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 ; 

 coxce, 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 macula rut 

 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. ferruginea. — 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 coxaa 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 antennas before, yellow ; mandibles piceous ; palpi 

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

 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. 

 <? Hypostoma and labrum black, the anterior orbits [335] 

 only yellow; collar destitute of the yellow margin behind. 

 Smaller than the female. , 



15 



