286 PHYTOPHAGA. 



antennse more than two thirds the length of the body, very robust, the third and three following joints of 

 almost equal length, piceous, the basal joint fulvous ; thorax transverse, of equal width, the sides regu- 

 larly rounded, surface impunctate, the basal sulcation deep ; elytra with the basal portion distinctly 

 raised, bounded below by an oblique depression of darker colour than the thorax, with a very slight bluish 

 gloss, the disk with four double rows of distinct punctures, the interstices of which are rather wider than 

 the rows of punctures and only very slightly raised towards the extreme apex ; knees and base of the tibiae 

 piceous, the two anterior pairs with the usual apical spine ; tarsi greatly dilated. 



Eab. Guatemala, Panima in Vera Paz {Champion). 



The only specimen before me differs sufficiently from P. clarM and P. dohrni to 

 be considered another species. The structural character of the antennae, the regularly 

 geminate striae of the elytra and their flat interstices, will, without difficulty, sepa- 

 rate it. 



5. Plectrotetra proxima. (Tab. XVII. fig. 4.) 



<$ . Fulvous ; antennae very robust, third joint much longer than the fourth ; elytra violaceous blue, very 

 closely subgeminate punctate-striate ; intermediate femora with a strong tooth. 



Length 2| lines. 



Head impunctate, of the usual structure ; antenna? nearly as long as the body, very robust, the third joint very 

 long, the following ones gradually decreasing in length, all the joints covered with fine but rather long 

 hairs at their inner side ; thorax transverse, twice as broad as long, the sides much rounded, anterior 

 angles slightly produced in a very short tooth ; elytra with about ten double rows of closely placed and 

 very distinct punctures, their interstices slightly eostate towards the apex ; legs and tibiae very robust, 

 and the latter as well as the tarsi greatly dilated, the intermediate femora with a robust tooth. 



Hah. Panama, Bugaba {Champion). 



The close punctuation of the elytra in connexion with the robust antennae and the 

 toothed intermediate femora distinguish this species well from the preceding ones. A 

 single specimen was obtained. 



6. Plectrotetra monstrosa. (Tab. xvil. fig. 8.) 



S . Fulvous ; antennae piceous, the basal joint fulvous ; third and fourth joints subequal ; elytra violaceous 

 blue, closely punctate-striate ; intermediate tibiae without spine ; intermediate femora with a long lateral 

 projection at each side. 



Length 2| lines. 



Head impunctate ; antennae nearly as long as the body, very robust, the third joint scarcely longer than the 

 fourth ; thorax longer than usual, not more than one half broader than long, the sides rounded, the 

 anterior angles not produced, surface rather convex, impunctate, the basilar groove very thin, sometimes 

 indistinct ; elytra with about ten distinct and closely placed rows of double punctures, the interstices 

 scarcely convex ; tibiae unarmed ; tarsi not much dilated ; a long spiniform and pointed process is attached 

 to each side at the base of the intermediate femora, protruding beyond the elytra, and visible even from 

 above. 



Hab. Nicaragua [coll. Jacoby), Chontales {Janson). 



The most peculiar femoral process, unlike any thing I am acquainted with amongst 

 the Phytophaga, and the unarmed tibiae, will easily separate this species from its allies. 

 Three males, all of them possessing the above structural characters, are before me ; 

 the female I am not acquainted with. As this long spiny protuberance is attached to 



