Willlston.] 'jt)-i LMaylif. 



MiCRODON sp. nov. V Washington Territory, California ! 



This is the first time this genus has been recorded from the Pacific 

 coast ; eight or nine species are known from the eastern part of the con- 

 tinent. 



AA. — Scutellum witliout points ; third antennal joint elongate ; face pro- 

 duced downward, obtusely tuberculate, yellow with black median 

 stripe ; dorsum of thorax witli lateral, yellow, interrupted stripes ; 

 abdomen oval, arched, with yellow bands ; eyes i>ubescent, 



Chr ysotoxum . 



This is one of those genera of Syrphidie, whose species are hard to dis- 

 tinguish and require much material to satisfactorily study. 



Chrysotoxum (?) DEiiiVATUMWalk., Washington Territory ; Mt. Hood, 

 Oregon. Apparently a common species. The femora are mostly black, 

 and the lateral margins of the abdomen yellow, otherwise it agrees with 

 G. laterale Lw., Cent, v, 42. 



II. 



J. — Small cross- vein before the middle of discal cell. 

 1. — Antennpe as long or shorter than the head. 

 a. — Marginal cell open. 



a. — Face without turbercle or hyperstoma not produced. 



B. — -Abdomen of only four apparent segments ; very small species 

 (2-5 mm.) black or greenish black, the ground color unrelieved by 



lighter spots, stripes or bands *Triglyphus. 



BB. — Abdomen of from five to seven segments; third joint of antenna? 

 oblong. 



C. — Face evenly rounded, not at all projecting in outline (hind femora 

 moderately swollen) ; face dark without yellow Pipiza. 



A single species of this genus is recorded by Osten Sacken (West. Dipt. p. 

 323) from Sonoma Co., Cal. In Europe the species are very numerous. 



CC. — Face slightly carinate below, partly or whollj^ yellow, eyes pilose, 

 in life usually with bright stripes (small, mostly finely punctulate ; 

 abdomen oval, obtusely rounded behind, black or black and red, not 

 banded) Paragus. 



The species of this genus like the preceding are very difficult to sat- 

 isfactorily distinguish. Three species are recorded from the Eastern 

 States and I have at least three more yet unnamed from the Pacific re- 

 gions. 



Paragus dimidiatus Lw,, Cent, iv, 63. Western Kansas, Colorado ! 



III. 



A. — Small cross-vein before the middle of discal cell. 

 1. — Antenna; as long or shorter than the head. 

 a- — Marginal cell open, 

 aa. — Face tuberculate, or hyperstoma produced. 



*. — Abdomen oval, never narrowed toward the base, or club- 

 shaped, 

 f. — Uniform metallic green, metallic green and black, or 

 black species ; hind femora never swollen. 



