226 ACADEMY OF NATURAL SCIENCES 



margined witli rufous : terminal joint of the posterior tarsi gib- 

 bous near tbe claws. 



Length nearly one-fourth of an inch. 



[Belongs to Oedionycliis, and previously described by Illiger 

 under the same name. — Lec] 



3. A. SCRIPTICOLLTS. — Black; thorax yellowish, with a trans- 

 verse, undulated spot ; venter yellow. 



Inhabits Missouri. 



Body oval, black, glabrous, minutely punctured : head with a 

 transverse, rufous, frontal spot, and another very small one at the 

 base of each antenna : thorax yellow ; a transverse, undulated, 

 spot occupying more than two-thirds of the transverse diameter : 

 scutel impunctured, rounded at tip : elytra black, immaculate ; 

 pectus yellowish : venter pale yellowish; terminal joint of the 

 posterior tarsi gibbous near the claws. 



Length nearly one-fourth of an inch. 



Very like the preceding, but may be distinguished by the 

 frontal spot, and by the u^ndulated, litterate form of the thoracic 

 spot. 



[Belongs to Oedionychu. — Lec] 



4. A. TRIANGULARIS. — Black ; thorax yellowish, with three 

 black points placed triangularly. 



Inhabits Missouri. 



Body oval, black, glabrous : thorax yellowish, with three black 

 points placed triangularly, the two anterior ones orbicular, tbe 

 posterior one linear, very short : elytra violaceous-black, and as 

 well as the thorax, minutely punctured : pectus, excepting the 

 origin of the feet, yellow ; terminal joint of the tarsi simple. [85] 



Length about one-fourth of an inch. 



Remarkable by the triangular position of the black thoracic 

 points. 



5. A. BiMARGiNATA. — Blue J thorax with an impressed trans- 

 verse line; elytra with a much elevated line near the margin. 



Inhabits Missouri. 



Body oblong-oval, blue, minutely punctured : antennse black : 

 thorax with an impressed, transverse, rectilinear line behind the 

 middle, attaining the lateral margins, and another impressed 

 line before, which is intermpted in the middle and abbreviated 



[Vol. IV. 



