360 PHTTOPHAGA. 



the second joint very short, the third and the following joints triangularly widened and of nearly equal 

 length • thorax transversely subquadrate, the lateral margin rounded before the middle, anterior and 

 posterior margins nearly straight, all the angles moderately acute and distinct, surface entirely impunctate ; 

 elytra of an obscure dark greenish-aeneous colour, their surface rugosely punctured throughout, their 

 epipleurse very narrow, but continued to the apex; posterior femora moderately but distinctly mcrassate, 

 their tibise with a small spine ; metatarsus as long as the three following joints united; claws appendicu- 

 late ; anterior coxal cavities open. 



Hab. Guatemala, San Geronimo, El Keposo (Champion); Nicaeagua, Chontales 

 (Janson). 



The elongate shape, the narrow epipleurse of the elytra, and the general structural 

 characters of this species induce me to include it in this genus. The antennae differ, 

 however, in their more dilated joints and in being much shorter, which may be but the 

 characteristic of the female sex ; the posterior femora as well as their metatarsus, how- 

 ever, agree with the preceding species entirely, from which the fulvous thorax will at 

 once distinguish L. fulvicollis ; in the specimen from Nicaragua the sides of the thorax 

 are narrowly marked with piceous. 



PTOCADICA. 



Ptocadica, Von Harold, Coleopt. Hefte, xv. 1876, p. 25. 



Von Harold has founded this genus on a species inhabiting Colombia and Peru. The 

 principal characters are to be found in the rounded general shape of the insect, giving 

 it the appearance of a species of Sphceroderma ; there are, however, sufficient different 

 structural characters present to distinguish Ptocadica from the last-named genus; the 

 antennse are of different structure, their joints being gradually elongated up to the 

 fourth or fifth (the terminal joints being lengthened in Sphceroderma) ; the mesosternum 

 instead of being represented by a narrow transverse ridge is here subquadrate, and the 

 structure of the tibia? and legs is again different from the allied genus. Although I 

 have not seen a type specimen of Ptocadica, I must refer an insect obtained by 

 Mr. Champion to Von Harold's genus, with which it seems to agree in every particular. 



l. Ptocadica straminea. 



Ptocadica straminea, Har. Coleopt. Hefte, xv. 1876, p. 26 \ 



Hab. Panama, Volcan de Chiriqui (Champion).— Colombia, Bogota 1 ; Peeu *. 



Two specimens are before me which differ only from the author's description in 

 having testaceous anterior femora and obscure fuscous tarsi ; in other points they agree 

 perfectly. The elytra in the Chiriqui specimens are scarcely visibly punctured. 



APHTHONA. 



Aphthona, Chevrolat, D'Orbigny, Diet. Univ. Hist. Nat. 1842, ii. p. 5 ; Leconte & Horn, Class. 

 Col. N. A. p. 353. 

 No less than eighty-three species are referred to this genus in Gemminger and Von 



