TETRAMEROTJS PLANT-BEETLES. 
1T3 
three black dots arranged in a 
triangle; length a quarter of an 
inch ; this is the D. triangularis, 
Say. Another species liable to 
be confounded with this is the 
D. collaris, Fab., but in this the 
thorax is yellow without spots, 
and the under side of the ab- 
domen is dull yellow. Orchcs- 
tris, Kirby, is the genus which 
contains the common cabbage 
and turnip flea-beetle, aud its 
allies. They are about one-tenth 
of an inch loug, black, with a 
broad waving yellow stripe 
along the middle of each wing- 
cover. Species closely resern- 
IIaltica (Ghaptodeka) chalybea, Bliger: — The Grape- , 
Tine flea-beet, le ; a, grape leaf ent-en by yonng lnrvie ; b, Ollllg eaCU OtUer ai 6 equally 
larva, magnified ; earthen cell, in which the inaect 0 >i< 1 Bosti'iipfi vc in 
transforms ; d, beetle— after Riley. abundant and ueSU UCU1V6 111 
generic name means a dancer 
(Kg. 87. 
destructive 
Europe and in this country. The generic name means a dancer or 
jumper. Longitarsus, Latr., contains many small and closely allied spe- 
cies of a brownish color, and distinguished as the name implies by the 
greatly elongated first joint of the hind tarsi. Systcna, Chev., 
is most readily distinguished by the elongate, narrow form of 
the species. The Systena blanda, Melsh., an eighth of an inch 
long, pale yellow with three darker stripes, has been found to 
be destructive to young corn, in the Middle States. The other 
genera in the table are composed of very small species, distin- halticacha. 
guished from the foregoing by having the elytra punctured showing the 
in rows. Dibolia, Chev., contains but one-known species, the rior thighs. 
D. aerea, Melsh., or brassy Dibolia, a tenth of an inch or a little more in 
length and of a brassy black color; found in the Middle and Southern 
States. The species of Chcetocnema , Stephens, are found mostly in the 
Southern States and Texas. Crepidodera, Chev., contains many very 
small, usually black or reddish species; but one of the most common, 
the C. lielxines, Linn., is sometimes purple and at others brassy green. 
This little species is said to be common to Europe and this country. The 
little Cucumber flea-beetle, Haltica cucumeris, of Ilarris, has been placed, 
in company with a few others, in a separate sub-genus Epitrix, Foudr., 
on account of their pubescent surface. But few species of the little 
genus Psylliodes, Latr., have been observed. Dr. Fitch refers to'one of 
them, the P. punctulata, Melsh., as being somewhat injurious to the 
leaves of several kinds of garden vegetables. The generic name is de- 
