452 KANSAS UNIVERSITY SCIENCE BULLETIN. " 



nearly as long as the width of the cell, another smaller one 

 nearly over the hind cross- vein, besides the two subparallel 

 rays in second posterior cell the large spot projects beyond the 

 fourth vein, forming an irregular border to it, the hind cross- 

 vein possesses one of the rays and the discal cell has two short 

 rays near the apex, one arising under the small cross-vein and 

 the other midway between the two cross-veins, there is a small 

 dot on fifth vein near middle of discal cell, beginning at the 

 small cross-vein and running to the stigma is a subfuscous 

 tinge which proceeds proximad, filling the base of the marginal 

 and submarginal cells, both basal cells, and the basal half of 

 the discal cell. Length, 3.8 mm. 



One specimen ; Bill Williams Fork, Arizona. Collected by 

 Dr. F. H. Snow. This species may require a new genus, yet I 

 consider it nothing but an Urellia with all the anterior rays of 

 the wing spot fused. 



Urellia occidentalis, n- sp. 



Male and female : Head and members yellow, upper part of 

 front and occiput brownish, arista and frontal bristles black, 

 those of the occiput yellow. Thorax black, gray pollinose, 

 short pile, humeri, and spot before base of wings yellow, bris- 

 tles of mesonotum and scutellum black, the latter two in num- 

 ber, halteres yellow. Abdomen black, gray pollinose, pile 

 yellow, ovipositor shining, a few pile at base. Legs reddish 

 yellow, pile and bristles yellow. Wings hyaline, the first ray 

 of the subapical spot passes to stigma and is about as wide as 

 the first posterior cell, its base surrounds the small cross-vein, 

 on each side of which, near the fourth vein, is sometimes a 

 very small hyaline dot, second ray arises half-way between the 

 second and third veins, opposite the posterior cross-vein, and 

 ends in costa opposite the mid-point between the two cross- 

 veins, a hyaline spot at apex of second vein, no ray before the 

 Y-shaped mark, base of latter one-third as wide as the first 

 posterior cell, on under side of subapical spot are five subpar- 

 allel rays, the middle, or third one, is on the hind cross-vein, 

 the last two cross the discal cell to the fifth vein, then the last 

 one borders the fifth vein to the base of discal cell, in the first 



