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 antennae. 

 In the antennae 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 antennas 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^ (Ce-ram-by-ci'nae). 

 The Typical Cerambycids {Ce-ram 'by-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, RJiagium lineatum 

 (Rha'gi-um lin-e-a'tum). — This is a gray beetle 

 mottled with black, and has a narrow thorax, Fic-69*- 

 with a spine on each side (Fig. 692). It received its name 

 because of the three ridges extending lengthwise on each 



