CERAMBYCIDAE. 809 



Tribe VII. PARISTEMIINI. 



I have adopted the name of this tribe from Lacordaire ; it has 

 two representatives in our fauna; Pteroplatus? floridanus Lee., 

 a black coarsely punctured species, with two narrow orange 

 vittae on the prothorax, and the base and outer margin of the 

 elytra also orange; and Holopleura n. g., found in California. 



The head is moderate, mandibles small, acute, curved ; the eyes 

 large, very deeply emarginate, not very finely granulated, and 

 embracing the base of the antennae rather less than usual, the 

 upper lobe is larger than usual; the front is rather flat, with 

 the transverse suture very deep ; the palpi short, with the last 

 joint cylindrical, truncate at tip; the mentuni is trapezoidal, 

 and more porrect than in neighboring groups, being almost as 

 in Callidium; the antennas (9) are a little more than half as long 

 as the body, stout, serrate, and velvety ; the 1st joint is as long 

 as the 3d, but stouter, the 2d is one-third the size of the 3d, the 4th 

 shorter than the 5th, which is the longest, the following diminish 

 in length. The prothorax is rounded on the sides, truncate in 

 front, bisinuate at base; scutellum variable in form; elytra a little 

 wider from the base, rounded at tip, with the suture, margin, and 

 three discoidal costae elevated, the intermediate costa being the 

 longest; epipleurae well marked, extending to the tip. Pros- 

 ternum narrow between the coxae, which are rounded, with the 

 cavities open behind, and feebly angulated externally ; mesos- 

 ternum flat, triangular, coxal cavities widely open externally; 

 epimera of metathorax moderately wide, parallel. Yentral seg- 

 ments nearly equal. Legs short, slender, thighs not clavate, 

 tibial spurs very small, 1st joint of hind tarsi as long as the two 

 following. 



I cannot see the stridulating organ in the specimens before me. 

 On each side of the pronotum there is an elliptical depressed 

 space, tolerably well denned by an acute edge, which is perhaps 

 sexual. 



This like the following tribe is a transition form ; the 3d joint of 

 the antennae is too large for the series in which I have placed it, 

 but, on the other hand, the front coxae are not transverse as in 

 the Callidioides. It seems to lead off from the latter towards 

 the Stenaspes ; it is easily recognized by the peculiar sculpture, 



