172 
THE ORDER OF COLEOPTERA. 
F F. Elytra punctured in rows; size very small, without spots or stripes. 
L. Antennas with eleven joints ; hind tarsi normal. 
M. Hind tibiae robust, and terminated by a bifid spur; body perfectly oval; head 
deeply immersed in the thorax ; size small ; color brassy -black . . .Dibolia 
M M. Hind tibia toothed and furrowed on the outer side ; very small ; blue or 
brassy Ciuetocnbma. 
M M M. Hind tibia normal ; thorax with a deep impression near the base ; color 
dark metallio or reddish Ckicpidodera. 
L L. Antennae ten-jointed ; hind tarsi attached to the side of the tibia : 
f PSYLLIODES. 
Galeruca, Geoff., contains a considerable number of species, some of 
which are common but inconspicuous. Diabrotica, Chovr., has been 
divided into a number of sub genera, agreeing in size and form, but the 
more common species are readily distinguished by their color, Diabro- 
tica proper being usually pale yellow with black spots or stripes, Thyl- 
lobrotica, Dej., being tawny or orange with black spots or stripes, and 
Phyllecthrus being blue black with a yellow thorax. Diabrotica means 
one that gnaws through ; Phyllobrotica, a leaf-gnawer ; and Phyllec- 
thrus, a leaf -enemy ; all of which terms have reference to their leaf-eating 
and often destructive habits. 
The Striped cucumber-beetle is the D. vittata, Fab. 1/uperus, Geoffr., 
also meaning injurious, contains a few small species, some of which are 
of rich metallic colors ; but none of our species are sufficiently numerous 
I to be injurious. Blepharida, Ohev., forms a connecting link between 
Haltica and Clirysomela, having the oval form and distant an ten me of 
the latter, and the enlarged thighs of the former. It contains but two 
species, one of which is the B. rhois , of Forster, a mottled reddish beetle, 
quarter of an inch long, found abundantly on the sumach. (Edionychis, 
Latr., contains many species, most of which do not vary much from a 
quarter of an inch in length. The most common style of coloration is 
that of a yellow thorax and dark metallic elytra, but some are brown 
or yellow with black stripes. In these, as in all the larger Halticini, the 
elytra are irregularly punctured, whilst in most of the small species 
they are punctured in rows. The generic name is expressive ot the 
swollen claw joint. 
Hypolampsus, Clark, contains three N. A. species, the most common 
of which is the H. pilosa, of Illiger. Graptodera , Olievr., is composed 
of a number of dark blue species, one of which is the Haltica ( Grapto- 
dera) chalybea, Illig., the destructive steel-blue flea-beetle of the grape 
vine. Disonycha, Chev., is scarcely distinguishable from (Edionychis 
except in the hind claw joint not being swollen. The species ol the two 
genera, or more properly sub-genera, often closely resemble each other 
in size and color, but in Disonycha the style of coloration is most common 
which is exceptional in (Edionychis, namely, yellow with black stripes ; 
but the most common species is black with a yellow thorax, on which are 
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