176 
Psyche 
[December 
strongly impressed. The first tergite is distinctly rounded 
in dorsal aspect, and has a less sharply marked anterior face. 
Other .structural differences occur in the eighth sternite 
(figs. 3 and 4) and the parameres of the genitalia (compare 
fig. 5 with Parker’s fig. 29). 
The author discovered another genitalic character while 
comparing his paratype of iridis with two males of occi- 
dentals kindly loaned by Dr. C. D. Michener. In occidentals 
the compressed shaft of the digitus, when viewed laterally, 
is rather uniform in width, but in iridis its ventral margin 
is strongly emarginate. 
Stizus occidentalis Parker 
1929. Stizus occidentalis Parker, Proc. U. S. Nat. Mus. 
75 (5) : 9, pi. 4, fig. 29. 3,9. 
This species was described from two specimens: a male 
from “San Diego County,” California, collected by Coquillett, 
and a female from Florence, Arizona. As a result of the 
present author’s recent trip to California, six additional 
specimens were located in various collections. This mate- 
rial, which considerably extends the known range, indicates 
that occidentalis is a desert species of the Lower Austral 
Region, and suggests that the holotype collected by Coquillett 
may really have been taken in what is now Imperial County, 
formerly the eastern part of San Diego County. 
California: Panamint Mts., Inyo Co.; May 29, 1937; 
N. W. Frazier, 1 3 [California Academy of Sciences] . Wild 
Rose Canyon, Panamint Mts., Inyo Co. ; elevation, 3000 ft. ; 
flying about flowers of Prosopis chilensis in noonday sun- 
light; May 28, 1937; C. D. Michener; 2 3, 19 [C. D. 
Michener]. Furnace Creek, Death Valley; on Pluchea seri- 
cea; May 1, 1927; P. H. Timberlake; 1 9 [University of 
California Citrus Experiment Station]. Eight miles south 
of Needles; on Acacia greggii; June 4, 1938; P. H. Timber- 
lake; 1 9 [University of California Citrus Experiment 
Station] . 
Stizus brevipennis Walsh 
1869. Stizus brevipennis Walsh, Amer. Entomologist 1 : 
162. 3 . 
