1 88 



NEW YORK STATE MUSEUM 



Male. Length 2 mm. Antennae dark brown, basally yellowish, 

 silvery scales ventrally; 25 segments, the fifth with a length about 

 three-fourths the diameter; terminal segments somewhat produced, 

 narrowly oboyate. Palpi yellowish, fuscous apically, the first , seg- 

 ment short, broadly oval, the second a little longer, rather stout, 

 the third longer and more slender than the second, the fourth fully 

 one -half longer than the third, more slender. Face thickly clothed 

 with silvery scales. Mesonotum dark brown or black, broadly mar- 

 gined laterally and anteriorly with silvery white scales, the submedian 

 lines faintly indicated by a few silvery scales. 

 Scutellum dark brown, with a few silvery setae api- 

 cally, postscutellum dark brown. Abdomen dark 

 brown, the basal segment thickly clothed dorsally 

 with silvery white scales, the second narrowly mar- 

 gined posteriorly on the median line and the third 

 rather broadly and the fourth narrowly margined 

 with silvery white scales, the bands on the two 

 latter obsolete distally, eighth and sometimes the 

 seventh segment fuscous yellowish ; genitalia fuscous ; 

 venter black with a broad median white stripe. 

 Wings hyaline, costa dark brown, the third vein 

 uniting with the white discal spot near the basal 

 half. Halteres pale silvery yellowish. Legs with 

 the extremities of femora, the distal extremity of 

 tibiae and the first tarsal segment a variable silvery 

 yellowish, the other portions of the legs dark brown, 

 tarsi slightly darker; claws rather long, slender, 

 strongly curved, the pul villi hardly as long as the 

 claws. Genitalia; basal clasp segment long, slender, 

 the obtusely rounded terminal clasp segment some- 

 what swollen basally. Dorsal plate broad, tapering, 

 deeply and triangularly incised; ventral plate long, 

 tapering, broadly rounded. Harpes long, slender, 

 tapering, obtuse. 



Female. Length 2 mm. Antennae dark brown, 

 yellowish white basally; 27 segments, the fifth with 

 a length hardly half its diameter ; terminal segment 

 produced, obpyriform. Palpi; yellowish white, 

 slightly fuscous apically, the first segment quadrate, 

 the second a little longer, narrowly oval, the third 

 about as long and more slender than the second, the fourth one- 

 half longer than the third. Ovipositor pale yellowish; venter black, 

 with a broad median stripe of silvery white scales. Wings hyaline, 

 costa dark purple, the third vein uniting with the small, white discal 

 spot near the basal third. Femora and tibiae dark brown, narrowly 

 annulate with yellowish and white at the extremities; tarsi dark 

 brown. Ovipositor as long as the abdomen, terminal lobes very 

 long, slender, narrowly rounded. Type Cecid. ai423- 



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Fig. 34 Neo- 

 1 a s iop ter a 

 corn icola , 

 swellings on 

 larger cornus 

 twigs (origi- 

 nal) 



