84 NEW YORK STATE MUSEUM 



Arthrocnodax sylvestris Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 143; separate, p. 47 

 (Cecidomyia) 



1908 N. Y. State Mus. Bui. 124, p. 403 



The dark carmine male was taken September 26, 1906, at David" 

 son's River, N. C. 



Male. Length 1.25 mm. Antennae one-fourth longer than the 

 body, thickly haired, brown; fourteen segments, the fifth with st ms 

 two and one-half and four times their diameters, respectively. Palpi; 

 the first segment short, swollen distally, the second, third and fourth 

 subequal, the latter more slender than the preceding. Mesonotum 

 a \'ariable yellowish and brown, submedian lines indistinct. Scu- 

 tellum and postscutellum yellowish. Abdomen dark carmine, a 

 fuscous spot near the middle. Wings hyaline, costa brown; halteres 

 a semitransparent salmon; femora and tibiae pale fuscous distally, 

 tarsi fuscous; claws rather slender, strongly curved. Genitalia; 

 basal clasp segment stout, swollen; terminal clasp segment enlarged 

 basally; dorsal plate short, broad, lobes broadly rounded; ventral 

 plate long, slender, broadly rounded. Type Cecid. ai63o. 



Arthrocnodax rufa Felt 

 1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 403 



This dark reddish male was taken July 24, 1906, on hickory, 

 Carya, at Albany, N. Y. 



Male. Length 2 mm. Antennae one-fourth longer than the body, 

 thickly haired, fuscous yellowish; fourteen segments, the fifth with 

 stems two and one-half and three times their diameters, respectively. 

 Palpi; first segment siibquadrate, the second narrowly oval, with a 

 length three times its diameter, the third as long as the second, 

 more slender, the fourth a little longer than the third. Mesonotimi 

 dark brown. Scutellum dark reddish brown, postscutellum reddish 

 yellow. Abdomen dark reddish, the second and third abdominal 

 segments darker; genitalia fuscous yellowish. Wings hyaline, costa 

 light brown; halteres semitransparent. Anterior legs nearly uniform 

 dark brown, the mid and posterior legs mostly pale straw, claws 

 slender, evenly curved, the pulvilli shorter than the claws. Geni- 

 talia; basal clasp segment long, slender ; terminal clasp segment long; 

 dorsal plate long, deeply and triangularly emarginate, the lobes 

 narrowly rounded; ventral plate long, broad, broadly rounded. 

 Harpes indistinct. Type Cecid. 678. 



Arthrocnodax filicis Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 136; separate, p. 35 

 (Cecidomyia) 



1908 N. Y. State Mus. Bui. 124, p. 404 



This yellowish brown male was taken June 4, 1906, on fern at 

 Karner, N. Y. It was also taken in a trap lantern at Nassau, N. Y. 

 July 9th. 



