COLEOPTEBOUS INSECTS. 223 



CHIASOGNATHUS CHILOENSIS. 

 PLATE XVIII. FIG. 1. 



Tetrophthalma chiloensis, Lesson's Ittut. de Zoologic, pi. 24. 

 Chiasognathus Grantii ? Cambridge Phil. Tram. 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 yva6*s, the 

 jaw. 



