long's second expedition. 225 



thorax punctured ; anterior margin, a spot each side near the head, 

 a longitudinal, abbreviated, central line, yellow; scutel with a 

 spot on the disk, and another transverse one beneath its tip, yel- 

 low; wings immaculate, nervures blackish; pectus with a yellow- 

 ish spot over the intermediate and another over the posterior feet; 

 coxae, first joint with a dilated yellow line ; posterior feet elongated ; 

 tergum [334] 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 macularia 

 Fabr., but the longitudinal thoracic line, scutellar spot, the form 

 and number of the bands of the tergum, &c., sufficiently dis- 

 guish it. It is more especially found in Missouri. 



2. C. FERRTIGINEA. — Ferruginous; wings violet; pleura and 

 metathorax black. 



Inhabits United States. 



% Antennae beyond the third joint, gradually shaded into fus- 

 cous ; mandibles, the two teeth black ; thorax, middle segment 

 with a black anterior margin ; posterior segment and scutel, black 

 on each side; wings decidedly violaceous; posterior coxae at base 

 black ; tergum, first segment at base and tip, and second seg- 

 ment at tip, black. 



Length less than three-fifths of an inch. 



3. C. BIPUNCTATA. — Black ; wings dark violaceous ; posterior 

 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 antennae before, yellow ; mandibles piceous ; palpi 

 pale ; collar yellow on the posterior margin, and with the thoinix 

 and scutel with somewhat distant punctures ; wings 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 [335] 

 only yellow; collar destitute of the yellow margin behind. 

 Smaller than the female. 



15 



