Vol. IX] MALLOCH— FLIES (DIPTERA) FROM CALIFORNIA 311 



postero-dorsal bristles. Costal setulas very short ; costal thorns 

 both long; last section of fourth vein subequal in length to 

 preceding section. 



Type, male, 10 mm. long, No. 540, C. A. S., Sonoma Co., 

 Calif., April 16, 1911 ; J. Aug. Kusche, coll. 



This species differs from H. incomplcta Stein and H. 

 humcralis Stein in having the second antennal joint rufous, 

 in being larger, and in the bristling of the cheeks and tibiae. 



Family SCATOPHAGID^ 



The species described below is the first of the genus to be 

 recorded from America. The genus is well represented in 

 Europe, where some of the species are very common. The 

 adults are predaceous, feeding upon other insects. 



The type of the new species is deposited in the collection 

 of the California Academy of Sciences. 



15. Norellia occidentalis, new species 



Female. — Yellowish testaceous, shining, with gray pruines- 

 cence; abdomen with a dark fascia at base and another at 

 apex of each tergite; wings clear, cross-veins slightly infus- 

 cated. 



Each orbit with three or four bristles in front of lower 

 supraorbital; arista with its longest hairs a little longer than 

 its basal diameter; cheek with some pale hairs along its lower 

 margin; no bristles at base of vibrissa. Thorax with two or 

 three rows of weak presutural acrostichals ; the dorsal bristles 

 strong; apical scutellar bristles very small, the lateral pair 

 long; propleural bristle long, stigmatal absent; abdomen nor- 

 mal ; fore femur with the antero-ventral bristles less than half 

 as long as the postero-ventrals ; fore tibia with four very 

 strong postero-ventral, and four much weaker antero-ventral 

 bristles, the postero-dorsal surface with one, and the dorsal 

 with two fine bristles on basal half; mid- and hind femora 

 with three bristles on apical third of antero-ventral surface; 

 mid-tibia with one antero-ventral, two antero-dorsal, two 

 postero-dorsal, and two or three postero-ventral bristles ; hind 



