20 Mr. C. 0. Waterliouse on Luccmidce. 



dilated on the outside at the base ; the head is formed 

 ne:irly as in the rT, but with the sides less straight, the 

 anterior angles slightly obtuse, the punctuation is thicker; 

 the thorax is shorter, with the sides completely rounded, 

 the diss is smooth, and the punctuation of the impression 

 finer, the posterior part being finely punctured ; the 

 elytra are geneoiis, the surface is less even ; the anterior 

 tibiae are shorter, broad, with the base fuscous, furnished 

 on the outside with three strong teeth, and one or two 

 smaller ones near the base; the four posterior tibiae are 

 straight, shorter and stouter, the external teeth being 

 stronger. 



Eah. — Peru, (S and $ , in the British Museum. 



Explanation of Plate III. 



Fig. 1. Aulacostethus Archeri ; la, mentum ; 1 b, prostemum. 



2. Chios orjnathus x>eruvianus, $ . 



3. „ „ , ?. 



8c. „ „ , side \iew of mandible of <J , 



