58 INSECTA, 
throughout. They are peculiar to South America, and at a first 
glance resemble Coccinelle and various species of Crytoli. Such 
are those which form the 
Niio, Lat. * 
FAMILY III. 
STENELYTRA. 
The third family of heteromerous Coleoptera only differs from the 
second in the antennze, which are neither granose nor perfoliate, and 
whose extremity, in the greater number, is not thickened. The body 
is most frequently oblong, and arcuated above, and the legs are elon- 
gated asin many other Insects. With the exception of their antennz 
and size, the males resemble the females. ‘These Heteromera are 
usually much more agile than the preceding ones; several conceal 
themselves under the bark of old trees, while most of the others are 
found on leaves and flowers. Most of them were referred by Lin- 
nus to his genus Tenebrio; he distributed the remainder in Necy- 
dalis, Chrysomela, Cerambyz and Cantharis. In the first edition of 
this work, we united these Insects in the single genus Hrnops, but 
their internal as well as external anatomy proves that we may divide 
them into five tribes, attached to as many genera, viz. Helops, Cis- 
tela, Dirczea, Fab., and the Gidemera and Mycterus of Olivier. With 
respect to the biliary vessels, which have a cecal insertion, or the 
posterior ones, we learn from M. Dufour, that this insertion is not 
effected in the two last genera as in the first and other preceding 
heteromera, by a common trunk, but by three canals, one of which is 
simple, the second bifid, and the third trifid. In the C£demerz he 
found salivary vessels. Their head is more or less narrowed and pro- 
longed anteriorly in the form of a snout, and the penultimate joint of 
the tarsi is always bilobate characters which seem to approximate 
these Insects to the Rynchophora. With respect to the alimentary 
canal, and several other considerations, Helops and Cistela approach 
‘Tenebrio, but the Cistelee have a smooth chylife ventricle, entire 
mandibles, and usually live on flowers or leaves, by which they are 
distinguished from Helops. Most of the Dircwe have the faculty of 
leaping, and the penultimate joint of their tarsi; or at least of some, 
is bifid; some of them inhabit mushrooms, others old wood. 
* Lat., Gener. Crust. et Insect., II, p. 198, and I, x, 2; Agithus marginatus, 
Fab. See Germ., Insect. Spec. Nov., p. 162. : 
The genera Eustrophus and Orchesia which we formerly placed in this family 
now belong to the next. 
