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. Bul. 110, p. 136; separate, p. 40 
(Cecidomyia) 
TOOS Wise 

— N. Y. State Mus. Bul. 124, p. 404 
This yellowish brown male was taken June 7, 1906 on maple; 
probably Acer rubrum, at Lake Clear, N.Y. 
Male. Length 1 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. Scutellum 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 narrowly incised, the lobes narrowly rounded; 
ventral plate broad, broadly rounded. Type Cecid. 149. 
Arthrocnodax fenestra [Felt 
1908 Felt, E.P. N. Y. State Mus. Bul. 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, narrowly oval, the fourth longer, dilated. 
Mesonotum dark brown, the submedian lines indistinct. Scutellum 
yellowish brown, postscutellum dark brown. Abdomen a light 
yellowish brown with the basal segment dark brown. Genitalia 
slightly fuscous. Wings hyaline, costa light brown; halteres yel- 
lowish white. Legs a nearly uniform straw brown; claws slender, 
strongly curved, the pulvilli shorter than the claws. Genitalia; 
basal clasp segment long, tapering; terminal clasp segment long, 
