458 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
a very narrow complete or partial inner orbit and sometimes only 
a minute elongate spot at the summit; palpi usually reddish in 
part. Head behind eyes as wide as through them, sometimes 
slightly narrower; vertex-plate distinctly wider than long; supra- 
antennal ridges from moderately to fairly prominent, but some- 
times only at base of antennae; antennae as a rule but slightly 
longer than the head and thorax. 
Thorax. — Dull ferruginous (tcgulae paler, and usually yel- 
low-brown); the following parts black: the whole pro thorax 
except the posterior dorsal margin of lobes of collar (and often 
this is yellowish), a spot of variable size on the anterior portion 
of the prescutum, and a usually larger spot on each side of the 
mesoscutum, posterior margin of mesoscutellum, meso-epimeron 
from lower half to entirely, a narrow longitudinal band as a rule 
on the anterior portion or on the whole length of the' meso-epi- 
sternum along and touching the meso-epimeron (rarely the meso- 
episternum in greater part), pectus (the black as a rule extends 
somewhat on the posterior portion of the meso-episternum), meta- 
scutum anterior to cenchri, metascutellum sometimes from in 
part to entirely, the lower half of the meta-epimeron to entirely, 
meta-episternum, and the meta-postscutellum at its juncture 
with the abdomen; meta-episternum with a pale yellow spot. 
Mesoscutellum only slightly, but sometimes fairly strongly con- 
vex; meso-episternum rather blunt. 
Abdomen. — Ferruginous, or dull ferruginous; the following 
parts black: rarely the posterior portion of the basal tergum, the 
second, third and fourth terga from solidly to only at their 
junctures, but as a rule more or less solidly, the three basal seg- 
ments of the venter and variably and irregularly beyond (rarely 
practically the whole venter), and the sheath of the o\"ipositor in 
part or entirely; sides of basal tergum yellowish white. 
Legs. — Pale ferruginous (tarsi usually still paler); the follow- 
ing parts black: anterior coxae (rarely irregularly), middle and 
posterior coxae irregularly but sometimes entirely, trochanters 
usually with a variable amount above and sometimes entirely, 
femora very slightly at base above, the anterior and intermediate 
at apex above, and the apical fourth to one-third of the posterior 
(rarely the black at base and apex on all femora united), middle 
