6 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



the tip of the second antenjial joint. Beyond this the parafacial is 

 silvery, becoming more gray below, and this color covers the cheek 

 and back of head. Thorax as in male. Abdomen black, covered 

 with thin, dull-gray pollen. Legs plain, mid tibia without a bristle 

 on outer front side. 



Length, of male 4 mm., female 3.2 mm. 



Described from one male (type) and one female (allotype) reared 

 from a dead cat at Upland, California, by J. F. Illingworth; both 

 specimens emerged May 25. 



Type.— Cat. No. 28881, U.S.N.M. 



The broad shining space between eye and root of antennae in the 

 female is very unlike the silvery narrow corresponding part in the 

 male. 



HYDROTAEA ABDOMINALIS, new species 



Male. — Eyes bare, front very narrow, composed for some distance 

 of the linear parafrontals only; no frontals in and above the narrow- 

 est part ; paraf acials of moderate width and subsilvery pollinose above, 

 more gray below. Cheek about one-eighth the eye height. Palpi 

 and antennae black. 



Thorax subshining black with very thin brown pollen. Hairs of 

 mesonotum erect and long. Anterior acrostichal tall and slender, in 

 about four rows but irregular; sternopleura with numerous long hairs 

 besides the bristles; no hairs on the sclerite anterior to metathoracic 

 spiracle. Halteres with black knob. Calypters pale, with yellowish 

 rim and fringe. 



Abdomen rather flat above, densely covered with pollen of a pale- 

 bluish color; a black median line is distinct. 



Legs black. Front femora and the usual thorns directed forward; 

 a row of setae extends toward the base from each thorn; outer flexor 

 side of tibia with long hairs. The front femur has some long, trun- 

 cate bristles close to base. Middle femur with several scattered 

 truncate bristles in two rows below on basal half or more, and with 

 several long bristles on upper front side, also on the basal half. 

 Middle tibia with row of erect small hairs on front side, much as in 

 dentipes Fabricius; without a bristle on outer front side, but with 

 two on the outer hind side. Hind femur without truncate bristles, but 

 with complete rows of long ones on upper front, lower front, and 

 lower hind sides. Hind tibia with long delicate flexor hairs begin- 

 ning a httle beyond base, and with much longer scattered hairs or 

 bristles in a row each side of the flexor surface, the rows being just 

 about equal. Claws and pul villi short. 



Wings subhyaline, narrow apically, costa reddish beyond the aux- 

 iliary for some distance. 



Length, 4 and 4.4 mm. 



