102 Dr. A. S. Packard, Jr's Revision oj the 



black ; scutelluni coasely punctured, not striated, on front margin two 

 yellow stripes on each side directed towards the insertion of the wings j 

 postscutellum smooth though not polished, yellow. Propodeum with 

 a narrow sublimate enclosure, with a large, broad mesial furrow; on 

 each side about ten diverging raised ridges of unequal length ; pos- 

 teriori}' are four transverse ridges, with much finer longitudinal lines 

 between ; a slight ridge bounds the sides. Fore femora black above, 

 yellow beneath ; middle femora black, yellow on the outer half be- 

 neath ; hind femora entirely black ; tibiae yellow with a black stripe 

 externally, on hinder tibiae black margined inside with ferruginous, 

 with a yellow stripe; fore tarsi with two basal joints paler whitish tes- 

 taceous, third, fourth and unguinal joints brown black, middle and 

 hind tarsi brown, becoming darker on outer side, and towards ungues. 

 Wings slightly clouded, nervures dull ferruginous, especially on the 

 costal edge, tegulaa ferruginous, hinge pieces blackish. 



Abdomen broad and short, somewhat flattened, not very convex be- 

 neath, with four pairs of fasciae and two terminal continuous bands; 

 two basal fasciae triangular, opposite sides deeply incised, three suc- 

 ceeding pairs entire, slightly sinuate, those on second ring largest and 

 nearer together than any of the others : two continuous bands on the 

 fifth and sixth rings, slightly sinuated. Tip triangular, truncate, 

 minutely hirsute. Beneath black, edges of rings paler, minutely hirsute. 



Length of body, .34; head and thorax together, .19; abdomen, 

 .15 inch. 



Colorado Territory and Illinois, (Coll. Ent. Soc. Phil.). 



A specimen from Illinois has the mandibles yellow externally in the 

 middle, scape of autennae more yellow, popodeum a little more coarsely 

 striated, tibiae more yellow, and abdominal fasciae are twice farther 

 apart; the tip is plainly grooved, where in the specimen from Colo- 

 rado it is faintly marked, so that we may consider the two forms as 

 geographical varieties and as an evidence that the fauna of Colorado 

 Territory is distinct from that of the Mississippi valley. From C. 

 montanus this species which nearly approaches it, may be known by its 

 slightly shorter head, black mandibles, the lower third of the scape 

 being black; by the striated meso-scutum, which in O. montanus is 

 only punctured ; the prothorax is a third broader and on the abdomen 

 the two terminal bands are represented by two pairs of orbicular fas- 

 ciae in C. montanus, which also has nearly black legs. 



Crabro brunneipes. n. sp. 



% . Head cubical; edges rather square, nearly two-thirds as long as 



