Nov., 1846.] 127 



spots of black, and is bounded posteriorly by a black zigzag line, 

 the black enlarging towards the suture ; medial and posterior 

 feet pale yellow ; the femora with the middle and the tibice with 

 the terminal half, brown. Apparently allied to E. bimacirfatum, 

 Mels., Proceed. Acad. 2, 307. According to Dr. Le Conte this 

 is the venustum of Dejean's Catalogue. 



7. Heterodromia [Fani. Donaciadae.] Body slender, punc- 

 tate-scabrous : head advanced ; eyes rather prominent, reticulate ; 

 antennre 11-articulate, slender, longer than the head and pro- 

 thorax, first articulation longer than the second and third, last 

 fusiform : mandibles strong, short, incurved : palpi 3-articulate, 

 final articulation subsecuriform, prothorax subelongate, narrowed 

 behind : elytra subparallel, narrowing towards the apex, wider 

 than the prothorax, conjointly rounded at tip : feet slender, sub- 

 elongate, posterior femora incrassate. 



8. H. velox. Thickly punctured, hirsute, pale yellow ; head, 

 anterior margin of the prothorax, and seventh, (at the apex) eighth, 

 ninth and tenth articulations of the antennae, black : elytra lineate 

 punctate, with a tendency to fuscous behind the middle : abdo- 

 men obscure fuscous, feet pale. 4} millim. long. 



Var. a. Having three transverse fuscous dots on the pronotum, 

 and a large sutural fuscous spot at the base of the elytra. 



Found in May, upon grass and under stones and rubbish, in 

 Pennsylvania, Carolina, Alabama and Ohio. It runs with great 

 rapidity, and resembles some of the Carabidae. The species de- 

 scribed might at first view be taken for the Demetrias atricapiUus, 

 Linn. 



9. Trogus nubilt'pennis. Fulvous ; antennae, eyes, vertex, and 

 five terminal segments of the abdomen, with half the preceding 

 one, black : wings fuliginous, mottled with a few spots of yellow 

 in the middle and at the base : mesosternum tipped with black : 

 abdomen shining black beneath : inside of the base of the femora 

 and trochanters blackish : tibiae, tarsi, front and base of the an- 

 tennas beneath, yellow. 11 lines long, expanse 19. 



About a year ago I sent a description and specimen abroad, 

 which seems to differ from the present one, as the segment of the 

 abdomen upon which the two colors meet is described with " ma- 

 cula longitudinali nigra in medio, et nigro-marginato ;" and the 

 wings "fuligine fiavoque nubilatis." There are a few minute 

 white specks upon the alar nervures ; one on the medial, a little 

 within the small intercubital cell; one exterior to the same cell ; 

 and two on the interdiscoidal nervure running from it. 



10. Ibalia macuh'pennis . Yellow ; meso-and metathorax black, 

 except the scutel and two longitudinal bands above, and a spot 

 beneath the wings : eyes, apex of the antennae, base of the coxae, 

 and middle of the femora, (the greater part of the posterior ones) 



