118 Psyche [August 
Dioctria longicornis sp. nov. 
This in appearance is similar to D. brevis; in some the mystax is 
mostly white, and the pleural piece in front of wing-base is not 
often pollinose. The male genitalia are closely similar to those of 
D. brevis, but the branches of the lateral appendages are not just 
the same. It differs, however, at once from D. brevis and also D. 
albius in the very much longer antenne; the third joint being much 
longer than the first and second together, and the style longer and 
about as thick as the third joint. 
Specimens.are 7 (co) to 9 (2) mm. long, and all I have are from 
the vicinity of Washington; Chain Bridge, Glenearlyn, and Dead 
Run, Virginia. 
Type: M. C. Z. 10033. 
Dioctria longicornis var. tibialis var. nov. 
Two males differ from the type in having all the tibiz reddish 
on basal half. They are from Chain Bridge, Va. 
Type: M. C. Z. 10034. 
Dioctria media sp. nov. 
Black, face golden, mystax black, thorax and abdomen more 
hairy than in D. albius, thorax reddish pollinose much as in D. 
albius; the third antennal joint and the style about as in D. albius; 
the body shorter than in D. albius; the male genitalia have the 
superior plate a slender, finger-like projection, about four times as 
long as broad, with parallel sides and undivided; the lateral arms 
of the genitalia are very much shorter and heavier than in either 
D. albius or D. brevis. Length 7 to 8 mm. 
Five specimens from Sonoma County, Calif., 4 July (Osten 
Sacken), San Raphael, Calif. (Osten Sacken) and California (H. 
Edwards). These were doubtfully referred to D. albius by Osten 
Sacken, but the male genitalia show them to be very distinct. 
Type: M. C. Z. 10037. 
Dioctria pleuralis sp. nov. 
Black, face golden to white, mystax pale; third joint of the anten- 
nee very long, the style about one-fourth of the third joint; vertex 
shining, the thorax with mostly yellowish hairs. On the pleura 
