LONG-HORNED WOOD-BORERS. 159 



MonoJiamnius, Serv., contains ten described species. The antennse of 

 the males are about twice as long as the body, and in some species more 

 than this, and the anterior legs are longer than the others, and their 

 tarsi are strongly fringed with bairs. Certain species with shorter an- 

 tennae, and with the fore-legs of the males not elongated, have been sep- 

 arated by LeOonte in the genus or sub-genus Goes. The genus Ptycho- 

 des, Serv., not given in the table, has most of the characters of Mono- 

 hamraus, but the thorax is rounded at the sides and without a lateral 

 spine; but one species inhabits the United States; two others are found 

 in Mexico and Central America. The genus Sajierda, Fab., contains 

 thirteen N. A. species, including the well known round-headed borer of 

 the apple tree. Leiitosiylus^ LeC, contains ten species, the most com- 

 mon of which is the L. aculiferus^ Say, between three and four-tenths of 

 an inch long, and of a gray color; thorax uneven; elytra rough with 

 elevated points, with a brownish tip which is separated from the gray 

 portion by a transverse whitish band. Liopus, Serv., contains many 

 small species not averaging more than a quarter of an inch in length. 

 Dr. LeConte makes the discriminative remark that in this genus and its 

 allies, the lateral tubercle of the thorax becomes more acute and spini- 

 [Fig. 78.] form the farther back it is situated. The genus Oberea, 

 Mulsant, contains thirteen species in our fauna, some of 

 Q which are injurious to the raspberry, in their larva state. 

 e The other genera given in the preceding table contain but 

 ^ , few species. Oncideres, Serv., contains three North Amer- 

 ican and many South American species. The only spe- 

 cies found east of the Mississippi river is the 0. cingula- 

 tus, Say, commonly known as the Twig-girdler, from the 

 habit of the female of girdling twigs below the point where 

 she has deposited her eggs. It usually breeds in the hick- 

 ory, but it has been known to girdle the twigs of the ap- 

 ple, the pear, and the persimmon. We have referred 

 Oncideres ciNGUT,A- above to the twig-pruuiug habits of the species of Elaphi- 

 hdl^nfde^in'd''' ^^^^ amoug the Cerambycides ; but in that case, the 

 positing its egg; pruning is done by the larvae, whereas the amputation of 



e, egg, natural o ./ 7 x- 



size— after Riley, the Oucidcres is i^crformed by the parent insect. Tetrao- 

 pes, Dalman, contains the well known brick-red beetles with black spots, 

 found on different species of Asclepias, or milk- weed. They are pecu- 

 liarly IST. American, the species being widely distributed from the Atlan- 

 tic States to California. 



