DIPTERA OF BAJA CALIFORNIA. 6ll 



cidedly incrassate. Wings nearly clear, some of the 

 cross-veins slightly yellowish infuscated. 



This species wonderfully resembles a small green bee. 



33. MiCRODON XANTHOPILIS n. sp. 



California. Two specimens, S ? • Length, about 11 

 mm. Pile of whole body is brassy yellow, in the S almost 

 orange yellow. Antenna brown, first joint fully as long 

 as second and third together. Head, thorax, scutellum, 

 and first two abdominal segments shining metallic green; 

 rest of abdomen brown, fourth segment of ? nearly as 

 long as preceding two, in S much longer. Spines of scu- 

 tellum not prominent. Legs brown, short golden pilose. 

 Hind metatarsi but little swollen in either sex, as long as 

 next two joints. Wings uniformly slightly smoky. Pile 

 of face, front, thorax, scutellum, and base of abdomen 

 thicker and longer than on rest of abdomen. 



It differs from luegalogaster Snow by the golden pile of 

 abdomen, and brown coloring of latter. It is more nearly 

 related to megalogaster than to botnhiformis Towns., which 

 is a stouter and larger species than either. In the right 

 wing of the $, the stump of vein normally found in first 

 posterior cell is absent. 



34. Chilosia n. sp.? 



Marin county, Cal. (Haines). One male. Length, 

 9^ mm. Abdomen opaque black, first segment shining 

 black; narrow anterior border entire of second, third, 

 and fourth segments dark metallic shining green. These 

 green cross -bands are the only difficulty in the way of 

 locating the specimen in this genus, with which it agrees 

 in all other characters. It cannot be placed in Melanos- 

 toma, as the arista is plumose. 



The thorax and scutellum are -blackish green. An- 

 tennse reddish brown, third joint largely yellowish on 



