102 NEW YORK STATE MUSEUM 



Rhabdophaga populi Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 112. Sep. p. 16 



1908 N. Y. State Mus. Bui. 124, p. 354, 355 



This dark brown species was reared at Albany, N. Y., May 25, 

 1909 from cocoons taken at the base of poplar, Populus 

 tremuloides, buds collected at Karner, N. Y. The midge 

 winters in the cocoon, appearing in early spring. A species of 

 Polygnotus was reared from this gall. 



Cocoon. Oval, whitish, about 2 mm long. 



Male. Length 2 mm. Antennae extending nearly to the tip of 

 the abdomen, sooty yellowish; 18 segments, the fifth with a stem 

 one-third the length of the basal enlargement; terminal segment 

 reduced, suboval. Palpi ; first segment broad, subrectangular, sec- 

 ond a little more slender, longer, the third one-half longer than the 

 second, more slender, the fourth one-fourth longer than the third, 

 fusiform and more slender; face dark brown, narrowly margined 

 with silvery white; mesonotum dark brown, with submedian lines 

 of silvery white hairs and groups of the same at the base of the 

 wing. Scutellum dark brown, postscutellum reddish brown. Ab- 

 domen dark brown, thinly clothed dorsally and thickly so laterally 

 with silvery hairs. Wings hyaline, costa and subcosta light brown, 

 tinged with reddish near the apex. Halteres reddish transparent 

 at base, yellowish red apically. Legs nearly uniform brown dorsally, 

 silvery ventrally ; tarsi possibly a little darker; claws stout, uni- 

 formly curved. Genitalia; basal clasp segment stout; terminal 

 clasp segment swollen at the basal fourth ; dorsal plate broad, deeply 

 emarginate ; ventral plate broad, deeply incised. Harpes subtri- 

 angular, tapering, obtuse, with a minor chitinous lobe bearing a 

 long, slender, obtuse tooth. See plate 5, figure 1 and plate 7, figure 

 2, for illustrations of the wing and genitalia respectively. 



Female. Length 2.5 mm. Antennae extending to the base of the 

 abdomen, yellowish brown; 18 segments, the fifth subsessile, the 

 enlargement having a length one-half greater than its diameter ; 

 terminal segment reduced, subovoid. Palpi ; first segment stout, 

 subquadrate, second one-half longer, subrectrangular, the third 

 more slender and one-fourth longer than the preceding, the fourth 

 one-half longer than the third, more slender ; face yellowish brown, 

 margined posteriorly with silvery gray hairs. Abdomen dark brown, 

 incisures dark reddish, the segments fringed posteriorly with silvery 

 hairs and the sides rather thickly clothed with the same. Ovipositor 

 about one-third the length of the abdomen, the terminal lobes long, 

 narrowly rounded. Type Cecid. a322. 



