54 
10. 
Dos 
12. 
Clarence E. Mickel 
posterior face of propodeum with scarcely a trace of lateral ridges 
(no distinct transverse series of foveae on propodeum)..nigrifrons 
. Mesonotum finely striated, transversely so on anterior portion, longi- 
tudinally on remainder; first joint of the flagellum longer than the 
two following. Cunitted: DNase soe eit ae ea eee singularis 
Mesonotum not striated, either finely or rugosely punctured ...... 6 
. Pygidium much narrowed apically, depressed or excavated ....... 7 
Pygidium broad, triangular, flat, not depressed or excavated ..... 13 
. Abdomen dorsally indistinctly punctured, or impunctate; pygidium 
always with a lateral fringe of long, thick hairs; head always finely 
and closely punctured; second sternite with large, much scattered 
punctures; propodeum not marked by foveae between the upper 
suntace and’ the spostertor ace: s.:. s.cc.ac.cnss tos ste ocle eterno ene sayi 
Abdomen dorsally distinctly punctured, usually strongly so, particu- 
larly: the whinst TEnoite: 5s sso wteacet, wks steel atic alusstersiore ate eres eae 8 
. Space between the eyes at the base of the clypeus much less than half 
the length of the scape, slightly more than one fourth the length of 
the scape; pygidium with a lateral fringe of stiff hairs; vertex with 
large separated punctures ..... EEE CCIE mee CE RUINS Coosa c banksi 
Space between the eyes at the base of the clypeus equal to about half 
the ‘length’ of the ostape.. o's 6s 9.4 ep inate tow arciaeaie Piast ae 9 
. Pygidium without the lateral fringe of stiff hairs, or it is but feeb 
represented; head with strong, sometimes large, separated punc- 
GUTS mater aie fu ale we teteg omane erate: Aina hana euro tntote cote sah ace sifv age hatte Oye rote tenet y eee gree ar mane 10 
Pygidium with lateral fringe always present and distinct; head with 
Close, rather fine) PUMCEUTES) sss aks. suit, gente tere tere vaste ret bere ee II 
Abdomen with tergites two, four and five banded with yellow; first 
tergite very strongly punctured; third tergite with a small, lateral 
SOM Se One Oa Oe Ean CoD Ui obamatminioawon es nonmado Gone Apo us texanus 
Abdomen never banded, with a lateral spot on tergites two, four and 
five, the third tergite rarely spotted; first tergite not very strongly 
MUNCHUTEH., 4 Yl wedcmees 4 oe 7 deo ele Raa ee ee cree stirpicolus 
Mesonotum with strong punctures, separated on posterior portion; 
abdominal spots nearly always all widely separated, rarely forming 
bands on the last two tergites; propodeum strongly punctured above 
(femora in part! reddish, trochanters black) ....... decemmaculatus 
Mesonotum closely and rather finely punctured throughout; abdomen 
always more or less banded; propodeum striated above ....... I2 
First tergite with the punctuation much more distinct than on the re- 
maining tergites; first tergite and the sternites not spotted, 
odyneroides 
First tergite with the punctuation but little more distinct than on the 
remaining tergites; femora black except the apex; sternites not 
mactiated: \: q:jeyxdid esate velo owe eae ches oe eam chrysargynus 
