218 INSECTS OP THE CAIRNS DISTRICT, NORTHERN QUEENSLAND, 



narrower than the head, longer than broad, not or scarcely nar- 

 rower at the base than the apex, both truncate, anterior angles a 

 little rounded, the sides a little rounded anteriorly and emarginate 

 before the posterior angles which are very acute, the median line 

 deeply marked, the lateral margins narrow. Elytra broader than 

 the thorax and nearly three times the length, striate, the strise 

 very minutely punctate, the interstices small and nearly flat, 

 without punctures, but with a punctiform impression on the third 

 towards the apex, which last is truncate in the middle and 

 emarginate on each side. 



Length, 3 lines. 

 Hah. — Cairns. 



This insect is undoubtedly a Demetrias, a genus hitherto unknown 

 in Australia, if we except Chaudoir's species D. brachioderics, 

 which I am inclined to believe should be placed in the genus 

 Xantho23hoea. 



9. COLPODES MUCRONATUS. 



Flat, elongate-ovate, bluish-black, very nitid. The elytra of a 

 brilliant bluish-purple. Head longer than broad, not narrower 

 behind the eyes than in front. Eyes prominent, an irregular 

 longitudinal impresssion on each side between the eyes, the 

 antennae haii'y from the middle of the fourth joint. Thorax 

 broader than the length, the apex a little emarginate, the anterior 

 angles rounded; the sides rounded, widest in the middle and 

 broadly and flatly margined, the base truncate and as wide as the 

 apex, and the posterior angles acute and rectangular. The elytra 

 are wide and flat, with about 8 very fine strise minutely punctate, 

 the intei'stices quite flat and smooth, the sides margined and the 

 apex emarginate on each side, and pointed with an acute spine at 

 the suture. The under surface is piceous-black, the tibise and 

 tarsi pale piceous. 



Length, 4 lines. 



Hab. — Mossman River. 



