OF PniLADELPniA. 219 



Body yellow : head with a triangular, black, frontal spot : tho- 

 rax, two abbreviated, black, approximate lines, divergent before ; 

 about six black dots on each side : elytra, suture, and five lines 

 on each, black; the interior line is confluent with the suture be- 

 hind ; exterior line marginal ; three intermediate ones joined or 

 approximated at tip : beneath, incisures and three or four series 

 of ventral spots black. 



Length two-fifths of an inch. [454] 



Var. a. Elytra white : the two outer intermediate lines are 

 united at base and tip. 



This species seems to be not uncommon on the Upper Missouri, 

 where it was obtained by Mr. Nuttall and by myself. The 

 variety I found on the Arkausa. 



2. 1). 3-MACULATA. — Bluish-green ; elytra yellow, with a com- 

 mon band, and each with a triangular, black spot near the tip ; 

 feet purplish. 



Inhabits the United States. 



Chri/somehi maculata Mclsh. Catal. 



" (rimacuhita ? Fab. Syst. Eleut. 



Bluish-green, punctured : antennae and pulpi black : elytra 

 punctured in double lines, which become confused near the tip; 

 a dilated, black band extending in breadth from near the base to 

 the middle, not attaining the lateral edge, and often interrupted 

 in the middle of each elytron; a large, triangular spot near the 

 tip of each elytron : beneath black-blue ; feet purplish. 



Length two-fifth of an inch. 



A common insect. 3Ir. Xuttall captured a specimen with the 

 band interrupted into small spots, and the triangular spot near 

 the tip entirely wanting. 



This species is no doubt closely related to Cliri/aom^la trimacu- 

 I'lhi of Fabr., if not the same, which I believe it to be, although 

 that insect is said to be a native of South America, and the 

 tarsi are not rufous as those of that insect are described [455] 

 to be. The terminal joint of the maxillary palpi is very short 

 and transverse ; in this respect, corresponding in character with 

 the palpi of the genus Doryplwra, as defined by Mr. Latrcillc, 

 and, although, as in the preceding species, the prosternum is not 

 remarkably advanced, I prefer arranging it here. 

 1824.] 



