PLECTBOTETRA. 287 



the extreme base of the femora, it follows of course that the insect can move it 

 downwards or sideways with the movements of the legs ; in the usual position of the 

 latter, the process forms a right angle with the mesosternum, and projects beyond the 

 elytra. 



7. Plectrotetra basalis. 



c? . Fulvous below ; antennae piceous or black, third and fourth joints equal ; elytra metallic green or bluish, 

 the base strongly raised, very closely punctate-striate, the sides irregularly punctured ; intermediate tibiae 

 with a spine. 

 $ . Interspaces of the elytra slightly costate. 

 Length 2 lines. 



Hah. Guatemala, Sinanja in Vera Paz (Champion). 



The specific differences to be seen in this species are as follows : — the antennae, which 

 are pubescent at the sides in the male, are nearly black, with the exception of the first 

 joint, which is more or less fulvous, the third and fourth joints are of equal length ; 

 the elytra have the base distinctly raised and bounded below by a transverse depression, 

 and the punctuation is arranged in closely approximating rows, which near the suture 

 assume sometimes an appearance in pairs, but are extremely closely and irregularly 

 arranged near the sides, where the interstices are finely transversely wrinkled, which is 

 best seen when the insect is viewed sideways ; at the extreme apex only a few scattered 

 punctures are seen ; the male has the usual spine near the apex of the last two pairs of 

 tibiae. 



The female from the same locality differs only in the more strongly punctured elytra, 

 the interstices of which are slightly costate anteriorly, and in the thinner antenna? and 

 absence of the spines at the tibiae. 



8. Plectrotetra chiriquensis. (Tab. XVII. fig. 7.) 



c? . Fulvous ; antennae thin, third and fourth joints equal ; elytra obliquely depressed below the base, greenish 

 or bluish, closely punctate-striate, the interstices flat ; sides more irregularly and closely punctured. 



5 . Antennse and legs often piceous or black ; elytra deeply geminate punctate-striate, the interstices slightly 

 costate. 



Length 1|-2| lines. 



Ha6. Panama, Bugaba, Volcan de Chiriqui (Champion). 



In the male of this species the antennae are thin and slender, not pubescent, entirely 

 fulvous, and the third and fourth joints are of equal length, in which respect they 

 resemble P. basalis ; the elytra have the base less distinctly raised and rather more 

 finely punctured • the punctures are closely approached, and show only traces of double 

 rows here and there. In the female the rows of punctures at the elytra are still more 

 closely approached, more deeply impressed, and the interstices more or less distinctly 

 costate. 



From P. basalis the present species differs in the more slender and entirely fulvous 



