I1O Clarence E. Mickel 
Pemphredon Latreille 
Pemphredon inornatus Say. 
1824. Pempredon inornatus Say, Long’s Exped., Il, App., p. 339. 
1892. Pemphredon inornatus Fox, Trans. Amer. Ent. Soc., XIX, p. 
312. 
Males 4, females 6: Omaha (6), Lincoln (1), Fairmont (1), 
Monroe Canyon (1) and Bad Lands (1); May 20 to August 18. 
Xylocelia Rohwer 
‘KEY TO THE SPECIES 
Females 
rt) Mandibles? yellowash ore wihitishy 9.667.005 scien See eee eee 2 
Mandibles entirely black; mesonotum not densely frtiette before the 
scutellum ; striato-punctate at the base; front striato-punctate..ater 
pwhitbencles  blackevs:< 2 cavitcose are wnckata ont ietener ok Siete ty Ac oo oe eee 3 
to 
3. Posterior face of propodeum without any wedge-shaped fovea, the en- 
tire surface coarsely reticulate; legs more or less testaceous; labrum 
broadly and: shallowly, emaneinate jase. oe cee sere eee Spiniferus 
Posterior face of propodeum with a median, moderately deep, wedge- 
shaped fovea; remainder of posterior face finely, irregularly ru- 
BOSE 4 lage v ave: aA rake, a vatels, rn ian Oe ks OED Se eT eee 4 
4. Apical antennal joint with a strong longitudinal furrow beneath; all: 
the tibiae testaceous; emargination of labrum broad and deep, 
antennatus 
Apical antennal joint not furrowed beneath, simple; all the tarsi more 
or less blackish; emargination of labrum narrow, moderately deep, 
metathoracicus 
5. All the tibiae yellowish or light testaceous; nervures of wings testa- 
Ceous; front sparselyepunctate Gans. et eee occidentalis 
Middle and hind tibiae more or less blackish; wing nervures blackish. 6 
6. Front rather densely punctate; abdomen distinctly petiolate ....gillettet 
Front sparsely but distinctly punctate; abdomen not distinctly petiolate, 
subsessile; posterior face of propodeum coarsely reticulate, 
SIOUX ENSIS 
Males 
1. Mandibles entirely black; tubercles yellowish; antennal joints 8-12 ser- 
rate “betieatla ei c/i.'s Sale cae rtealel cesta de eke tat yeiaiet eh aera ae 7...maestus 
Mandibles *yellowishvor -wiitishis:-so. 2.0 scl oe en i erent eee 2 
2:-"Pubercles. “black t5.2s.cis 2 stems ee eis ae ee ere cre ner eee TUGOSUS 
Tubercles: yellowish.” bi cee ee oe kcclele cere cite eens eine este occidentalis 
