No. 64] DIPTERA OF CONNECTICUT : TAXONOMY 333 



Key to Species 



1. Rostrum short, subequal to remainder of head; legs pale yellow, with tips 

 of femora and tibiae narrowly blackened; wings tipped with dusky, the 



stigma dark brown ' flavipes 



Rostrum about one-half longer than remainder of head; legs uniformly 

 dark brown; wings subhyaline, the stigma pale brown mainensis 



Helius {Helius) flavipes (Macq.) (Fig. 38, B). 



1855. Rhainphidia flavipes Macquart; Dipt. Exot., 5th suppl.: 17. 



Figs.— Needham, 23rd Rept. N. Y. St. Ent. for 1907, pi. 14. fig. 4 (ven.) : 1908. 

 Alexander, Proc. Acad. Nat. Sci. Philadelphia, 1916: pi. 25, fig. U (wing); 1916. 

 Alexander, Cfls. N. Y., 1, pi. 3,X fig. 42 (wing); 1919. Dickinson, Cfls. Wise, p. 

 188, fig. 66 (wing) ; 1932. 



Mesoiiotum light to dark brown ; pleura more pruinose. Rostrum 

 dark. Wings with r-in preserved or lost by fusion of adjoining veins 

 (Fig. 38, B), Abdominal segments dark brown, ringed caudally with 

 obscure yellow. $. L. 7-8 mm.; w. 7.5-8 mm. ?. L. 8-10 mm.; w. 

 7-8.5 mm. 



(May-Sept.) Ont., Que., N. H.. Vt., Alass., N. Y., N. J., Pa., westw. to Mo., 

 Kan., Man. and Alta., southw. to S. C, Ga., Fla., Ala. and Tex. 



Connecticut.— Bloomfield, Aug. 6, 1929 (C. P. A.) ; East River, Aug. 29, 1910 (Ely) : 

 Kent Falls, Sept. 11, 1929 (A. J.W.); Manitic Lake, June 8-9. 1929, Aug. 6, 1929 

 (C. P. A.); Saptree Run State Park, June 14, 1933 (C. P. A.); Storrs, Mav 1933 

 (R. H.); Tyler Lake, June 13, 1931 (C. P. A.); Union. Aug. 17, 1928 (C. F. C) ; 

 Winnipauk, June 16, 1909 (C. W.J.). 



H. {Helium) mainensis (Alex.) (Fig. 38, A). 



1916. R ha m.phidia mainensis Alexander; Proc. Acad. Xat. Sci. Phil- 

 adelphia, 1916 : 498-499. 



Figs. — Alexander, Ibid-, pi. 25, fig. 14 (wing). Alexander. Cfls. N. Y., 1, pi. 

 Z2,, fig. 43 (wing) ; 1919. Dickinson, Cfls. Wise, p. 188, fig.. 67 (wing) ; 1932. 



Mesonotum light yellowish brown, the praescutum with three 

 dark brown stripes. Head light gray, with a large brown area on 

 vertical tubercle. Abdomen dark brown, basal sternites and hypopyg- 

 ium yellowish. $ . L. 6-7.5 mm. ; w. 5.8-7.7 nun. 



(June-Sept.) Me., N. Y., and Md., westw. to 111., Mich, and Wise. 



3. Subtribe Antocharia 



Antocha Osten Sacken 



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

 1859 : 219. 



A genus of moderate size (about 35 species in the typical sub- 

 genus), most numerously developed in Eastern Asia. The adult flies 

 occur on vegetation or are found crawling on the exposed surfaces of 

 stones, always near streams. The immature stages live on the sub- 

 merged stones in such locations. The habits have been discussed by 

 the writer (Cornell Univ. Agr. Expt. Sta. Mem. 38: 800-803: 1920). 

 The coloration varies notably and can be relied upon only withm re- 



