the dorso-pleural 

 membrane conspicuously j^ellow. A'enation (Fig:. 33, H) with r-m 

 sometimes preserved, more often shortened and lost by fusion of ad- 

 joinin<r veins. (5 . L. 9 - 12 mm.; w. 8-8.5 mm. 2. L. 10-11 mm.; 

 w. 9-9.5 mm. 



(Late May -early July) Ont., Que., N. B., Me., N. H., Vt., Mass., N. Y., N. J., 

 Pa., westvv. to 111., Wise, and Alta. 



Connecticut.— Cornwall Bridge, June 13, 1931 (C. P. A.) ; Granby, June 8, 1929 

 (C. P.A.); Hamden, June 2, 1928 (R. B. F.); Hartland, June 9, 1929 (C. P.A.): 

 Kent Falls, May 31. 1931. June 12-13, 1931 (C. P. A.) ; Manitic Lake, June 8-9, 1929 

 (C. P.A.); Norfolk, June 9, 1929 (C. P. A.); Riverton, June 12, 1931 (C. P. A.); 

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



L. nodicornis flaveola Alex. 



1919. Liogma nodicornis fla/veola Alexander; Can. Ent., 51:195. 



Mesonotal praescutum and scutal lobes black; scutellum, medio- 

 tergite, except at posterior margin, and pleura, except areas on 

 anepisternum and ventral sternopleurite, light yellow. $ . L. 11-12 mm.; 

 w. 8.3-8.5 mm. 9 . L. 11 mm.; w. 9 mm. 



(May-early June) D. C, Va., N. C, Ind., Tenn. (more southern than typical form). 



Triogma Schiner 



1863. Triogma Schiner; Wien. Ent. Monatschr., 7:223. 



Only four species are known, almost evenly distributed through- 

 out the Holarctic Region (Europe, Japan, eastern North America). 

 The local species frequents open' boggy meadows, where there is little 

 or no shade, the sluggish adults resting on the vegetation. The lar^^ae 

 occur on subaquatic and aquatic mosses in this habitat. The local 

 species is readily told by the small size, uniform brown coloration and 

 entirely opaque, rugulose body. 



Triogma exculpta O. S. (Fig. 33, D, I). 



1865. Triogma exculpta Osten Sacken; Proc. Ent. Soc. Philadelphia, 

 4 : 2^39. 



Figs. — Alexander, Gen. Ins., Fasc. 187, pi. 1, fig. 7 (ant. $); pi. 2, fig. 11 

 (wing) ; 1927. 



General coloration dull brown. Terminal segment of flagellum 

 shorter than the penultimate (Fig. 33, D). Praescutal stripes and 

 centers of scutal lobes impunctate. Degree of fusion of A'4+5 with 

 il/1+2 variable (Fig. 33, I), in very rare cases with r-m distinct. 

 5 . L. 8-9 mm.; w. 6-7.5 mm. 2 . L. 8.5 -9 mm.: w. 6.5 - 7.5 mm. 



(Late Apr.-mid-June) N. H., Mass., Ct., N. J., Pa., westw. to Mich. 



Connecticut.— Norfolk, June 9, 1929 (C. P. A.); Stamford, May 15, 1932 (B. T. 

 R. L.). 



