42 Annals Entomological Society of America [Vol, VI, 



on the fifth not as distinct as on the other segments, and that on the 

 first widest; halters, tegulae, and their long cilia yellowish white. Hairs 

 and bristles of the cox^ black, except the short hairs on the front coxae 

 which are yellow and easily overlooked; the front and middle metatarsi 

 about three-fourths as long as their tibiae; tips of the tarsi infuscated; 

 first and second joints of the hind tarsi equal. Wings grayish hyaline; 

 fourth vein ends in the apex of the wing, the tip widely separated from 

 the tip of the third vein; veins brown. 



Described from two females taken at Moro Lake, Cal., 

 July 23, 1911, by Prof. J. M. Aldrich. 



14 Neurigona disjuncta n. sp. 



Figure 14. 



Thorax and abdomen yellow, the latter sometimes with black 

 bands; hypopygium yellow, appendages testaceous; front tarsi plane, 

 with the fourth joint nearly two-thirds as long as the third; tip of the 

 wing infuscated. Length, 4^-6 mm. 



Male: Face rather wide for a male, and with the sides nearly par- 

 allel, only a very little wider below; face and palpi with silvery white 

 pollen; antennae yellow, arista brown; front and occiput black, thickly 

 white pollenose; orbital cilia and post-vertical bristles white. Thorax 

 yellow, somewhat shining on the dorsum, but dulled with white pollen: 

 humeri and pleura? pale yellow, and covered with white pollen; pleurae 

 with the usual black spot in front of the halters; scutellum and metano- 

 tum yellow; the flattened space before the scutellum sometimes slightly 

 infuscated. Abdomen yellow with black or brown lateral spots on the 

 dorsum of the second, third, and fourth segments, these spots sometimes 

 united into bands on the third and fourth segments ; venter yellow, with 

 a black transverse ridge on the third segment. This ridge is ciliate with 

 long whitish hairs, hairs on the venter yellowish white, those on the 

 tergum mostly black; fifth segment short, and with the ventral sheath 

 black and polished. Legs pale yellow; front coxa? with short yellow 

 hairs on the front side, and large black bristles near the tip; middle 

 coxas with black hairs and bristles near the tip ; front and middle meta- 

 tarsi about as long as their tibia? ; front tarsi infuscated from the extreme 

 tip of the first joint; fourth joint of front tarsi nearly two-thirds as long 

 as third; middle and hind tarsi growing darker from the base to the 

 tip, second joint of hind tarsi longer than the first. Wings grayish 

 hyaline, with the apex more or less infuscated; third and fourth veins 

 widely separated at tips; fourth vein ending slightly back of the apex 

 of the wing. 



Female : Agrees with the male in most characters, except the sexual 

 difference, but the abdomen may lack the lateral spots; and the wings 

 are not infuscated at apex, but somewhat tinged with yellow along the 

 front. 



Described from five males, and nine females, from Vt,, 

 N. Y., and Canada. I have taken them from the vicinity of 

 Buffalo, N. Y., and also at Toronto, and Ridgeway, Ont.; 



