June, '11] felt: rhopalomyia grossularle 347 



RHOPALOMYIA GROSSULARIiE n. sp. 



By E. P. Felt, Albany, N. Y. 



The form described below was reared from deformed gooseberry 

 buds, Ribes grossularia, in May, 1911, by J. S. Houser of the Ohio 

 Agricultural Experiment Station. The material was collected at 

 Camp Chase. An economic discussion of this species will be given 

 by ]\Ir. Houser. This form, in antennal characters, approaches the 

 North American Rhopalomyia tridentakc Rubs, reared from Artemisia, 

 though it is easily distinguished therefrom by the uniarticulate palpi. 



Description: Male. Length 1.8 mm. .\iitennae extending to the third abdominal 

 segment, rather thickly haired, fuscous yellowish; 16 segments, the fifth having a 

 stem with a length about one half the subcylindric basal enlargement, which latter 

 has a length one half greater than its diameter, a rather scattering subbasal whorl 

 of short setce and a thick subapical band of longer, curved setae; terminal segment 

 reduced, narrowly oval. Palpi composed of one short, incrassate segment. Mesono- 

 tum shining dark brown, the submedian lines fuscous yellowish. Scutellum yellowish 

 orange, postscutellum and the base of the first abdominal segment shining dark 

 brown. Abdomen sparsely haired, dark reddish brown; genitalia fuscous. Wings 

 hyaline, costa light straw. Halteres fuscous yellowish, somewhat reddish basally. 

 Coxae reddish brown; femora, tibiae and tarsi a fuscous straw, the distal tarsal seg- 

 ments somewhat brov\-nish; claws rather long, moderately stout, evenly curved, sim- 

 ple, the pulvilli as long as the claws. Genitalia; basal clasp segment moderately 

 long, broad; terminal clasp segment short, swollen, toothed apically; dorsal plate 

 long, broad, triangularly incised, the lobes irregularly and roundly tapering, rather 

 thickly setose; ventral plate long, moderately broad, deeply and roundly emargi- 

 nate, the lobes irregularly rounded and sparsely setose. Harpes short, stout, trun- 

 cate and with sparse subquadrate teeth posteriorly at the internal angle and the 

 external third; style moderately long, stout, subtruncate. 



Female. Length 2 mm. Antennae extending to the third abdominal segment, 

 sparsely haired, reddish brown, the distal segments reddish; 16 segments, the fifth 

 with a short stem, the subcj-lindric basal enlargement with a length one half greater 

 than its diameter, a moderately thick subbasal whorl of short setae and a subapical 

 band of longer, slender seta^; terminal segment somewhat reduced, irregular. Palpi 

 composed of one irregular, slightly swollen, thicklj' setose segment. Mesonotum 

 shining dark brown, the submedian lines sparsely haired. Scutellum a variable 

 fuscous yellowish, postscutellum dark brown. Abdomen deep red; ovipositor fuscous 

 yellowish. Halteres yellowish basally, slightly fuscous apically. 0\'ipositor when 

 extended with a length about equal to that of the abdomen, the terminal lobes with 

 a length over twice the width, narrowly rounded apically and thickh- setose; minor 

 lobes short, setose. Other characters practically as in the male. 



Type Cecid a2173, N. Y. State Museum. 



