POLYPLASTUS. dl5 



the galea curved and very acute , the palpi short and stout. 

 Thorax transverse, the sides sub-angular in the middle, 

 stroDgly narrowed in front, the basal angles slightly pro- 

 minent and obtuse , the base broadly rounded. Scutellum 

 large , triangular , elongate , the sides slightly rounded. 

 Elytra rounded at the sides and apex , the lateral margin 

 a little dilated behind the shoulders, each vrith eight rows 

 of coarse punctures, the humeral and apical callosities very 

 prominent. Pygidium oblique , produced and very convex. 

 Prosternum impressed in the centre , with the margin ele- 

 vated and forming an acute angle between the anterior 

 coxae. Mesosternal process short, broad and obtuse. Legs 

 moderately long , the tarsi slightly longer than the tibiae, 

 the claws equal , anterior tibiae with two smal lateral teeth. 

 The general appearance of the species for which I have 

 found it necessary to characterize this new genus is not 

 unlike some of the R u t e 1 i d a e and it also bears some resem- 

 blance to Pantolia and the allied genera , but the obliquely 

 narrowed humeral angles and absence of a lateral sinus 

 to the elytra and the small mesothoracic epimera indicate 

 decided affinity to the Trie hides and the prominent meso- 

 sternal process , form of the thorax , produced pygidium and 

 sculpture suggest a position for this genus near Platygenia , 

 Myoderma and String ophor us , it differs , however , from 

 all the genera of this sub-family in the armature of the 

 maxillae and form of the prosternum and, with the excep- 

 tion of Inca and Osmoderma, in its elongate triangular 

 scutellum. 



Polyplastus a s s ar iu s , n. sp. 



Head black, clypeus testaceous with the margins black; 

 thorax black , the sides broadly testaceous with an obscure 

 spot near the margin ; scutellum and elytra red-brown or 

 piceous, the latter generally paler towards the apex; pygidium 

 and underside testaceous, meso- and metasternum black; 

 legs and antennae yellowish testaceous , apex of the tibiae 



Notes from, tlie Leyden TMLixsenm, Vol. X. 



