11)11] Peomachus and Proctacanthus 159 



Proctacanthus caudatus n. sp. 



Total length 28 to 30 millimeters. Mystax and beard pale yellow, 

 palpi yellowish red with pale yellow hair, antennae and proboscis black ; 

 thorax dark with some light pollinose markings, bristles of thorax 

 black, numerous but not very stout black bristles on the scutellum; 

 femora black, tibia red, black at the apices, tarsi black; wings pale 

 brownish. Male abdomen yellow, exceptfirst segment and the base of 

 the second which are largely black, hypopygium from dorsal view wide, 

 from side view widened near the apex which is obliquely truncate. 

 Female abdomen entirely dark, except the posterior margin of each of 

 the second to fifth segments which are red; first abdominal segment in 

 both sexes with numerous yellow hairs on each side. 



The male type and one female from Veracruz, Mexico, col- 

 lected by D. L. Crawford, of Pomona College, Ontario, Cal. 



The male hypopygium is very different from that of fulvi- 

 ventris or rufus. 



In Volume I, page 206, Biol. Cent. Am. Osten Sacken men- 

 tions a female of a species of Proctacanthus which appears to 

 be the same as this one. His specimen was taken at San 

 Geronimo, Guatemala. 



Proctacanthus occidentalis n. sp. 



Total length 30 to 30 millimeters. A modest colored species having 

 nearly clear wings with many of the veins narrowly margined with 

 brown. Mystax very pale yellow, usually with a few black bristles, 

 beard white, palpi black with some black and some white hair, occipito- 

 orbital bristles partially white and partially black; thorax pale brown- 

 ish or gray, mostly with black bristles, scutellum with numerous black 

 bristles and scattering fine white hairs, humeral callus distinctly lighter 

 gray than the other parts of the thorax and toward the median line 

 from each of these is a small white spot which is of some use in deter- 

 mination for most other species do not have such a marking. Wings 

 nearly hyaline, in most specimens the longitudinal veins are faintly 

 margined with brown; femora red posteriorly and nearly black anteri- 

 orly, tibiae colored with reddish and blackish in various combinations; 

 abdomen dark, gray pollinose, male genitalia shorter than the last two 

 abdominal segments, appendages curved towards each other at the tips 

 so that they nearly meet; female genitalia with the end piece densely 

 yellowish pilose and with the spines at the tip so small that they are 

 not plainly differentiated from the other hairs of the region. 



Male type from Los Angeles County, California, and eleven 

 other specimens from California and Idaho, mostly collected 

 by Coquillett and Aldrich. 



