234 NEW YORK STATE MUSEUM 



Male. Length .65 mm. Antemiae 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 pul villi 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, dosely-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. Bui. 124, p. 405 



1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:287 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19:61-62 

 1913 Kieflfer, 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 

 Pelt, C. 263. 



Adiplosis toxicodendri Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 137; separate, p. 40-41 

 (Cecidomyia) 



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



