S34 APPENDIX. 



gmyi polished', first segment with a rather large, yellow 

 spot on each side, angulated before; second, third, fourth, 

 and fifth, with each a yellow band, slightly interrupted in the 

 middle, and at its termination on each side dilated into a 

 spot; sixth segment dull ochreous; tail piceous. 



Length nearly two-fifths of an inch. 



This insect has considerable resemblance to the macu- 

 laria, Fabr. but the longitudinal thoracic line, scutellar 

 spot, the form and number of the bands of the tergum, &c. 

 sufficiently distinguish it. It is more especially found in 

 Missouri. 



2. Cferruginea. Ferruginous; wings violet j pleura 

 and metathorax black. 



Inhabits United States. 



% Antennas beyond the third joint, gradually shaded 

 into fuscous ; mandibles, the two teeth black ; thorax, 

 middle segment with a black anterior margin ; posterior 

 segment, and scutel, black ofi each side; wbigs decidedly 

 \\o\d,cQOViS; posterior coxse at base black; ^er^t^m, first seg- 

 ment at base and tip, and second segment at tip, black. 



Length less than three-fifths of an inch. 



3. C. bipunctata. Black; wings dark violaceous; pos- 

 terior thighs bright rufous in the middle; a small yellow 

 dot each side at the tip of the metathorax. 



Inhabits United States. 



% Hypostoma, labrum, anterior orbits, and line on the 

 basal joint of the fl!;2^emi« before, yellow; ma7idibles pi- 

 ceous ; palpi pale; collar yellow on the posterior margin, 

 and with the thorax and scutel with somewhat distant 

 punctures; loings violaceous; posterior thighs, excepting 

 at base and tip, bright rufous. 



Length from one-half to three-fourths of an inch. 



9 Hypostoma and labrum black, the anterior orbits 



