APPKNDIX— C. 



PLATYPSYLLUS CASTORIS. 



By C. V. Rli,EY. 



' ' A glance at the illustrations which I have prepared will show 

 the prevailing characteristics of this interesting creature, its general 

 ovoid and flattened form, and more particularly the flattened semi- 

 circular head. Dorsally, we notice the rather prominent occiput 

 fringed behind with short and broad depressed spines or teeth which 

 form a sort of comb, the prothorax trapezoidal and but very slightly 

 curved, with side margins strongly grooved. There is a very dis- 

 tinct scutellum, and the two elytra are rounded at the tip and with- 

 out venation. Hind wings and eyes are both wanting. The abdo- 

 men shows five segments, each with a row of depressed bristles." 



