LONG HORNED WOOD-BORERS. 
151 
Sab-family PRIONXDES. 
^ The Prionides are generally large, slow-mov- 
ing insects, flying only in the evening, and 
usually of uniform black or brown colors. They 
are distingushed from the other Longicornes 
chiefly by their sub-quadrate thorax, the sides 
of which form a sharp margin, which is usually 
divided iuto two or three teeth. The thighs 
are never clav^te or suddenly enlarged at the 
end, as they are in many of the species of the 
other sub-families. The eyes are usually coarse- 
ly granulated, and the middle cotyloid cavities 
are widely open on the outer side. Some of 
the tropical species are of gigantic size, being 
five or six inches in length. The larva* are 
broad and somewhat flattened, aud have six 
very small but distinct feet. They inhabit the trunks and roots of trees. 
The sub family is named after the genus Prionus, of 
(reolfroy, a term derived from a Greek word meaning a 
saw, and applied to these insects on account of the long 
saw-toothed antenna* of many of the species, especially of 
the males. 
IFig. 73.] 
Prtoxis I.ATICOMJS, Drury : fe 
jmale— after Kiley. 
Larva of Prionus— aftor Riley. 
Pupa of Prionus — 
after Kiley. 
The following are the principal N. American genera : 
A. Ante nme not longer than the thorax ; thoracic margin without teeth ; tarsi eimplo. . . . Parandra 
A A. Antenme much longer than the thorax ; tarsi spongy beneath, with the third joint bilobed. 
h. Eyes coarsely granulated ; oolors uniform. 
C. Thoracic margin prominent ; side pieces of the metasteruum parallel. 
D. Eyes not closely approximate ; antennal joints imbricate ; teeth of the thoracic margin ahort 
and Hat toned. Body robust 
T . J , - Prionus. 
D D. Eyes very large, approximate above aud below ; thoracic teeth spine-shaped. Body elon 
gate. 
E. Thorax much narrowed behind ; margin three epined, the anterior spine shortest. 3d joint 
of tho antenna- as long as tho 4th aud 5th united Dkrouraciujs 
EE. Thorax nearly square j margin 3-spined, the hiudermost spine shortest ; 3d joint of an- 
tenna but little longer than the 4th OrthoSoma 
DDD. Eyes very wide apart, but slightly notched ; size very large; thoracic margin usually 
many toothed. 
F. First joint of antennaj much shorter than the third Erg axes 
