i8o 



NEW YORK STATE MUSEUM 



Male. Length 1.25 mm. Antennae a little longer than the body, 

 rather thickly haired, dark brown, usually 16, occasionally 15 or 

 17 segments, the fifth with a stem as long as the cylindric basal 

 enlargement, which latter has a length three-quarters greater than 

 its diameter ; terminal segment narrowly oval, subacute. Palpi ; 

 the first segment irregular, the second subrectangular, with a length 

 nearly three times its diameter, the third one-half longer, more 

 slender, the fourth longer than the third, more slender. Mesono- 

 tum shining reddish brown, the submedian lines sparsely haired. 

 Scutellum fuscous yellowish, postscutellum darker. Abdomen 

 sparsely haired, dark brown ; genitalia fuscous yellowish. Wings 

 hyaline, costa dark brown. Halteres yellowish basally, fuscous api- 

 cally. Coxae light brown ; femora and tibiae mostly dark brown, 

 the tarsi nearly black ; claws slender, strongly curved, the pulvilli as 

 long as the claws. Genitalia ; dorsal plate long, broad, broadly and 

 triangularly incised, the divergent lobes narrowly rounded apically 

 ventral plate long, broad, deeply and broadly emarginate, the lobes 

 long, tapering, irregularly. Harpes short, stout. 



Female. Length 1.5 mm. 

 Antennae extending to the 

 third abdominal segment, 

 sparsely haired, light brown, 

 yellowish basally; 15-16 sub- 

 cylindric, sessile segments, the 

 fifth with a length two and 

 one-half times its diameter, 

 terminal segment reduced, 

 sometimes slightly fused with 

 the preceding. Mesonotum 

 dark brown, the submedian 

 lines thickly clothed with yel- 

 lowish hairs, the anterior lat- 

 eral angles and base of the 

 wings yellow haired. Scutel- 

 lum fuscous yellowish, with a 

 few coarse setae apically, post- 

 scutellum yellowish. Abdo- 

 men deep red, the dorsal 

 sclerites sparsely clothed with 

 dark brown scales, the latter 

 thicker on the posterior mar- 

 gin. Ovipositor slightly fuscous basally, yellowish apically. Hal- 

 teres pale yellowish orange, somewhat fuscous subapically. Coxae 

 apically and femora basally yellowish or whitish yellow, the distal 

 portion of femora, tibiae and tarsi dark brown or nearly black. 

 Ovipositor as long as the body, the terminal lobes with a length 

 about four times the width, narrowly rounded apically. Other 

 characters as in the male. Cecid, ai442a. 



Fig. 20 Galls of Dasyneura com 

 munis (natural size, original) 



