114 NEW YORK STATE MUSEUM 



1908 Jarvis, T. D. Ent. Soc. Ont., 38th Rep't, p. 87 



1909 Ent. Soc. Ont., 39th Rep't, p. 91 



1910 Stebbins, F. A. Springf. Mus. Nat. Hist. Bui. 2, p. 11 



This small, close apical gall on willow is very common in New 

 York State. The larvae inhabit a large central cell and transform 

 to adults in early spring. The male has 23 antennal segments, the 

 fifth with a stem three-quarters the length of the basal enlargement. 

 The female has 24 antennal segments, the fifth with a length about 

 one-quarter greater than its diameter. 



Gall. Length and diameter approximately 1 to 2 cm. This is 

 a close, apical gall and is composed of a series of broad, appressed 

 rudimentary leaves. 



Male. Length 3.5 mm. Antennae nearly as long as the body, 

 light brown fuscous basally, 23 segments, the fifth with a stem 

 about three-fourths the length of the basal enlargement, which 

 latter has a length slightly greater than its diameter ; terminal seg- 

 ment frequently somewhat reduced and partially fused with the 

 preceding. Palpi ; first segment rather short, slightly swollen dis- 

 tally, with a length fully twice its diameter, the second cylindric, 

 one-half longer than the first, the third as long as the second, and 

 the fourth a little longer than the third, all nearly equal in size, 

 thickly clothed with narrow scales and sparsely so with stout setae ; 

 face fuscous, sparsely clothed with yellowish setae, obscurely 

 margined posteriorly with fine, yellowish hairs. Mesonotum dark 

 brown, the submedian lines and lateral margins thickly clothed with 

 rather long, spreading yellowish setae. Scutellum a deep red with 

 numerous yellowish setae apically, postcutellum darker. Abdomen 

 dark brown, rather thickly and uniformly clothed with yellowish 

 setae. Genitalia slightly darker. Wings hyaline, costa dark brown. 

 Halteres yellowish basally, fuscous yellowish apically, dark brown 

 subapically. Legs a fuscous yellowish basally, the tarsi mostly 

 dark brown ; claws long, stout, strongly curved, the puvilli longer 

 than the claws. Genitalia ; basal clasp segment long, stout ; terminal 

 clasp segment long, slender; dorsal plate broad, deeply and rather 

 broadly incised ; ventral plate long, broad, deeply and triangularly 

 emarginate. Harpes long, narrow, obtuse, apically a heavy, broad, 

 subquadrate, chitinous process. 



Female. Length 4 mm. Antennae extending to the third ab- 

 dominal segment, dark brown ; 24 segments, the fifth cylindric, sub- 

 sessile, with a length about one-fourth greater than its diameter, 

 the last segment prolonged. Scutellum dark brown with numerous 

 pale yellowish setae apically, postscutellum a reddish brown. Ab- 

 domen dark brown, the segments margined posteriorly with rather 

 long, whitish hairs, most abundant laterally, incisures deep red, 

 venter sparsely suffused with silvery white scales, yellowish red, 

 the median sclerites dark brown. Ovipositor about one-half the 

 length of the abdomen, the terminal lobes long, stout, broadly 

 rounded. Otherwise nearly as in the male. Cecid. ai433. 



