NATURAL SCIENCES OF PHILADELPHIA. 
69 
P. cavata is a small species (-7 inch, long) found in Alabama hy Mr. Hentz, 
and given me by Prof. Haldeman. 
P. obtusa is a still smaller species (-48 inch long), found near Philadelphia 
and given me by Mr. Newman. The sides of the thorax are strongly angulated, 
and the elytra are not attenuated, but are parallel on the sides, and obtusely 
rounded behind. 
ACM^^ODERA Esch. 
A. semivittata, seneo-nigra nitida, pube erecta hispida, fronte canalicu- 
lata, thorace dense punctato, antrorsum angustato, lateribus rotundatis flavo- 
marginatis, profunde oblique et in medio late triangulariter excavato, canalicu- 
lato ; elytris vittis duabus, lineisque reticulatis flavis paucis pone medium, 
maculis nigris includentibus ornatis, punctato-striatis, striis postice impressis, 
interstitiis uniseriatim punctatis. Long. -34 — -45. 
Eagle Pass, Texas, Mr. Schott. The yellow lines vary in width, so that the 
included spots are more or less numerous, but the extreme tip is always black. 
The spots are usually placed ; two transverse ones on the suture, and five on 
the margin ; of the vittse, one is marginal, and the other dorsal, somewhat 
nearer the suture than the margin. The form of body is like that of A. p u 1- 
i; h e 1 1 a . 
A. haemorrhoa, elongata, cuneiformis, nigro-fenea nitida, pube erecta 
liispida, capite canaliculate, thoraceque dense punctatis hoc lateribus anticc 
rotundatis, antrorsum valde angustato, puncto laterali tiavo ornato, ad latera 
oblique, et medio triangulariter valde profunde excavato et canaliculato ; elytris 
violaceo-nigris, humeris prominulis punctis flavis plurimis confluentibus orna- 
tis, ad apicem minio marginatis ; punctato-striatis, interstitiis uniseriatim 
punctatis. Long. '4 — "45. 
Laredo to Ringgold Barracks, Mr. Schott. Resembles the figure of A. s t e 1 - 
laris Che.vr. (Col. Mex. 2nd cent. 89), as given in the monograph of Messrs. 
Gory and Laporte, but the apical red margin of the elytra is not mentioned. 
A. g i b b u 1 a , nigro-fenea, supra pilis pallidis parce vestita, thorace confer- 
tim punctato, antrorsum angustato, lateribus parum rotundatis, medio trian^ 
gulariter excavato, versus basin utrinque late et profunde foveato ; elytris 
cyaneo-nigris, humeris valde callosis, maculis pluribus magnis flavis ornatis, 
posticis versus latera rufo-tinctis ; fortiter punctato-striatis, striis postice exa- 
ratis, Imo antice fere obliterata, interstitiis subtiliter uniseriatim j)unctulatis ; 
subtus ad latera valde albo-i^ilosa. Long. -5. 
Found by Dr. Webb on the journey from San Diego to El Paso. The elytra 
of the male are gradually narrowed behind, and sinuate on the sides ; those of 
the female are subparallel, and very slightly sinuate, obliquely narrowed at 
the apex : the discoidal spots are from five to seven in number, and form a 
series on the 3d, 4th, and 5th interstices, some of them being wider and some 
narrower ; the other sx^ots are placed, a humeral dot, three marginal spots 
occupying two intervals, and finally three spots on the third interval from the 
margin ; of these last the two posterior are tinged with red. 
A. opacula, cuneiformis, supra nigra opaca, pilis erectis hispida, thorace 
]jrevi, dense punctato, antrorsum angustafo, lateribus fortiter marginatis ro- 
tundatis flavis, margine nigro ; ad medium late et profunde triangulariter 
excavato versus latera oblique impresso ; elytris humeris callosis, maculis 
pluribus flavis, posticis rufo-tinctis, ornatis, ad apicem acutius attenuatis, striis 
fortiter punctatis, interstitiis angustis uniseriatim punctatis ; subtus nigro- 
a3nea, parce pubescens. Long. -42. 
One specimen El Paso, Mr. Clark. The strongly margined sides of the thorax 
will readily distinguish this species ; the spaces between the rows of punctures 
of the elytra are hardly greater than the distances between the punctures in 
the rows ; the spots are a marginal elongate one near the humerus, another 
larger marginal about the middle which includes a black spot ; a basal dot on 
the third interval two spots before the middle extending from the second to 
1858.] 
