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



and some long hairs, laterad of these are some short setulose 

 hairs. GenitaHa with two long processes as in Helina, and 

 without thorns or strong bristles. 



Length, 5-6 mm. 



Tyi^e, male, No. 527, C. A. S., Huntington Lake. Calif., 

 altitude 7000 feet, July 9, 1919; E. P. Van Duzee. coll.; 

 allotype, female, No. 528, C. A. S., and female paratypes, 

 same locality, July 9, 1919 (F. C. Clark, coll.), and July 26, 

 1919 (E. P. Van Duzee. coll.). 



This species closely resembles one before me from Labra- 

 dor, which is undescribed, and is not very closely related to 

 any described North American species, though it superficially 

 resembles L. nobilis Stein. 



5. Dialyta nigropolita, new species 



]\lale and female. — Black, shining, almost glossy; orbits, 

 face, and cheeks with white, almost silvery tomentum. Thorax 

 and abdomen with slight grayish pruinescence, the former 

 with very faintly indicated dorsal vittse ; legs black : wings 

 grayish; calyptrae and halteres yellowish white. 



Male. — Eyes separated by one-fourth of the head-width, 

 each orbit nearly as wide as narrowest part of interfrontalia, 

 with six or seven bristles; parafacial nearly as wide as third 

 antennal joint, the latter about twice as long as second, ex- 

 tending three-fourths of the way to mouth-margin : arista 

 with its longest hairs distinctly longer than its basal diameter ; 

 cheek a little higher than width of third antennal joint. 

 Thorax with three or four pairs of short presutural acrosti- 

 chals, three pairs of postsutural dorso-centrals, and no prealar ; 

 sternopleurals in a nearly equilateral triangle. Abdomen short 

 and thick, cylindrical, the hypopygium very large, giving the 

 abdomen a slightly clubbed appearance ; second, third, and 

 fourth tergites each with discal, and the third and fourth 

 with posterior marginal bristles; fifth tergite declivitous, 

 armed with numerous strong bristles; fifth sternite conspicu- 

 ous, with a pair of long processes which are strongly bristled. 

 All coxae and the ventral part of sternopleura with long hair- 

 like bristles ; femora with very long fine bristles basally on 

 postero-ventral surfaces; fore tibia with a weak antero-dorsal 



