FAMILY PRIONIDJS. 115 



in a new and distant land ; and in tliis way, tliis or any <jthcr country may become stocked 

 with new species of insects. In the h>ng run, and with the ever extending intercouse be- 

 tween the ditTerttnt nations of the earth, it is no visionary imagination that the time will 

 come when these beetles will be found in every country where the climate is not decidedly 

 unfavorable to their propagation and existence. 



This group of beetles is divided into three families : 1, the PRioNiDiE, embracing the 

 largest of the group, and provided with very prominent jaws and very long bodies ; 2, the 

 Cerambvcid.e, containing beetles of moderate dimensions, ornamented with a variety of 

 colors ; and, 3, the Lepturid.e, containing insects of a yet smaller size, with bodies dilated 

 before and narrowed behind, and with antennae of a moderate length. 



Pi'ioiiidre. 



Prio.nis PENNsvLVAMcis (Fab.). (Plate xxxiv, fig. 10.) 



Cerambix unicolor (Dniry) ; 

 C. BRTJSNEcs (Forstcr) ; 



C. cYLiNDRicus (Linn.). 



Insect chestnut brown ; head dark chestnut brown. Antennse stout, and two-thirds the 

 length of tlie insect : elytra lighter than the head, extending beyond the abdomen, 

 and nearly three times as long as tlie thorax and head together ; sides parallel ; ab- 

 domen, thighs, and tibise red chestnut. 

 The whole animal is some shade of chestnut brown, but the head and thorax are darker 

 than the elytra. 



Prio.ms laticollis. ( Plate xxvi, fig. 5.) 



Cerambix laticollis (Drury) ; 

 Prioncs brevicornis (Fab.). 

 Insect dark chestnut brown ; head and thorax nearly black. Antennae very stout, consisting 

 of twelve joints : tibise armed internally with two short spines ; tarsi beneath yel- 

 lowish. 

 The insects of both species are light and dark chestnut brown ; almost black in the 

 latter species. Their jaws are stout, and pi< ject ; and their bodies are longer in proportion 

 to the anterior parts, tlie elytra extending a little beyond the abdomen. They belong to the 

 large tribe of Capricorn beetles, and form a family called Prionida, so termed from the 

 structure of the antennae, which are jointed, and give the general appearance of a saw. 

 Some of the tropical species are very large. 



