REPORT OF THE STATE ENTOMOLOGIST I913 III 



Rhabdophaga rhodoides Walsh 



1864 Walsh, B. D. Ent. Soc. Phila. Proc, 5 .-586-88 



1867 Ent. Soc. Phila. Proc, 6:224 



1896 Marlatt, C. L. U. S. Dep't Agric, Div. Ent.. Tech. Ser. 3, p. 22 

 (Nematus inquilinus reared from gall) 



1906 Felt, E. P. Ins. Affect. Prk & Wdld. Trees. N. Y. State Mus. 

 Mem. 8. 2 745 



This rather large, loose gall on willow, Salix, appears to be the 

 work of a western or central species, since we have it only froin 

 Illinois and Aweme, Manitoba. 



Gall. The midges undoubtedly winter in the gall. Specimens of 

 this gall in the Museum of Comparative Zoology at Cambridge, 

 Mass., show that the head is much looser than is the case with 

 the gall produced by R. s t r o b i 1 o i d e s and that the distal third 

 of the central leaves is free, while most of the basal leaves are 

 entirely so. The gall is smaller and the aborted leaves shorter and 

 more compact than they are in the deformity produced by Rhab- 

 dophaga coryloides. 



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

 reddish brown ; 25 segments, the fifth with a stem about one-half 

 the length of the basal enlargement, which latter has a length twice 

 its diameter ; terminal segment fused with the preceding. Palpi ; 

 first segment with a length about three times its diameter, the second 

 twice the length of the first, the third a little longer than the second, 

 more slender, the fourth about as long as the second, slender. 

 Mesonotum dark brown, submedian lines sparsely haired. Scutel- 

 lum reddish brown, postscutellum yellowish brown. Abdomen 

 rather thickly haired, dark reddish brown. Wings hyaline, costa 

 dark brown. Halteres brownish basally, yellowish white apically. 

 Coxae dark brown ; femora, tibiae and tarsi yellowish brown, the 

 distal segments somewhat darker ; claws stout, strongly curved, the 

 pulvilli longer than the claws. Genitalia ; basal clasp segment long, 

 slender, terminal clasp segment long ; dorsal plate long, deeply and 

 triangularly incised ; ventral plate long, deeply and triangularly 

 emarginate. Harpes long, broadly rounded. 



Female. Length 5 mm. Antennae extending to the second abdo- 

 minal segment, reddish brown ; 29 sessile segments, the fifth with 

 a length about twice its diameter ; terminal segment tapering distally 

 and slightly fused with the preceding. Palpi ; first segment with 

 a length about two and one-half times its diameter, the second a 

 little longer, the third one-half longer than the second, more slender, 

 the fourth about as long as the third, slightly dilated. Ovipositor 

 about one-quarter the length of the abdomen, terminal lobes with 

 a length about two and one-half times the diameter, narrowly 

 rounded. Cecid. 1247. 



