446 KANSAS UNIVERSITY SCIENCE BULLETIN. 



upper half ; first and second joints of antennae of equal length, 

 third two and a half times as long as both together, in certain 

 lights third is of a brownish color, palpi linear, yellow at tip, 

 knob of halteres pure white, knees and basal half of tarsi yel- 

 lowish, all tibiae in certain lights brownish ; wings hyaline, 

 veins brown, width of apex of first posterior cell but little less 

 than the length of the small cross-vein. 



Female : Agrees with the male, except the palpi are very 

 much enlarged at apex, clavate, tip brownish yellow, and none 

 of the abdominal segments have white posterior borders. 

 Length, 2.5 mm. 



A specimen of each sex ; Bill Williams Fork, Arizona. Col- 

 lected by Dr. F. H. Snow. 



Nausigaster scutellaris, n. ep. 



Male : Black, whitish pollinose and punctulate as in N. 

 jmnctulata Will., short pile of whole body white; occiput, 

 vertex, front, face except tip of tubercle, white pollinose, the 

 lower half of the face reddish brown, mouth-parts retracted, 

 brownish, antennae yellow, base of arista brownish yellow. 

 Dorsum of thorax with five subshining, bare, longitudinal 

 vittEe, which in certain lights are bronze, the central one is 

 straight, the two lateral ones converge and join posteriorly ; 

 pleurtp uniformly pollinose and punctulate ; scutellum sub- 

 shining, red, except extreme lateral angles and minute tubercles 

 on posterior margin, which are black ; halteres yellowish white. 

 Venter and apex of abdomen with a reddish cast, dorsum with 

 five broad, indistinctly defined, subshining vittae, which in 

 certain lights are bronze, the small concave space on base of 

 second segment whitish pollinose, the pollen on either side of 

 the median vittae arranged in crescentric spots, with the con- 

 cavity toward the median line, the fourth segment possessing 

 two pairs of such spots. Legs black, extreme apex of femora, 

 tibiae and tarsi yellowish, a subapical band on hind tibiae, and 

 hind metatarsi brown, claws black. Wings hyaline, with a 

 very minute brown spot at apex of auxiliary vein, spurious 

 vein scarcely perceptible beyond the small cross-vein, first 

 posterior cell closed a very short distance from the wing mar- 

 gin, last section of fourth vein without stump on anterior side, 



