130 NEW YORK STATE MUSEUM 



Male. Length 1.5 mm. Antennae extending to the base of the 

 abdomen, sparsely haired, grayish brown, the two basal segments 

 whitish; probably 16 or 17 segments, the fifth with a length one- 

 fourth greater than its diameter. Palpi; the first segment irregu- 

 larly quadrate, the second one-half longer, broader, the third a little 

 longer and more slender than the second, the fourth one-fourth 

 longer than the third, somewhat dilated. Mesonotum reddish brown, 

 sparsely haired. Scutellum fuscous yellowish, postscutellum yellow- 

 ish brown. Abdomen mostly yellowish with a variable salmon tinge 

 and very sparsely clothed with dark brown scales. Costa dark brown, 

 the small stigmatal spot at the basal half; halteres whitish trans- 

 parent. Coxae reddish orange; femora mostly whitish transparent, 

 with sparse, fuscous scales apically; tibiae sparsely clothed with 

 dark brown scales, the posterior thickly so apically, the anterior and 

 midtarsi dark brown, the segments narrowly annulated basally with 

 whitish, the posterior tarsi with the first segment white, the base of 

 the second and third broadly annulate with white, the fourth and 

 fifth white; claws unusually long, slender, the pul villi nearly as long 

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

 stout ; terminal clasp segment long, greatly swollen basally; dorsal 

 plate short, broad, triangularly emarginate; ventral plate long, 

 deeply and roundly emarginate, the lobes rather slender and nar- 

 rowly rounded. 



Female. Length 2 mm. Antennae reddish brown, the two basal 

 segments whitish; 16 or 17 segments, the fifth with a length about 

 equal to its diameter, the terminal segment reduced. Scutellum 

 yellowish brown, postscutellum reddish brown. Abdomen dark 

 brown with submedian, triangular spots posteriorly on each segment 

 and laterally a series of irregular similar spots. Halteres yellowish 

 white. Ovipositor as long as the body, yellowish orange; terminal 

 lobes slender, with a length six times the width and sparsely 

 setose. Other characters as in the male. Type Cecid. a27i6, Web- 

 ster 11,-838. 



Lasioptera willistoni Ckll. 



1898 Cockerell, T. D. A. Ann. & Mag. Nat. Hist., ser. 7, 2:327 



This species, according to notes kindly placed at our disposal by 

 Professor Cockerell, was taken on the college campus, Mesilla Park, 

 New Mexico, December 19, 1899, at which time the immature 

 larvae were extremely minute. The -insect was reared by Professor 

 Cockerell from an irregular twig swelling onAtriplexcanescens. 

 This species is tentatively assigned this position together with the 

 two others described by Professor Cockerell in comparison with 

 this form. 



Gall. Length 1.5 mm, diameter 5 mm, a somewhat irregular twig 

 swelling, tapering at both extremities and with one exit hole. 

 Described from a specimen kindly sent by Professor Cockerell. 



Larva. Length 6.5 mm, orange color, rather stout. Head small, 

 triangular; antennae small, posterior extremity broadly rounded; 

 breastbone dark, slender, minutely bidentate and in the mounted 



