TETRAMEROUS PLANT-BEETLES. 
109 
(Fig. 62.) 
J 71 
(thi 
or last segment of the abdomen is 
bent vertically downwards, and left 
uncovered by the elytra, furnishing 
an easily distinguishable character 
which is common to nearly all the 
species, except those specified in the 
following synopsis, and which is found 
in none of the other sub-families. The 
antennje are rather distant at their in- 
coscinoptera dominic ana: — rz, larva extracted sertion, sometimes short and serrate, 
from case; 6, do. with case; c, beetle showing, , . , . _ 7 
punctures ; d, same natural size ; e, egg enlarged; DUt) in. tll6 majority at least lialt as 
/, head of larva, under side; a, head of male 1 ^ , T , -. , , , 
beetle; h, jaw of same ; i, eggs natural size; j, long as the body, and very slender 
leg of larva; A;, jaw of same ; l, maxilla of same — ^ t «,•« . 
after Riley. and filiform. The third joint of the 
tarsi is always deeply bilobed. They are all small insects, rarely 
attaining a quarter of an inch in length. All the larvse, we believe, so 
far as known, live upon the surface of leaves, and have the curious 
habit of enclosing themselves in compact cases, composed of their own 
excrement, which they mould into shape by means of their mandibles. 
The same habit of economizing the particles of excrement is practiced 
by many of the small caterpillars belonging to the lepidopterous family 
of Tineidse. The larvre carry their cases about with them, by protru- 
ding the anterior part of their bodies through the open extremity. 
When about to transform they attach their cases to the twigs, and close 
the opening, thus making them answer the purpose of a cocoon. 
A. Anteumc senate or sub-clavate, and shorter than the head and thorax. 
Body elongate; abdomen wholly covered by elytrff; antenna? serrate Anomcea. 
Body short, oval or subcylindric ; tip of abdomen exposed. 
Body short, thick and tuberculous ; antenna? small, sub-clavate and sub-serrate ; legs closely 
contractile Chlamys. 
Body not tuberculous ; antennae free ; legs not contractile. 
Tip ol abdomen scarcely exposed ; elytra smooth and shining, finely punctured ; antenna) 
sub-serrate Bab ia. 
D D. Tip of abdomen fully oxposod; elytra coarsely punctured or pubescent. 
E. Antenna) sub-serrate ; elytra densely punctured Saxinis. 
E E. Antennae serrato; elytra irregularly punctured and pubescent ; mandibles large: 
COSCINOl'TERA. 
Antenna: slender and filitonn, and longer than the head and thorax Cryitockphalus. 
B. 
BB. 
C. 
CC. 
D. 
A A. 
The genus Anomcea , Lacord., has for its type the common A. laticlavia, 
Forster, trom a quarter to a third, of an inch in length, and of a clay- 
yellow color, with the suture and margin of the elytra black. The gene- 
ric name means dissimilar, in allusion to the departure of the species 
irorn the ordinary characters of the sub-family, but their place here is 
determined by the serrate antenna;, and more especially by the case- 
bearing habit of their larvae. Another species very differently colored 
is found in Texas. The species of Chlamys , Kuoch, are of a dark brown 
color, and when their limbs are contracted they resemble little rough 
balls oi inanimate matter. The most common species is the C. plicatu, 
—22 
