ART. 4. REVISION OF THE FAMILY THEREVIDAE—COLRE. 51 
Type.—In the Museum of Comparative Zoology at Cambridge. 
Distribution.—The distribution according to six males and eight 
females examined is as follows: 
Washington: Wenass Valley, Pressey’s, July 6, 1882 [M. C. Z.]. 
Nevada: Ormsby County, July 6 (C. F. Baker), [Stanford Univ.]. 
California: Santa Paula [Cornell]; no data (Osten Sacken), [M. C. Z.]; 
San Diego, April 19 (F. E. Blaisdell); Sisson, July 25 (EK. P. Van 
Duzee), [both Cal. Acad. Sci.]; mountains near Claremont (C. F. 
Baker); Claremont (C. I’. Baker); Laguna Beach (C. F. Baker), [all 
Pomona College]; Concord, August 23 (M. C. Lane),[Cole]; Santa 
Clara (Harkins), [Stanford Univ.]. 
PSILOCEPHALA ARGENTATA (Bellardi). 
1861. Thereva argentata BELLARDI, Saggio di Ditterol. Messic., vol. 2, p. 90. 
From the fairly comprehensive original description one would judge 
that this species is very close if not identical with P. platancala Loew. 
Williston redescribed the species from a male taken at St. Vincent, 
West Indies, and gave a poor figure of the antenna. Bellardistated 
that the species was related to Thereva anilis of Europe, but this 
species is now placed in the genus Dialineura. 
Type locality.—Cordoba, Mexico. 
Types.—When described the types were in the collections of Bel- 
lardi and Saussure. Bellardi’s collection is in Turin, Italy. 
PSILOCEPHALA NIGRIMANA Krober. 
1912. Psilocephala nigrimana KroBeER, Stett. Ent. Zeit., p. 238. 
From the description this would appear to be the same as platan- 
cala, and it comes from a locality where one would expect to find 
platancala. But Kréber determined a series of platancala sent to him 
from the National Museum as haemorrhoidalis. A specimen collected 
at Claremont, California, and loaned by the National Museum for 
study, was determined by Kroéber as Psilocephala near nigrimana; 
the specimen is a paratype of signatipennis described above. Col- 
lecting in the type locality will eventually determine the status of 
the species. 
Type locality —Pueblo, Colorado. 
Type.—In the Hofmuseuim in Vienna. 
PSILOCEPHALA ALDRICHI Coquillett. 
Plate 5, figs. 38 and 39; and plate 6, fig. 42. 
1893. Psilocephala aldrichi CoquintETt, Can. Ent., vol. 25, p. 227. 
There has been some confusion as to the identity of this species 
owing to the lumping of two distinct species by Coquillett. Mr. John- 
son loaned the cotype of the form found in New Jersey, and it is 
60466—23—Proc.N.M.vol.62——17 
