PILEDON.— PLAGIODERA. 189 



Stal gives the size of this insect as 8| millim., which is no doubt a misprint, as neither 

 the specimen named by himself nor any of the others before me is more than 2 lines 

 long, and most of them are only 1-J line. 



2. Phaedon cyanopterum. (Tab. X. fig. 4.) 



Pheedon cyanopterum, Guer. Icon. Regne An. 1838, p. 303 \ 

 Phadon buquetti, Blanch. Hist, de Chili, 1851, p. 548 2 . 



Sab. Mexico (Sturm, coll. SalU). — Chili 1 2 . 



Two specimens from Mexico contained in M. Salle's collection do not show any 

 differences from the Chilian forms, with which I must consider them identical. 



3. Phaedon viride. 



Gastrophysa viridis, Melsh. Proc. Ac. Phil. iii. p. 175. 



Chrysomela viridis, Rogers, Proc. Ac. Phil. 1856, p. 38; Suffrian, Stett. ent. Zeit. 1858, p. 394 3 . 



Sab. Noeth Ameeica 1 2 . — Mexico 3 (1). 



4. Phsedon mexicanum. (Tab. IX. fig. 20.) 



Below black ; basal joint of the antennae, the legs, and last ventral segment obscure fulvous ; head and thorax 

 rufous, the disk of the latter piceous ; elytra blackish blue, punctate-striate. 



Length 1| line. 



Head extremely finely punctured • the clypeus separated from the face by a distinct triangular groove ; antennas 

 with the last four joints thickened and distinctly broader than long, black, the basal joint fulvous; palpi 

 black ; thorax with the sides very slightly rounded ; surface extremely closely and slightly more strongly 

 punctured than the head ; elytra rather strongly punctate-striate, the rows towards the side rather close 

 together, the interstices entirely smooth and impunctate but somewhat convex. Legs obscure fulvous ; 

 tarsi piceous. 



Hab. Mexico, Vera Cruz (SalU). 



Whether this species is but a variety of P. fuscipes, from Colombia, I am unable to 

 say. It differs from that species in the entirely fulvous underside of the thorax and 

 the obsolete (scarcely perceptible) piceous disk of that part, as well as in the smooth 

 elytral interstices. 



PLAGIODERA. 



Plagiodera, Redtenbacher, Fauna Austriaca, 1849, p. 553. 



Plagiodera is a genus of rather peculiar appearance amongst the Chrysomelidse, 

 having often a shape more resembling that of the genus Coccinella, on account of the 

 convex elytra and narrow crescent-shaped thorax. The antennae always end in trans- 

 verse joints, more or less forming a club ; the prosternum is very narrow in the 

 middle, the metasternum, however, very long (not the mesosternum, as Chapuis says,, 

 this part being very short indeed). 



