ART. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 91 
segments silvery pollinose, the rest of the venter shining black. 
Wings hyaline or with a grayish tinge. 
Type locality—Glen Martin, in the San Bernardino Mountains, 
San Bernardino County, California, August 16, 1920 (F. R. Cole). 
Type.—Male, Cat. No. 25935, U.S.N.M.; allotype, female, in same. 
This species in some ways forms a connecting link between 
Psilocephala and Thereva. By reason of the hairy face it would 
be classed with the genus Thereva, and yet it has many characters in 
common with the haemorrhoidalis group in Psilocephala, the frons 
of the female resembling some of the species in that group; like the 
males in that same group, the abdomen is rather flattened and silvery 
pollinose above. Perhaps the writer is too conservative, but for the 
present it seems best to hold to the old character of the bare or pilose 
face for distinguishing the genera Thereva and Psilocephala. 
The species described above was collected along the edges of a 
small stream. Although very quick in their movements these flies 
are sometimes easily caught while they are rummaging about in the 
drift trash at the edge of the water. Like many other Therevids 
their normal flight is hoplike and for short distances only. 
Paratypes.—There are 10 males and 15 females, taken by the 
writer at Glen Martin, the type locality, from August 7 to 20. One 
paratype, taken at Shasta Springs, July (C. L. Fox), in the California 
Academy of Sciences. 
THEREVA ANOMALA Adams. 
1904. Thereva anomala ApAms, Kans. Univ. Sci. Bull., vol. 2, p. 444. 
The species is said to resemble some species of Psilocephala in gen- 
eral appearance. It has two brown crossbands on the wing. The 
length is given as 9 to 10 mm. 
Type locality Oak Creek Canyon, Arizona. 
Types.—In the Kansas University collection. 
THEREVA MELANONEURA Loew. 
Plate 10, fig. 125; plate 11, fig. 145; and plate 12, fig. 156. 
1872. Thereva melanoneura Loew, Berlin. Ent. Zeitschr., vol. 16, p. 74. 
Type locality.—California. 
Type.—tn the Museum of Comparative Zoology at Caiubridye. 
This is another Psilocephala-like species, with dense silvery white 
pollen on the dorsum of the abdomen in the male. 
A male specimen from New Mexico loaned by C. W. Johnson 
but for the hairy face would be placed in Psilocephala. The hair of 
the frons and face is as long or longer than the first two antennal 
joints combined. The middle of the frons is very thinly pollinose, 
