180 long's second expedition. 



shorter and more robust, the thorax is destitute of real or appar- 

 ent impressed lines, and the clavae of the thighs are more di- 

 lated. 



DORCATOMA Herbst. 



D. oculata. — Rounded-oval, blackish-brown, a- little hairy; 

 antennae yellowish-piceous. 



Inhabits Pennsylvania. 



Head very obscure piceous ; a few short hairs ; antennae yel- 

 lowish-piceous, first joint large, arcuated; second joint much 

 smaller, rounded ; third, fourth, fifth, still smaller and not very 

 distinctly articulated ; sixth transverse, very short ; seventh much 

 enlarged, on the inner side extending into a conic process, which 

 is nearly as long as the preceding part of the antennae, and when 

 at rest is applied closely to the inner side of the eighth joint and 

 extends quite to its tip; eighth joint elongate-ob triangular; ninth 

 joint as long as the preceding joint, a little arcuated; eyes with 

 an indented, [274] somewhat dilated line, extending from near the 

 base of the antennae to the middle ; thorax punctured, with short 

 hairs, and slightly tinged with piceous ; anterior angles very much 

 decurved and acute ; posterior angles hardly acute ; posterior mar- 

 gin lobed at the scutel ; scutel small, rounded ; elytra punctured 

 and with short hair; exterior submargin with three impressed 

 striae ; beneath punctured, hairy ; feet dull piceous. 



Length one-tenth of an inch. 



The form of the penultimate joint of the antennae differs con- 

 siderably from that of the dresdensis in being much less dilated 

 on the inner side, the seventh joint has the inner process more 

 slender and the terminal joint is a little arcuated. 



NOSODENDRON Latr. 



N. unicolor. — Black, immaculate, antennae piceous, clavum 

 yellowish. 



Inhabits Missouri. 



Head with dense, dilated, shallow punctures ; thorax short, 

 length less than half the breadth ; punctures less dense than those 

 of the head; posterior edge regularly arcuated ; lateral edge hard- 

 ly arcuated, nearly rectilinear ; angles acute ; elytra irregularly 

 punctured ; humerus a little elevated ; humeral angles subacute ; 



