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



Cylindrotoma Macquart 



1834. Cylindrotoma Macquart; Suit, a Buff on, 1, Hist., Nat. Ins., 

 Dipt., p. 107. 



A siuall oroup (ten species), distributed throughout the Holarctic 

 Region. The adult flies have the antennae (Fig. 33, B) with long, 

 nearly cylindrical flagellar segments, much longer in male than in 

 female; in male, segments clothed with a dense erect pubescence, in 

 addition to the verticils. 



The adults may be swept from swampy and boggy places in 

 woods. The larvae live on the leaves of many genera of higher 

 plants, both monocotjdedons and dicot^dedons. 



Key to Species 



1. Tarsi pale yellow, segments two and three concolorous with the basitarsus. 



americana 



Tarsi with basitarsus dark brown, its extreme apex and all of segments 

 two and three abruptly light yellow tarsalis 



Cylindrotoma americana O. S. 



1865. Cylindrotoma amencana Osten Sacken; Proc. Ent. Soc. Phila- 

 delphia, 4:236. 



Figs.— Johnson, Psyche. 19: 2, fig. 2 (ven.) ; 1912. Alexander, Cfis. N. Y., 1, 

 pi. 30, fig. 6 (wing) ; 1919. 



Pale 3^ellow, praescutum with three distinct black, stripes ; centers 

 of scutal lobes blackened; dark brown areas on ventral anepisternum 

 and ventral sternopleurite ; more or less distinct paired brown spots 

 on posterior border of mediotergite. Tarsal segments one to three 

 pale yellowish brown, the remaining segments darker brown. Vena- 

 tion variable, especially as to position of r-m and m, in cases the latter 

 before or beyond the fork of Mxj^2- Abdominal tergites chiefly yel- 

 low medially, darkened laterally. 5 . L. 10 - 12 mm. ; w. 9 - 10 mm, 



(Late June, July) Ont., Que., N. B., Me., N. H., N. Y., Pa., westw. to Mich. 

 (Hudsonian, high Canadian). 



C. tarsalis Johns. (Fig. 33, B, G). 



1912. Cyli7\drototna tarsalis Johnson; Psyche, 19:2 {$). 



1912. C'. ? anomala Johnson; Ihid., 19:2-3 (9). 



Figs. — Johnson. Ibid.. 19: 2, text-figs. 3, 4 (ven.); 1912. Alexander. Cfls. 

 N. Y., 1:850. text-fig. 125, K (ant. $), pi. 30. fig. 7 (wing); 1919. Alexander, 

 Gen. Ins., Fasc. 187, pi. 2, fig. 1 (wing) ; 1927. 



Quite as in last, differing in the conspicuous light yellow inter- 

 mediate tarsal segments, which contrast abruptly with the brownish 

 black basitarsi. The darkened spots on anepisternum and medio- 

 tergite are reduced or subobsolete; mark on sternopleurite alw^ays 

 distinct. $ . L. S - 9 mm. ; w. 7 - 9 mm. ? . li. 8 mm. ; w. 9 mm. 



(Late June-Sept.) N. B., Vt., Ct., N. Y. (Canadian). 



Connecticut.— Norfolk, June 12, 1931 (C. P. A.) ; Sept. 11, 1928, one dead in spider's 

 web (C. P. A.); Sept. 12, 1928, one male flying (G. C. C). 



