LONG-HOENED WOOD-BORERS. 159 



]\fonohammus, Serv., contains ten described species. The antenna? 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 hairs. Certain species with shorter an- 

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

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

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

 hammus, 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 Sa2)f'r(1a, Fab., contains 

 thirteen N. A. si)ecies, including the well known round-headed borer of 

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

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

 an incli long, and of a graj' color; thorax uneven; elytra rough with 

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

 j>ortion by a transverse whitish band. Jjiopus, Serv., contains many 

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

 ])r. LeConte makes the discriminative remark that in this genus and its 

 allies, the lateral tubercle of the thorax becomes more acute and si)ini- 

 form the farther back it is situated. The genus ObereOj 

 Mulsant, contains thirteen species in our fauna, some of 

 n which are injurious to the raspberry, in their larva state, 

 e The other genera given in the preceding table contain but 

 1-^ , 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. cimjula- 

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

 habit of the femaleof 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. AVe have referred 

 OMiuEUKsrixiu'i A above to the twig-pruning habits of the species of Elaphi- 

 Twipfiirdiei; b, (lion amoug the Cerambycides ; but in that case, the 



hole niaile in de- " ^ / i 



positiuK its ejrj:: pruuiug is douc h\ the larvjc, whereas the amT)utation of 

 size— after Kiky. the Oucidercs is performed by the parent insect. Tetrao- 

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

 found on different species of Avsclepias, or milk-weed. They are i)ecu- 

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

 tic States to California. 



