COLEOPTERA. 
569 
is a large fleshy grub, and infests the roots of grape, apple, 
poplar, and other trees. 
The Tile-horned Prionus, Prionus imbricornis (P. im- 
bri-cor'nis), is very similar to the preceding species, but can 
be distinguished at a glance by the form of the antennas. 
In the antennas of the male the number of the segments 
varies from eighteen to twenty, while in the female the 
number varies from sixteen to seventeen. The popular 
name refers to the fact that the segments of the antennae of 
the male overlap one another like the tiles on a roof. The 
larva infests the roots of grape and pear, and also feeds 
upon the roots of herbaceous plants. 
The Straight-bodied Prionid, Orthosoma brunneum (Or- 
tho-so'ma brun'ne-um), is also a common species. The body 
is long, narrow, and somewhat flattened ; it measures one 
inch to one and one-half inches in length, and is of a light- 
brown color. The prothorax is short, and is armed on each 
side with three sharp spines. The sides of the wing-covers 
are very nearly parallel; this suggests the common name. 
The adult flies by night, and is often attracted to lights; the 
larva is supposed to infest pine. 
Subfamily CERAMBYCIN^E (Ce-ram-by-ci'nae). 
The Typical Cerambycids (Ce-rairiby-cids.) 
In this subfamily the prothorax is rounded on the sides, 
the the tibiae of the fore legs are not grooved, and the palpi 
are never acute at tip. There are nearly four hundred 
American species, representing more than one 
hundred genera. The few species mentioned 
below are those that the beginning student is 
most likely to meet. 
The Ribbed Pine-borer, Rhagium lineatum 
(Rha'gi-um lin-e-a'tum).—This is a gray beetle 
mottled with black, and has a narrow thorax, 
with a spine on each side (Fig. 692). It received 
Fig. 692. 
name 
because of the three ridges extending lengthwise on each 
