436 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Female. — Head. — Black; the following parts yellow, some- 
times pale yellow: clypeus, labium, mandibles, lower half to two- 
thirds of cheek, lower orbit, front below antennae, anteriormost 
portion of supra-antennal ridges, and a short line (narrowing as a 
rule toward anterior end) at the summit of the inner orbit (rarely 
this line is shorter than usual and appears as a small elongate 
spot). Head behind eyes somewhat narrower than through 
them (difference sometimes slight); supra-antennal ridges gen- 
erally fairly prominent. 
Thorax. — Black; the following parts yellow, or pale yellow: 
prosternum, ventral face of propleura and usually the lower por- 
tion of the lateral face, margin of pronotum except dorsally and 
as a rule broadening out on the posterior dorsal margin of the 
lobes of collar, as a rule a spot on the lower portion of the 
lateral face of the pronotum (usually large, taking in the greater 
part of same), tegulae, the upper margin of the meso-epimeron 
(sometimes only in part), a narrow band on the lower limit of the 
posterior half of the meso-episternum which broadens out into a 
large angular spot on the anterior half and which extends some- 
what on the pectus (rarely the band on posterior half absent), 
variable posterior mesal portion of pectus, the upper margin of the 
meta-epimeron narrowly, meta-episternum entirely, or nearly so. 
Mesoscutellum generally fairly strongly convex; meso-epister- 
num moderately sharply pointed. 
Abdomen. — Ferruginous ; four basal terga and as a rule the 
slender portion of the sheath of the ovipositor black; sides of 
from two to four basal terga, and basal half of venter (some- 
times slightly more and sometimes slightly less) yellowish. 
Legs. — Yellowish (brownish toward the extremities, the 
posterior tibiae and tarsi especially as a rule) ; the following parts 
black: middle coxae slightly at base above and sometimes a very 
small spot at apex above, posterior slightly at base above and 
outside and a small spot at apex above, small spots on the pos- 
terior trochanters above and rarely the same on the intermediate, 
a short longitudinal band on the anterior femora at apex above 
(rarely reduced to a spot and rarely again continued narrowly 
nearly to base), a longitudinal band on the intermediate femora 
above, and approximately the apical half to two-thirds of the 
