393 



EEVISION OF THE AMYCTERIDES. 



Part vii. Hyborrhynehus and Allied Genera 



By Eustace W. rERGUsoN, M.B., Cli.M. 



The present part deals with a small group of genera which present affinities 

 both with the Acantholophus-Cuhicorrhynchus and with the Euomid complexes. 

 The genera here considered include Hyborrhynehus and Anascoptes and two new 

 genera proposed for species formerly included in Hyborrhynehus. 



These four genera possess one feature in common, in that the elytra are 

 so shaped at the base that the distance between the ends of the third inter- 

 stices IS equal in width to the base of the prothorax. The only other genus 

 known to me possessing this character is Dialeiitopus, which is very dissimilar 

 in other respects from Hyborrhynehus and its allies. 



In its general appearance Hyborrhynehus shows considerable resemblance 

 to Aeantholophus, while Anascoptes is more suggestive of the next group — the 

 Euomides. Both these genera have the clypeal plate not deeply sunken but 

 more or less prominently placed at the apex of the rostrum, a character found 

 in most Euomid genera. In the remaining two genera the clypeal plate is 

 contained between the anterior ends of the lateral ridges, though not as deeply 

 sunken as in most of the genera already dealt with in this revision. 



The group seems thus to form a connecting link between these genera and 

 the Euomides, if indeed these last can be regarded as a separate division of 

 the subfamily. 



In its distribution the group appears essentially western and is mostly found 

 in the South West corner of the continent, though one species extends as far 

 east as Sydney. 



The following table will enable the four genera to be distinguished. 



Table of Genera. 



Upper surface of rostrum deeply excavate. 

 Scrobes extending back to eyes. 



Prothorax with lateral margins spinose Htborkhtnchus 



Prothorax elongate, lateral margins not spinose .. .. Neohtborkhtnchus 

 Scrobes ending at some distance in front of eyes .. . .Parahtborbhtnchus 

 Upper rostral surface not deeply excavate, at most feebly concave at base 



Anascoptes 

 Htborbhynchus. 



Maeleay, Trans. Ent. Soc. N.S. Wales, i., 1865, p. 295. 

 Small, elongate, spinose species, in general facies resembling small species 

 of Aeantholophus. 



