384 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Length, 9.5 mm. Female: Antennae black; second joint luteous, third 

 sometimes reddish brown, sub-cordate, 1}^ times longer than wide; arista 

 brownish. Face and front shining black, the former covered with whitish 

 dust extending narrowly up sides of front and enlarging below middle to form 

 sub-triangular spots which do not occupy half the width. Immediately below 

 these spots is a rather broad transverse carina occupying over J^ the width 

 on each side. Except for a few black hairs above the antennae the pile is 

 whitish; a bare area below the antennae extending as a narrow V to oral margin. 

 Front noticeably wider than usual with the pile over the pollinose spots directed 

 inwards. Thorax and scutellum slightly shining with an obscure metallic 

 bluish or greenish blue tinge, entirely whitish pilose; scutellum without a 

 groove. Abdomen shining metallic bluish black, only the broad black pilose 

 hind margins of second and third segments appearing darker, these pilose areas 

 not reaching sides; elsewhere the pile is rather short grayish white, longer bas- 

 ally; apex of terminal segments with a few scattered black hairs. Legs black; 

 tips of all the femora, base of hind tibiae, broad base of anterior four tibiae 

 and their tips, and first two joints of anterior four tarsi, yellowish; middle of 

 anterior four tibiae and apical joints of their tarsi, piceous. Wings hyaline or 

 with cells on the apical half luteous in their middle; stigma luteous; halteres 

 yellow. 



Holotype, female, reared by Mr. W. M. Davidson, 

 labelled: "Bred from larva aphidophagous on Hetero- 

 meles arbutifolia, San Jose, Cal., July 24, 1912."; in the 

 United States National Museum. 



Paratype, female, Mus. Calif. Acad. Sci., Sobre Vista, 



Sonoma Co., Calif., May 12, 1910, (J. A. Kusche) col- 

 ector. 



Unfortunately no pupal case accompanied the holo- 

 type. The note on the larval habit is of interest as 

 showing the habits of the immature stages of this genus. 

 I have frequently observed that Syrphid larvse of some 

 species are more common than the adults, due, no 

 doubt, to the fact that these larvse are very often heavily 

 parasitized. For further notes see macrofemoralis. 



Unrecognizable Species. 

 Pipiza(?) crassipes (Bigot) 

 Bigot, Ann. Soc. Ent. France, Ser. 6, III, p. 557, 1884. 



Habitat: North America. Length, 7 mm. "Female: Black, a little shining, 

 almost bare; antennae with third joint and arista yellow; face evenly finely gray- 

 ish pollinose. Slightly white pubescent on the pleurae and femora. Halteres 

 testaceous. Wings a little brownish, hyaline at base; stigma brownish. Knees 

 yellow, hind legs and basitarsi considerably swollen." (Bigot: translation.) 



Pipizella(?) apisaon (Walker) 

 Chrysogaster Apisaon Walker, List, III, p. 572, 1849. 



