290 PHYTOPHAGA. 



towards the apex; the third joint is also of nearly twice the length of the second. The 

 elytra have distinct and closely approximating rows of punctures, which are arranged 

 in pairs from the third row, the first three sutural rows consisting of single punctures 

 only ; towards the apex the interstices are slightly convex ; the underside and legs are 

 black, which will further help to distinguish this species. 



Two female specimens from the same locality differ in having the first three or four 

 joints of the antennas fulvous, and the punctures at the sides of the elytra rather more 

 strongly impressed and the interstices rugose ; but these females are scarcely to be 

 distinguished from those of P. chiriquensis, with which they may possibly be identical. 



14. Plectrotetra rugosa. 



c?. Fulvous; antennse slender, third and fourth joints equal; elytra bluish green, rugose-punctate, the inter- 

 stices longitudinally costate. 

 2 . Elytra more strongly punctured and costate, each elytron with three more highly raised costas. 

 Length 2-2| lines. 



Hab. Mexico, Guanajuato (Salle) ; Guatemala (coll. Jacoby) ; Panama, Bugaba 

 (Champion). 



The only species with which the present one can be compared is P. clarki, which some- 

 what resembles it in the elytral sculpture ; the latter in P. rugosa is, however, still 

 more coarse and irregular, and the punctures are not so regularly arranged in lines, the 

 interstices are nearly everywhere transversely rugose and interrupted by numerous 

 more or less distinctly raised longitudinal costse; the antennae are, however, quite 

 distinct from P. clarki ; they are not robust nor thickened at the base, shorter, and the 

 third and fourth joints are of equal length *. In the female the elytra are rather more 

 strongly punctured, and of the costse three more highly raised than the others are 

 visible near the sides. The Mexican specimens differ in their smaller and more parallel 

 size and the less rugosely punctate elytra ; but the differences do not seem sufficient to 

 be considered specific, as in other respects they agree with the Guatemalan insects. 



15. Plectrotetra hirsuta. 



2 . Fulvous ; antennae slender, third and following joints equal ; elytra obscure metallic green, subopaque, 



closely and finely pubescent, geminate punctate-striate, the extreme apex slightly excavated. 

 Length 2 lines. 



Hab. Panama, Volcan de Chiriqui (Champion). 



The two female specimens obtained by Mr. Champion are easily distinguished by the 

 fine and close greyish pubescence which covers principally the distal two thirds of the 

 elytra, and gives to the latter an opaque appearance ; the base is not raised, and more 

 shining than the rest of the surface ; near the sutural margin the interstices are slightly 

 convex ; the extreme apex is, however, devoid of any costse, and has only a few punctures, 



* The tarsi are as usually much dilated, and the intermediate tibiae are armed with a long spine. 



