COLEOPTEROUS INSECTS. 
223 
CHIASOGNATHUS CHILOENSIS. 
PLATE XVIII. Fig. 1. 
Tetrophthalma chiloensis, Lesson's Illus. de Zoologic , pi. 24. 
— Chiasognathus Grantii ? Cambridge Phil. Trans, iv. 
pi. 9 and 10. 
This singular genus is characterised by the length 
of the mandibles, which equals or exceeds that of 
the whole body, and by the extraordinary elonga- 
tion of the lowest joint of the antennae, which is 
ornamented with a tuft of hairs at its tip. It was 
established by Mr Stephens on an insect received 
from the island of Chiloe, and its characters pub- 
lished in the Cambridge Philosophical Transactions 
for 1831.* More recently M. Lesson has figured 
an insect which obviously belongs to the same ge- 
nus, although he has thought proper to distinguish 
it by a new name. Indeed it is extremely probable 
that it is the same species as that described by Mr 
Stephens ; but as it differs in a few minute particu- 
lars, it will be better in the mean time to retain its 
distinctive name. Lesson's insect is represented 
by the accompanying figure. The mandibles are 
bronzed green ; the head violet blue ; the thorax 
* The generic name refers to the form of the mandibles, 
which are incurved at the tip, and cross over each other, 
being derived from to lie crosswise , and y*«.6»{, the 
jaw. 
