Genera of the Cossonida. 5G7 



than even the last genus does, for the inner anguliform 

 projection which is so conspicuous a feature in Glceotrogus\ 

 added to its abbreviated funiculus, its greatly enlarged 

 capitulum, its elongate, oval, much exserted head, and the 

 fact of its large but depressed eyes being considerably 

 approximated on the underside, affiliating it unmistakeably 

 with the small assemblage of types which appear to be 

 characteristic of the islands of the Malayan archipelago. 



As compared with Homalotrogus, the present genus is 

 remarkable for the body being both larger and very much 

 more deeply and coarsely sculptured ; for its rostrum being 

 more parallel (i. e. much less contracted behind, and there- 

 fore less expanded in front) ; for its head being a little 

 thicker (or less narrowed) ; for its antennae (which are 

 more strictly medial as regards their insertion, instead of 

 ante-medial) having their scape rather more evidently 

 sinuated internally, and their second funiculus-joint not in 

 the slightest degree lengthened ; and for its prothorax 

 being longer, or more oblong, and more decidedly tri- 

 sinuated along its basal edge. The two species from which 

 my generic diagnosis has been compiled were collected by 

 Mr. Wallace in the island of Batchian. 



83. HETEROPHASIS. (nov. gen.\ The very beautiful 

 insect, so remarkable for its rufescent prothorax, and the 

 other, totally dark one, on which the present genus is 

 established, are from the collection of Mr. Pascoe, and 

 were captured by Mr. Wallace at Dorey in New Guinea. 

 In the more ordinary .construction of their rostrum and 

 antennae they make a still nearer approach to Cossonus 

 than the members of any of the three preceding groups. 

 Nevertheless I think they may fairly be separated from 

 the true Cossoni, from which they may be said to differ 

 not only in their surface being at times more elegantly 

 coloured (a fact of great significance in this department of 

 the Rhyncophora), but likewise (which is equally im- 

 portant) in their more fusiform, or less parallel, outline, 

 their extremely depressed surface (in which respect they 

 agree with the three preceding genera), their rather more 

 prominent eyes, and in their prothorax (which is alike 

 free from a keel and a depression) being almost totally 

 unsculptured with the exception of being impressed down 

 either side of its central region (and in the anterior con- 

 striction) with a row of punctures which in H. ruficollis 

 are extremely large, but almost obsolete in the concolor. 



