130 NEW YORK STATE MUSEUM 



1892 Theobald, F. V. Acct. Brit. Flies, p. 51, 87 

 1895 Kieffer, J. J. Soc. Ent. Fr. Bull. p. 319 



1897 Syn. Cecid. Eur. & Alg., p. 52 



1900 Soc. Ent. Fr. Ann. 69:438, 443 ( F u r c i n.e r v a ) 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 308^9 

 191 1 N. Y. Ent. Soc. Jour., 19:31 



The species referable to this genus are easily recognized by costa 

 being continuous and extending beyond the tip of the third vein, 

 which latter unites with the margin at the apex of the wing. The 

 fourth vein is forked, the cell usually being much shorter than in 

 Lestremia. The antennae differ greatly from those of Lestremia, 

 being in the male of C. a m e r i c a n a (figure 17) distinctly bino- 

 dose, while in the case ofC. slossonae the segments are long, 

 slender and distinctly stemmed. There are 16 antennal segments 

 in the two known American species. Type C. 1 a t i p e s Haiid. 

 Europeans forms are recorded as having 14 to 16 antennal seg- 

 ments in the male and 10 to 12 segments in the female. The geni- 

 talia of our American species are of a quite different type from 

 that found in Lestremia. 



Nothing is known concerning the life history of American forms. 

 Kieffer states that the larvae of the European C. muscicola 

 Kieff. occur on mosses. It is probable that these forms are sylvan 

 as in the case of Lestremia and allied genera. Our species are 

 doubtless boreal in habitat. 



Key to species 



a Length 4 mm; antennae binodose, terminal clasp segment long, ap- 



pendiculate basally americana Felt, C. 929 



aa Length 4 mm, antennae uninodose, terminal clasp segment short 



b a r b e r i n. sp. 

 aaa Length 1.5 mm; antennae uninodose slossonae Felt, C. 931 



Catocha americana Felt 

 1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 309 



This species, received for study through the courtesy of the 

 United State National Museum, was taken at Franconia, N. H., by 

 that well-known collector, Mrs A. T. Slosson. 



Male. Length 4 mm. Antennae nearly as long as the body, 

 thickly haired, dark brown; 16 segments, the third with the basal 

 enlargement somewhat produced, the fourth and following, each 

 slightly binodose, the basal subcylindric enlargement with a 

 length nearly four times its diameter (figure 17). Palpi; the first 



