160 KANSAS UNIVERSITY SCIENCE BULLETIN. 



The legs, so far as present, are light yellow. Wings hyaline, 

 costa reaches almost to the middle of the wing, distinctly 

 ciliated, third vein forked, tip of first vein ends at aboufc two- 

 thirds the distance between the humeral and tip of third vein, 

 fifth and sixth veins divergent apically. Length, 1.2 mm. 

 April. 



SYRPHID^. 

 Melanostoma. 



(Schiner, Wiener Ent. Monatschr., IV, 213; 1860.) 



Melanostoma bituberculata, n. sp. 



Male and female: Head black, mostly shining; eyes, in 

 male, \vith large facets above ; front of female with cross band 

 of gray pollen ; face sparsely gray pollinose, with two small, 

 but distinct, tubercles in center ; cheeks and occiput grayish 

 pollinose ; halteres yellow. Abdomen brownish black ; anten- 

 nae yellow, apex of third joint blackish above, arista yellow ; 

 mouth-parts brownish black. Thorax black, shining, pile 

 short and light ; sides of mesonotum and pleurse lightly gray 

 pollinose ; first segment immaculate, second with an ovate yel- 

 low spot on each side, attaining the lateral margin at the ante- 

 rior third of the segment, but not in contact with either 

 anterior or posterior margins ; third and fourth segments each 

 with a pair of rather long spots which are broadly in contact 

 with the anterior margin, and also with the lateral margin at 

 the anterior angle ; fifth segment with a pair of short but simi- 

 larly colored spots ; in one male specimen the spot is in contact 

 with nearly the whole lateral margin. Legs, except base of 

 coxse and last two joints of hind tarsi, wholly yellow. Wings 

 hyaline. Length, 7 mm. 



Six specimens ; May and June. 



Eristalis. 



(Latreille, Hist. Nat. des Crust, et des Ins., XIV, 363; 1804.) 



Eristalis longicornis, n. sp. 



Female: Vertex subshining black, black pilose; middle 

 third of front yellowish pollinose, and yellowish and black pi- 

 lose ; lower third and antennal protuberance subshining black, 

 sparsely black pilose. Eyes pilose above ; with small black 

 dots, most numerous and mostly fused on posterior half. Face 

 black, grayish pollinose, light yellow pilose ; median vitta 



