308 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Se«. 



This species differs from any species of the genus known 

 to me in its color, the pale bases of the hypopygial forceps be- 

 ing very conspicuous and characteristic. 



11. Hylemyia recurva, new species 



Male. — Black, slightly shining, densely yellowish gray 

 pruinescent. Head black, interfrontalia slightly reddish. 

 Thorax not vittate ; abdomen with a black dorso-central vitta ; 

 legs black, tibiae reddish, usually entirely so, but in some 

 specimens only so at bases ; wings clear, calyptr?e and halteres 

 pale yellow. 



Eyes separated by a little more than width of anterior 

 ocellus; parafacial nearly as broad as third antennal joint; 

 arista with its longest hairs a little shorter than wndth of 

 third antennal joint. Presutural acrostichals irregularly two- 

 rowed ; prealar bristle minute or absent : sternopleurals 1 :2. 

 Abdomen slender, depressed, segments subequal; hypop3'gium 

 small; fifth sternite \v\i\\ sparse, slender bristles on outer half. 

 Fore tibia with a median posterior bristle, the apical posterior 

 bristle of moderate length, slender, not blunt at apex; mid- 

 tibia wuth a posterior bristle about two-fifths from apex, and 

 beyond it on the postero-dorsal surface two long strong 

 bristles; hind femur with fine bristles on entire length of 

 antero-ventral surface which are short at base ; hind tibia with 

 three postero-dorsal and two antero-dorsal bristles, the longest 

 of the latter just beyond middle and a little less than half as 

 long as the tibia; in addition to these bristles there is a series 

 of four or five long bristly hairs running diagonally from 

 anterior surface at tip basad and on to antero-dorsal surface, 

 the anterior surface with the hairs longer than usual. Costal 

 thorn small. 



Length, 5-5.5 mm. 



Type, male, No. 538, C. A. S., Huntington Lake, Calif., 

 alt. 7000 feet, July 27, 1919; E. P. Van Duzee, coll.; two 

 paratypes, both males, topotypical, and one male, same locality, 

 July 10, 1919; F. C. Clark, collector. 



This species is one of a group of three all of w^hich are un- 

 described and have either one or two very strong bristles on 

 postero-dorsal surface of mid-tibia near apex. 



