86 NEW YORK STATE MUSEUM 



triangularly incised, the lobes narrowly rounded; ventral plate stout, 

 broad, broadly rounded. Type Cecid. 179. 



Arthrocnodax acerina Felt 



1907 Felt, E. P. N. Y, State Mus. Bui. no, p. 136; separate, p. 40 

 (Cecidomyia) 



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



This yellowish brown male was taken June 7, 1906 on maple, 

 probably Acer r u b r u m , at Lake Clear, N. Y. 



Male. Length i mm. Antennae twice the length of the body, 

 thickly clothed with long hairs, dark brown; fourteen segments, the 

 fifth with stems each with a length two and one-half times its diam- 

 eter; terminal segment with the distal enlargement prolonged, the 

 apical portion subconic. Palpi; the first segment irregular, sub- 

 quadrate, the second twice the length of the preceding, oval, the 

 third about as long, narrowly oval, the fourth subequal, a little 

 stouter; face yellowish brown. Mesonotum reddish brown, prob- 

 ably with lighter submedian lines. Scutellimi reddish. Abdomen 

 yellowish brown with a distinct fuscous spot dorsally on the second 

 and third abdominal segments. Wings hyaline, costa light brown; 

 halteres whitish transparent. Legs pale straw color basally, tarsi 

 darker; claws slender, uniformly curved. Genitalia; basal clasp 

 segment long, stout, a stout, rounded lobe at the basal fourth, 

 truncate; terminal clasp segment long, swollen at the base; dorsal 

 plate broad, deeply and nan-owly incised, the lobes narrowly rounded; 

 ventral plate broad, broadly rounded. Type Cecid. 149. 



Arthrocnodax fenestra Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 404 



This light yellowish brown male was taken July 22, 1906 on a 

 window at Nassau, N. Y. 



Male. Length 2 mm. Antennae longer than the body, thickly 

 haired, light brown; fourteen segments, the fifth with stems three 

 and three and one-half times their diameters respectively; terminal 

 segment, the distal enlargement cylindric, having a length about 

 twice its diameter and a short apical process. Palpi; first segment 

 subquadrate, the second with a length three times its diameter, the 

 third a little shorter, narrowty oval, the fourth longer, dilated. 

 Mesonotum dark brown, the submedian lines indistinct. Scutellum 

 yellowish browm., postscutellum dark bro"v^'n. Abdomen a light 

 yellowish brown with the basal segment dark brown. Genitalia 

 slightty fuscous. Wings hyaline, costa light brown; halteres yel- 

 lowish white. Legs a nearly uniform straw brown; claws slender, 

 strongly cur\^ed, the pul villi shorter than the claws. Genitalia; 

 basal clasp segment long, tapering; terminal clasp segment long, 



