40 Clarence E. Mickel 
Pseudoplisus rufomaculatus (Fox). 
1895. Gorytes rufomaculatus Fox, Proc. Acad. Nat. Sc. Phil., p. 538. 
Females 1: Bad lands at the mouth of Monroe Canyon, July 
22, 1901 (M. A. Carriker, Jr.), on Helianthus sp. 
PSENINAE 
KEY TO THE GENERA 
1. Cubital vein in hind wings originating beyond the transverse median 
nervure, the latter short and straight, perpendicular; submedian cell 
in front wings a little shorter than the median, the transverse me- 
dian vein not interstitial with the basal vein; second cubital cell 
ustally, ‘mich narrower above: . oi/yc.2ks Fos oa wee eee ee Diodontus 
Cubital vein in hind wings originating before the transverse median 
vein, the latter long and oblique or slightly bent, but not perpen- 
Aremlar: Sle jo teas eee Cate see oe ere ela © career ee ee 2 
2. Second and third cubital cells each receiving a recurrent nervure, or 
the first recurrent nervure is interstitial with the first transverse 
cubital vein; head with a spine between the antennae; clypeus ante- 
riotly Timimed, and with. a‘mediam Sinus <.<... 0c. cess = sememeee Psen 
Second cubital cell receiving both recurrent nervures, rarely with the 
first recurrent nervure interstitial with the first transverse cubital 
vein; inner spur of hind tibiae dilated; propodeum with a median 
sulcus, the area at the base striate or alveolate; petiole of abdomen 
long, usually furrowed laterally; clypeus convex or subconvex, 
separated, anteriorly more or less rounded and with a slight vein, 
but without a median sinus; labrum hidden ............... Mimesa 
Diodontus Curtis 
KEY TO THE SPECIES 
Abdomen black, with bluish reflection, apical margin of segments testa- 
CEOMSS Airsce seatiess aera elope aeketerarehee Bare aus tauenele Sears ema clea tetas eeN ee e tibialis 
Diodontus tibialis (Cresson). 
1872. Mimesa tibialis Cresson, Trans. Amer. Ent. Soc., IV, p. 488. 
1898. Psen tibialis Fox, Trans. Amer. Ent. Soc., XXV, p. 18. 
Males 22, female 4: Rulo (1), Omaha (20),. Louisville (1), 
Red Cloud (3) and McCook (1); June 20 to August 20; visits 
flowers of Chamaecrista fasciculata. 
358 
