REPORT OF THE STATE ENTOMOLOGIST I913 



IJ3 



fuscous. Mesonotum dark brown, the submedian lines thickly 

 clothed with long, gray setae. Scutellum dark brown or black with 

 numerous long, gray setae apically, postscutellum dark brown. 

 Abdomen dark brown, incisures dull red, the 

 segments margined posteriorly, especially later- 

 ally, with long, grayish white setae ; venter 

 rather thickly clothed with short, silvery setae. 

 Wings hyaline, costa dark brown. Halteres a 

 dull salmon, fuscous subapically. Legs a vari- 

 able gray, the femora and tibiae with sparse, 

 irregular dark brown markings ; tarsi dark 

 brown or black ; claws rather short, stout, 

 strongly curved, the pulvilli as long as the claws. 

 Genitalia ; basal clasp segment long, stout ; 

 terminal clasp segment swollen at the base ; 

 dorsal plate broad, deeply and triangularly in- 

 cised; ventral plate long, stout, deeply and 

 rather broadly emarginate. Harpes long, stout, 

 convolute, obliquely truncate. 



Female. Length 4 to 5 mm. Antennae ex- 

 tending to the third abdominal segment, dark 

 brown; 25-26 subsessile subcylindric segments, 

 the two terminal ones usually fused, subobtuse 

 distally. Ovipositor reddish brown ; venter 

 with the median sclerites dark brown, sparsely p h a g a 

 clothed with short, silvery hairs, the sublateral 1 o i d e s 

 areas suffused with the same. Legs somewhat (natural 

 variable yellowish or reddish brown, the fem- nal) 

 oral and tibial articulations deep red ; tarsi 



normally dark brown. Ovipositor about one-half the length of the 

 abdomen, the terminal lobe broad, tapering, narrowly rounded. 

 Otherwise nearly as in the male. Cecid. 31442. 



Fig. 17 Rhabdo- 

 s t r o b i - 

 typical gall 

 size, origi- 



Rhabdophaga brassicoides Walsh 



Willow cabbage gall 



1864 Walsh, B. D. Ent. Soc. Phila. Proc, 3 077-80 (Cecidomyia) 



1869 Packard, A. S. Guide to Study of Ins., p. 377 (Cecidomyia) 



1870 Walsh, B. D. Amer. Ent., 2 1299 (Eurytoma studiosa Say, 

 reared, Cecidomyia) 



1890 Cockerell, T. D. A. Entomologist, p. 280 (Cecidomyia) 

 1892 Beutenmueller, William. Am. Mus. Nat. Hist. Bui. 4, p. 268 

 (Cecidomyia) 



1895 Townsend, C. H. T. Can. Ent., 27:205-7 (Cecidomyia) 



1896 Marlatt, C. L. U. S. Dep't Agric, Tech. Ser. 3, p. 22 ( P t e r o n u s 

 m e n d i c u s, reared, Cecidomyia) 



1900 Smith, J. B. List Ins. N. J., p. 620 (Cecidomyia) 

 i()o6 Felt, E. P. Ins. Affect. Pk. & Wdld. Trees, N. Y. State Mus. 

 Mem. 8, 2:563, 567, 745, 746 (Cecidomyia) 



