300 APPENDIX. 



curved point nearly as long as the abdomen, but much 

 shorter than the hemelytra ; sides of the thorax posterior 

 to the horns blackish-brown, with an arcuated spot or line 

 behind the horns, and a band near the tip, whitish ; heme- 

 lytra and wings blackish-brown ; beneath blackish j ros- 

 trum^ knees, tibia, and tarsi, whitish. 



Length three-tenths of an inch. 



This is an inhabitant of Pennsylvania, and also of the 

 North-west Territory. It is closely allied to Centrotus 

 bubalus, Fabr. and is infested by Leptus hispidus, nob. 



2. M. trilineata. Brownish-rufous ; thorax elevated on 

 the middle, with three longitudinal, one oblique, and one 

 transverse line, whitish. 



Inhabits North-west Territory. 



Body with rather large dense punctures; head pale 

 greenish-yellow, obsoletely irrorate with brown points; 

 thorax before rounded, unarmed ; a dilated pale greenish 

 vitta from the head, is divided by the rounded elevation 

 near the middle of the back, and passes down on each side 

 in an oblique white line, which terminates at the inferior 

 edge behind the middle; a narrow line on each side passes 

 from the head and terminates at the emargination of the 

 origin of the hemelytra ; a white band near the tip mar- 

 gined with fuscous; dorsal foliaceous elevation taking its 

 rise behind the line of the origin of the hemelytra, its 

 edge very obtusely curved, and gradually disappearing be- 

 hind at the white band, its sides in the middle are abruptly 

 compressed ; tip acute, not attenuated ; hemelytra with a 

 punctured scale at base, which is adjusted in the emargina- 

 tion of the thoracic edge ; coriaceous exterior margin less 

 than one-fourth the length of the hemelytra, and punctured ; 

 beneath yellowish-green. 



Length three-tenths of an inch. 



