388 ENTOMOLOGICAL NEWS. [Nov., 'l6 



the lateral stripes ; post alar callus somewhat produced and flattened, 

 strongly haired ; prealar callus protuberant, roughened, and strongly 

 haired ; scutellum narrow, rounded, pale brownish-gray, with a trans- 

 verse row of long fine hairs ; post-scutellum deep dull black, faintly 

 polished and obscurely pitted ; halteres club-shaped, usually pale, but 

 smoky in heavily-pigmented examples ; legs smoky brown with dark 

 vestiture, the femora hairy ; vestiture of tibiae shorter, though success- 

 ively longer and more hair-like on the second and third pairs ; front 

 metatarsi about half the length of their tibiae; all tibiae spurred. 

 Wings not very densely clothed with fine short gray-brown hairs, 

 stronger on the costal edge ; th-e R-M cross-vein either barely in con- 

 tact with the radius without fusion, or in some examples failing to 

 reach the radius by its own width ; fork of cubitus slightly distad of 

 origin of cross-vein. 



Abdomen unmarked, smoky brown to dull black ; clothed dorsally 

 and ventrally with long hairs, black but in some lights with pale brown 

 reflections, springing from slightly elevated polished bases ; hypopygium 

 with a central needle-like dorsal keel, the point translucent, the broad- 

 ened rouqded base hairy; its lateral lobes strongly haired, their slender 

 inward-hinged terminal joints somewhat clubshaped and ending with 

 a pointed lateral projection on each. Length, dry examples, 3 mm.; in 

 balsam, nearly 4 mm. 



9 . Much paler and more yellowish-brown than the male ; the ab- 

 domen distended, not so conspicuously hairy ; the wings slightly shorter 

 and broader; antennae of six visible joints, the disc-like basal joint 

 smaller than in the $ and yellowish-brown; the second joint slightly 

 larger than the remaining four, which are of nearly equal length ; all 

 but the basal and terminal joints bear a few long sub-erect hairs; hairs 

 of terminal joint very fine and short; palpi as in the $ ; eyes black; 

 thorax more densely colored than the abdomen ; its hairs pale yellowish- 

 brown ; leg-vestiture dark. The large bodied females shrink so in 

 drying that measurements of them are deceptive; in balsam they slight- 

 ly exceed the $ in length. 



Described and illustrated from many examples of both 

 sexes, of which I designate as types, $ and 9 , a pair mounted 

 dry and deposited in the U. S. National Museum (Cat. No. 

 20317) ; paratypes are with the Academy of Natural Sciences, 

 Philadelphia, and in my own collection. 



Type locality, Mount Eddy, near Sisson, Siskiyou County, 

 California ; occurrence of larvae, pupae and flies, apparently 

 throughout the warm months ; hibernation probably as larvae 

 of various ages. 



