AMERICAN COLEOPTERA. 119 



and at the broadest part nearly equal to one and a half times the 

 width of the base. 



P. bicolor, Lee. (Ebceus) Proc. Acad. 1852, p. 167. — Similar to the preced- 

 ing, but with the thorax more rounded on the sides, scarcely narrowed to base 

 and shorter. Head yellowish-red but darker than the thorax. 



Male. — Terminal abdominal segment black, not prolonged nor grooved, 

 broadly emarginate at tip. Elytra yellow at tip. 



Female. — Terminal segment broadly oval at tip. 



Similar in size and color to apicalis and occurring with it. 



P. ptisillus. Say (Malachius) Journ. Acad. Ser. i. v., p. 170; Lee. (Ebceus) 

 Proc. Acad. 1852, p. 167. 



Resembles bicolor in form, but has the upper surface entirely black. 

 Legs pale yellowish testaceous, femora at base piceous. 



In sexual characters this species resembles bicolor, but the terminal 

 segment in the male appears to be nearly rounded and not emarginate. 



P. oblitus, Lee. (Ebceus) Proc. Acad. 1852, p. 167. 



Color above totally black, antennae at base and legs pale yellowish 

 testaceous. Resembles pusillus in color, but has the thorax somewhat 

 narrowed behind as in apicalis. Agrees with the latter also in its 

 sexual characters, having the terminal abdominal segment of the male 

 prolonged, channelled and deeply emarginate at tip, as well as pale 

 yellowish testaceous in color. 



Similar in size to apicalis. Occurs from Canada to Georgia. 



ATTAINS, Er. 



Attalus, Er. Entom. i., 1840, p. 89. 

 Acletus, Lee. Proc. Acad. 1852, p. 167. 

 Scalopterus, Motsch. Bull. Mosc. 1859, iv., p. 406. 



This genus is well denned in our fauna and may be distinguished 

 from all those with similar antennal insertion by the dissimilarity of 

 the tarsi in the two sexes; the second joint of the anterior tarsus of 

 the male being prolonged over the third and grooved beneath. As 

 has been already noticed in the beginning of this essay there exists a 

 very great freedom of motion between the second and third joints so 

 that while the first two joints may be in a line with the tibiae the last 

 three may be bent inwards at a right angle. 



The species of this genus are numerous and difficult to separate, the 

 following table will assist in their determination : 

 Head elongate (as in Tanaops) longer than wide. Front nearly flat. 

 Thorax entirely rufous. 



Head entirely black; elytra sub-opaque rostratus. 



Occiput only black; elytra shining trimaculatus. 



