124 NEW YORK STATE MUSEUM 



Male. Length about i mm. Antennae one-half longer than the 

 body, sparsely haired, yellowish brown; 14 segments, the fifth with 

 stems two and one-half and two times their diameters; terminal 

 segment produced, the basal portion of the stem with a length four 

 times its diameter, the distal enlargement subglobose and separated ' 

 by a deep and narrow constriction from a broadly ovate appendage. 

 Palpi; first segment subquadrate, the second stout, with a length 

 twice its diameter, the third slender, with a length fully twice the 

 second and somewhat dilated. Mesonotiun yellowish brown. Scutel- 

 lum and postscutellum fuscous yellowish. Abdomen mostly dark 

 brown. Wings hyaline, remarkably narrow, with a length fully two 

 and one-half times the width; costa light brown, the third vein 

 uniting with the margin well beyond the apex. Halteres whitish 

 transparent. Legs fuscous yellowish, the tarsal segments darker; 

 claws rather stout, evenly curved, the pul villi longer than the claws. 

 Genitalia; basal clasp segment stout, truncate, terminal clasp seg- 

 ment rather stout; dorsal plate narrowly and triangularly emarginate, 

 the lobes obliquely truncate; ventral plate deeply and triangularly 

 emarginate, the lobes obliquely and roundly truncate. 



Female. Length i mm. Antennae nearly as long as the body, 

 sparsely haired, yellowish brown; 14 segments, the fifth with a 

 stem about one-third the length of the cylindric basal enlargement, 

 which latter has a length twice its diameter, is slightly constricted 

 near the basal third; terminal segment somewhat produced, taper- 

 ing to an obtuse, knoblike apex. Palpi nearly as in the male. Meso- 

 notum yellowish brown, the submedian lines fuscous yellowish. 

 Scutellum and postscutellum fuscous yellowish. Abdomen dark 

 brown basally, the distal segments fuscous yellowish. Wings slightly 

 broader than in the male. Ovipositor as long as the body, the distal 

 portion rather stout, the terminal lobes with a length three times their 

 diameter, tapering slightly. 



The above descriptions were drafted from cotypes kindly placed 

 at our disposal through the courtesy of Prof. V. L. Kellogg, Stanford 

 University, Cal. Represented in the state collections by Cecids. 

 767, 975 and a2i37. 



Larva. The larva is broadly elliptical, reddish yellow in color, 

 and when full grown is from i mm to 1.5 mm long. The breastbone, 

 while well chitinized in the later stages, is not visible in the newly 

 hatched. There are no nipplelike spiracles and the skin is covered 

 with fine spinules. The larva usually excretes a thick oval cocoon 

 prior to pupation. (Abstract from Snow and Mills.) 



Parasites. This species is subject to attack by several natural 

 enemies : Polygnotus diplosidis Ashm., a parasite of 

 Retinod.;inopis Osten Sacken, is an efficient parasite of this 

 species, and a mite very like Pediculoides ventricosus 

 is a valuable agent in destroying the eggs, larvae and pupae. The 

 latter attaches itself by its mouth-parts and forelegs to the larva. 



