110 D. W. COQUILLETT. 



4. — Wings, except in the costal cell, wholly hyaline 6. 



Wings marked with brown in other portions than the costal cell, breast des- 

 titute of black pile 5. 



5. — Wings hyaline, costal, first basal, base of marginal and of first submarginal 

 cell brown, a brown cloud at base of fourth posterior cell. 



bucerus n. sp. 

 Wings hyaline, marked with several brown clouds, costa of male destitute 



of teeth-like processes planus O. 8. 



6. — Pile of face, breast and venter white or yellowish 7. 



Pile of face, antennse, breast and venter largely black, costa of male destitute 



of teeth-like processes , apicnla Coq. 



7. — Abdomen shining, its tomentum confined to the sutures of the segments, 



proboscis scarcely longer than the thorax niiscellii.S Coq. 



Abdomen subopaque, uniformly tomentose, proboscis nearly as long as the 

 thorax and abdomen united, costa of male destitute of teeth-like pro- 

 cesses junceus Coq. 



L.or(Iotus bucerus n. sp. 9.— Black, the knob of halteres yellow. Pile 

 of head yellowish, that on upperside of first and on both sides of second anten- 

 nal joint, also that on palpi black ; pile of thorax, scutellum and abdomen yel- 

 low, except on posterior half of fourth segment, which is black ; the appressed, 

 crinkled tomentum whitish; wings hyaline, costal, first basal, basal two-thirds 

 of marginal and base of first submarginal cell smoky-brown; veins at base of 

 first and fourth posterior cells clouded with brown ; second antennal joint 

 scarcely longer than broad. Length 10 mm. 



Southern California. Two males, in April. Nearest related to 

 gibbns Loew, but with a shorter second antennal joint, pile of an- 

 tennae largely black, instead of being wholly yellow, and the tibiae 

 are black instead of yellow ; the thorax is also much less gibbous. 



BOnBYLIUS Linn. 

 Bombylius fratellus Wied. is a synonym of B. vmjor Linn. Both 

 of these forms occur in California as well as in the Atlantic States 

 and in Germany; every possible gradation occurs between them, so 

 ih^i fraiellus cannot even be regarded as a variety. 



ANASTCECHUS O. S. 



Anadcechus barhatus O. S. is a synonym of A. nitidulus Fabr. 

 Specimens of this latter were received from V. von Roder, of Ger- 

 many, and agree in all respects with my Colorado examples. 



GERON Meigen 

 Geron albidipennis and G. vitripenni^ are synonyms of Geron 

 ■senilis. Geron viaeroptervs is the male of calvus. G. holoseviceus 

 Walker has not been identified. The other sj)ecies from North 

 America are contained in the followino; table: 



