WlHiston.] 310 [May 19, 



II. — Anterior tibise and tarsi of male not dilated Melanostoma. 



Melanostoma tigrina O. S., West Dipt. 323, Washington Territory, 



California ! common. 

 Melanostoma scalakis Meigen ; Scliiner, Fauna Austr. Dipt., 291, 

 Colorado ! Europe and North America. 



VI. 



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

 2. — Antenn.e short. 

 a. — Marginal cell open, 

 aa.— Face tuberculate, hyperstoma not produced, 

 *. — Abdomen oval or elongate, not club-shaped. 

 fff . — Black or greenish-black, with yellow markings. 

 iig. — Face wholly or in part yellow. 



-■ — Dorsum of thorax with yellow lateral stripes. 



J. — Abdomen with seven visible segments, the hypopygium unusually 

 large Sphaerophoria. 



I have numerous specimens of this genus from the Western regions, 

 among which there are probably four or five species. I recognize, how- 

 ever, only one species, viz : 



Wph^rophoria micrura O. S., West Dipt., 330, California ! 

 ' * Sph.erophoria sulphuripes Thomson, Eugen. Resa, 501 (SyrpJms), 

 O. S., 1. c, Calif. 



JJ. — Abdomen not showing more than six segments, hypopygium not 

 unusually large. 

 K. — Eyes of male with an area of enlarged facets above ; abdomen 

 rather slender, fourth segment with yellow median stripes and 



oblique side spots. AUograpta. 



* Allograpta fracta O. S., West Dipt., p. 331. Santa Monica, Cal. 



KK. — Eyes of male without area of enlarged facets (fourth segment of 

 abdomen fasciate), 

 L. — Thorax with a median, dorsal, cinereous line ; ocellar tubercle re- 

 mote from vertex ; slender species. 

 M. — Posterior femora enlarged and bent Toxomenis. 



ToxOMERUS GEMiNATUS (Say). Washington Territory ! California, 

 Eastern States. 



Scceva gendnata Say, Compl., Wr. ii, 80. 



Toxomerus notatus Macq., Dipt. Exot., 5 Suppl., 93. 



Mesocjrapta geminata Schiner, Novara Exped. O. S. Cat. Dipt. p. 125, 

 West. Dipt., p. 330. 



MM. — Posterior femora simple Mesograpt a. 



Mesograpta margtnata (Say). O. S., Kern Co. Cal. ! Atlantic 

 States, common. 



