LONG-HORNED WOOD-BORERS. 
159 
Monohammus, Serv., contains ten described species. The antenna 1 , 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- 
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- 
dcs, Serv., not given in the table, has most of the characters of Mono- 
hamraus, bnt 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 Scvperda, Fab., contains 
thirteen N. A. species, including the well known rouudlieaded borer of 
the apple tree. Leptostylus, LeC., contains ten species, the most com- 
mon of which is the L. acnUferun , 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 ancj spini- 
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 bnt 
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 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. We have referred 
0 TUB E sa 9CI - G Th« a1aove to tlle twig-pruning habits of the species of Elaphi- 
h^maae'i^de'. t ^ on a,non S the Ceraiubycides ; but in that case, the 
posaiuK a« egg; pruning is done by the larvae, whereas the amputation of 
size alter itiiey . the Oncideres is performed by the parent insect. Tetrao- 
V es , Dalman, contains the well known brick-red beetles with black spots, 
found on different species of Asclepias, or milk-weed. They are pecu- 
liarly N. American, the species being widely distributed from the Atlan- 
tic States to California. 
