76 Harry Scott Smith 
tinct than on the remaining segments; first dorsal seg- 
mente immaclates: Mico eeres seek ae ae eee een odyneroides 
21. First dorsal segment of abdomen with punctures but little more 
distinct than on the remaining ones; first dorsal segment 
with a small yellow spot on each side..........% chrysargyrus 
22. Front tarsi abnormal, dilated or at least flattened; antennal 
joints 3 and 6 emarginate, the third about as long as 4 
and 5 united; middle tibial spurs distinct; abdomen mi- 
mitteliy: buts distinctly punctate aslec eat cine oer. oueeetneees 23 
22 eh tonh tarsn moniialsenOtedilated tuts syteieeee oink meee cea eee 24 
23. First joint of median tarsi strongly angular on outer margin, not 
longer than the two following joints united; sculpture of 
mesonotum not exceedingly coarse; usually a yellow spot 
just: back: of ttegulacitee ister crak vecta loci tie eee bigeminus 
23. First joint of median tarsi but slightly angular on the outer mar- 
‘gin, slightly longer than the two following joints united; 
sculpture of mesonotum exceedingly coarse; no yellow 
Spot fuSst back orsterulacs wey ome ee tcc tee cee rufifemur 
24. Middle tibiae without an apical spur; abdomen smooth, im- 
punctate, or at most microscopically punctate; first joint 
of flagellum distinctly longer than the second; fore femora 
Peddishaantemlonhy jest cas ser shei etre hele aaeeneene sexmaculatus 
24. Middle tibiae with an apical spur; abdomen sparsely but 
distinctly, punctate ds yan. oo eee Cerone stirpicolus 
25. Mandibles at apex bidentate, rarely truncate and indistinctly bi- 
dentate; pygidium in female triangular, above flat, never 
deeply excavated and without a well-defined pygidial area, 
the lateral carinae never being highly elevated........... 26 
25. Mandibles at apex tridentate; pygidium narrowed toward apex, 
deeply channeled or excavated, with a well-defined, nar- 
rowed pygidial area, the lateral carinae high; if triangular, 
which us «rare. wexcayvateds ce mere ac carte ee eee tee eee 27 
26. Femora black, yellow distally; head and entire abdomen — 
finely: pEANCtasgen, osc cntece oet oe ee eee ee ee ee bigeminus 
26. Femora reddish; head and first dorsal segment of abdomen 
rather) coarsely. pyinctuneds eee. .njee i eet tee toe rutifemur 
27. Supraorbital foveae wanting or indicated only by a slight glabrous 
streak or depression near the upper border of the eyes... 28 
27. Supraorbital foveae sharply defined, long, linear or oblong; clypeus 
with a median ridge or carina and quadrately produced 
medially, the apex being truncate or subemarginate; head 
large, quadrate, rather coarsely confluently punctate.interruptus 
28. Third antennal joint about as long as 4 and 5 united, or 
nearly three times as long as pedicel; abdomen shining, 
398 
