OF WASHINGTON, VOLUME XVII, 1915 161 



notum with short, rather closely placed hairs, the surface without distinct 

 punctures; scutellum convex, short, rounded in outline, two long apical 

 and two shorter subapical bristles on margin. Abdomen shorter than 

 head and thorax combined. Legs rather long and moderately stout; sen- 

 sory area of hind tibiae not darker than surrounding portions. Penulti- 

 mate section of fourth wing-vein twice as long as basal portion of third ami 

 distinctly, but not greatly, shorter than ultimate portion of fifth. Length, 

 2 mm. 



* 



Type locality: Mahomet, 111., August 6, 1914 (J. R. Mallocln. 

 Gaurax splendidus n. sp. 



Male. Yellow, variegated with black. Head yellow; frons orange- 

 yellow, opaque, triangle glossy, the upper margin blackened, vertex and 

 occiput black; face, antenna: and arista reddish yellow: palpi pale yel- 

 low. Mesonotum honey-yellow, with the following black marks, a nar- 

 row line on anterior margin, a small spot behind each humerus, and a 

 broad dorso-central stripe which does not extend to anterior margin and 

 is connected with a lateral tridentate mark on posterior margin, the outer 

 portion of the latter being indistinctly connected with a spot on lateral 

 margin at suture; anterior to the black lateral spot at suture is a large 

 milk-white spot on each side; pleura- blackened on upper half except one or 

 two small portions where the yellow ground-color shows; scutellum lemon- 

 yellow; surface hairs on thorax silvery white, scutellar hairs and bristles 

 yellow. Abdomen black, yellow at base and on a narrow dorso-central 

 line on second segment; venter greenish yellow; hypopygium black. Legs 

 whitish yellow, blackened on apical half of anterior and postero-ventral 

 surfaces of mid femora, apical half of posterior femora, with the except ion 

 of a narrow portion which divides the black mark, and the mid and hind 

 tibise, except their bases and apices. Wings clear at extreme base, posterior 

 to fifth vein up to cross vein and beyond that point posterior to fourth 

 vein, the remainder black with the exception of a very narrow clear line 

 along posterior margin of fourth vein from base to cross vein. Halteres 

 yellow, knob black. 



Head, viewed from above, twice as broad as long at, center; frons more 

 than one-third the head-width and distinctly broader than long, triangle 

 extending more than midway to anterior margin; post-vertical bristles 

 long, cruciate; surface of frons with a few hairs, a cruciate pair noticeable 

 on center of anterior margin; antenna' normal in size, third joint, very 

 densely pilose, arista swollen at base, the hairs sparse and very distinct; 

 cheek linear, with numerous hairs; eyes distinctly higher than long, surface 

 hairs distinct. .Mesonotum with silvery hairs which are most conspicuous 

 when viewed from in front; scutellum with two long, cruciate apical 

 bristles, and two much shorter ones which are not exactly on the margin 

 but a short distance from it, on the disc. Abdomen tapering; hypopy- 

 gium very conspicuous, recurved beneath abdomen, each of the lateral 



