234 NEW YORK STATE MUSEUM 
Male. Length .65 mm. Antennae a little longer than the body, very 
thickly haired, light brown; fourteen segments, the fifth with stems 
each three times their diameter; terminal segment, distal enlarge- 
ment subcylindric, with a length about three times its diameter and 
tapering strongly at the distal fourth to a narrowly rounded apex. 
Palpi; the first segment short, stout, irregularly subquadrate, the 
second narrowly oval, with a length nearly three times its diameter, 
the third one-half longer and more slender than the second. Meso- 
notum fuscous yellowish. Scutellum dull yellowish, postscutellum 
and abdomen fuscous yellowish, the latter sparsely haired. Wings 
hyaline, costa yellowish brown; halteres semitransparent basally, 
slightly fuscous apically. Legs mostly a pale straw yellow, the 
tarsi brown, the distal segments darker; claws long, slender, strongly 
curved, the pulvilli nearly as long as the claws. Genitalia; basal 
clasp segment long, slender, an inconspicuous lobe at the basal third; 
terminal clasp segment long; dorsal plate short, broad, deeply and 
narrowly incised, the lobes narrowly rounded; ventral plate long, 
broad, broadly rounded. Harpes expanded, convolute and with 
long, closely-set teeth on the posterior margin; style indistinct. 
This specimen appears abnormal in that one basal clasp segment 
apparently bears two terminal clasp segments, the apical portion 
of the second being closely fused with the proximal third of the 
basal clasp segment. Possibly it is a malformed style. Type 
Cecid. 718. 
ADIPLOsIS Felt 
1908 Felt, E.P. N.Y. State Mus. Bul. 124, p. 405 
1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:287 
1911 Felt, E.P. N. Y. Ent. Soc. Jour., 19:61—62 
1913 Kieffer, J. J. Gen. Insect., fasc. 152, p. 203 
The genus is easily distinguished from Odontodiplosis 
Felt, to which it is closely related, by the stouter basal clasp segment 
without a basal lobe and the total absence of teeth on the ventral 
plates or harpes. 
Type and sole species, Cecidomyia toxicodendri 
Felt, ©. 263" 
Adiplosis toxicodendri Felt 
1907 Felt, E. P. N. Y. State Mus. Bul. 110, p. 137; separate, p. 40-41 
(Cecidomyia) 
LGGS UN eotate Mus: Bul. n24. 405 
The fuscous brown midge was taken June 14, 1906 on poison ivy, 
Rhus toxicodendron, at Nassau, N. Y. 
Male. Length .75 mm. Antennae about one-half longer than 
the body, thickly haired, light brown; fourteen segments, the fifth 
(fig. 52a) with stems each three times their diameter; terminal seg- 
ment, distal enlargement somewhat produced, subcylindric, slightly 
swollen distally and with a fusiform terminal appendage nearly as 
