REPORT OF THE STATE ENTOMOLOGIST I913 IO5 



Male. Length 1.5 mm. Antemiae probably nearly as long as the 

 body, fuscous yellowish; presumably 18 segments, the fifth with a 

 stem about three-quarters the length of the subcylindric basal en- 

 largement, which latter has a length fully twice its diameter. 

 Mesonotum reddish brown. Scutellum yellowish brown, postscutel- 

 lum a little darker. Abdomen a dark yellowish brown, somewhat 

 darker basally and apically. Wings hyaline, costa fuscous yel- 

 lowish. Halteres probably pale yellowish. Legs a nearly uniform 

 yellowish straw. Genitalia ; basal clasp segment long, stout ; ter- 

 minal clasp segment stout ; dorsal plate broad, deeply and tri- 

 angularly emarginate ; ventral plate long, broad, deeply and roundly 

 emarginate. Harpes long, stout, obliquely truncate, with chitinous 

 tubercles at the external angles. 



Female. Length 1.5 mm. Antennae extending to the second 

 abdominal segment, fuscous yellowish ; 18 segments, the fifth with 

 a length twice its diameter, tapering distally ; terminal segment re- 

 duced, narrowly oval. Palpi ; first segment short, stout, subquad- 

 rate, the second suboval, the third one-half longer, more slender, 

 the fourth as long as the third. Mesonotum reddish brown. Scutel- 

 lum and postscutellum fuscous yellowish. Abdomen reddish brown, 

 sparsely clothed with fuscous scales, the posterior segments thinly 

 clothed with long, yellowish setae ; ovipositor pale yellowish. Halt- 

 eres yellowish basally, fuscous apically. Legs mostly dark reddish 

 brown ; claws stout, strongly curved, the basal tooth heavy, the 

 pulvilli as long as the claws. Ovipositor two-thirds the length of 

 the abdomen, the terminal lobes slender, with a length four times 

 their width, narrowly rounded. Type Cecid. 1048. 



Rhabdophaga batatas Walsh 



Willow potato gall 



1864 Walsh, B. D. Ent. Soc. Phila. Proc, 3:601-6 (Cecidomyia) 



1870 Amer. Ent., 2 1299, 301 (Eurytoma studiosa Say 



and Decatoma nubilistigma, parasites. Cecidomyia) 



1890 Cockerell, T. D. A. Ent, p. 279-80 



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

 (Cecidomyia) 



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

 p. 22 (Nematus fur ? = Amauronematus luteotergum 

 reared from gall) 



1900 Smith, J. B. List Ins. N. J., p. 620 



1904 Beutenmueller, William. Amer. Mus. Nat. Hist. Guide Leaflet 16, 

 p. 29 



1906 Felt, E. P. Injur. & Other Ins. N. Y., 21st Rep't, p. 119-22 



1906 Ins. Affect. Prk. & \\d\d. Trees. N. Y. State Mus. 



Mem. 8, 2 745 



1908 Jarvis, T. D. Ent. Soc. Ont. 38th Rep't. p. 86 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 355 



1909 Jarvis, T. D. Ent. Soc. Ont. Bui. 39th Rep't, p. 92 

 1912 Cosens, A. Canad. Inst. Trans., 9:324-25 



IL 



