APHTHONA. 367 



The larger eyes, slender palpi, and transverse frontal tubercles in connexion with the 

 metallic green and strongly punctured elytra, will assist in distinguishing A. palpalis. 



16. Aphthona chiriquensis. (Tab. XXI. fig. 25.) 



Below dark piceous; head (the vertex excepted), thorax, and the anterior legs fulvous; elytra metallic 

 greenish aeneous, closely and irregularly punctate-striate. 



Length 1 line. 



Head impunctate, the vertex with a transverse anteriorly emarginate blackish band ; eyes large, their inner 

 margin bounded by a groove; frontal tubercles narrow, slightly transverse and distinctly limited behind 

 by an impression ; carina short and broad ; terminal joint of the palpi piceous ; antennae rather short and 

 robust, the six lower joints fulvous, the others black, second and the three following joints short and of 

 nearly equal length ; thorax rather narrow and transverse, the sides slightly, the posterior margin more 

 distinctly, rounded near the angles, surface impunctate, fulvous ; scutellum black ; elytra slightly widened 

 towards the middle and without any basal depression, dark metallic greenish-aeneous, very finely and 

 closely punctured, the punctures arranged in indistinct and rather irregular rows ; posterior legs and 

 tarsi, the apices of the intermediate tibiae, and the underside, piceous. 



Hob. Panama, Volcan de Chiriqui (Champion). 



The colour of the head, the short antennae, and the closely and finely punctured 

 elytra will prevent this species being mistaken for any of the other allied forms described 

 here; the short basal joints of the antennae being peculiar also to the present insect, of 

 which only a single specimen is before me. 



17. Aphthona robusta. 



Subovate, convex, robust, fulvous ; thorax transverse, impunctate ; elytra metallic blue, regularly punctate- 

 striate. 



Length 1| line. 



Head impunctate ; frontal tubercles strongly raised and limited behind by a deep depression ; carina short, 

 acutely raised ; antennae rather robust and of half the length of the body in the male, shorter and thinner 

 in the female, the three lower joints fulvous (sometimes piceous), the others black, the second joint 

 swollen and one half shorter than the third, this and the following joints of nearly equal length; thorax 

 rather narrowly transverse, more than twice as broad as long, the sides very little rounded, the angles 

 not produced, the anterior and posterior margins parallel, the surface rather convex, entirely impunctate, 

 fulvous ; scutellum of the same colour as the thorax, triangular ; elytra convex, widened behind, metallic 

 blue, with a slight and rather obsolete depression below the base, rather strongly and not very closely 

 punctate-striate ; legs fulvous, the posterior femora generally with a piceous or blackish-aeneous spot at 

 their apices, and their metatarsus nearly as long as the three following joints together. 



Hob. Panama, David, Bugaba (Champion). 



The thorax in this species is much more transverse than usual ; the general shape of 

 the insect is also more robust and convex, the elytra being at the same time widened 

 •behind, which is especially the case in the female. I cannot find, however, sufficient 

 ground for separating this species from the genus Aphthona, with which it agrees in all 

 essential points. 



18. Aphthona aterrima. (Tab. XXI. fig. 23.) 



Black ; base of the antennae and of the tibiae obscure fulvous ; thorax impunctate ; elytra finely punctate- 

 striate. 

 Length 1 line. 



