396 PHYTOPHAGA. 



6. Chaetocnema transversicollis. (Tab. XXII. fig. 4.) 



Bobust, subquadrate-ovate, obscure dark aeneous ; antennas piceous, the base fulvous ; head impunctate ; thorax 

 closely and strongly punctured ; elytra deeply punctate-striate, the interstices convex at the sides. 



Length 1 line. 



Head extremely finely granulate, with a few punctures round the inner margin of the eyes only, the space 

 between the latter with a distinct transverse groove, which extends laterally and upwards to the vertex, 

 where it is much deeper and separates the interocular space ; epistome transversely subquadrate, impunc- 

 tate ; labrum and jaws piceous ; antennas nearly half the length of the body, the second and third joints 

 and the base of the fourth fulvous, the rest piceous, the third and fourth joints of equal length ; thorax very 

 transverse, the sides rather strongly deflexed, slightly rounded, surface closely covered with distinct punc- 

 tures, the interspaces granulate like the head ; scutellum greenish, narrowly transverse ; elytra distinctly 

 narrowed at the apex, not wider at the base than the thorax, very deeply punctate-striate, the interstices 

 convex near the sides and apex ; legs piceous ; posterior femora obscure aeneous, the base of their tibiae 

 fulvous. 



Eab. Panama, San Miguel in the Pearl Islands {Champion). 



The robust appearance, transverse thorax, and impunctate head will help to distin- 

 guish C. transversicollis from its allies. 



7. Chaetocnema capitata. (Tab. XXII. fig. 5.) 



Obscure aeneous ; base of the antennae, tibiae, and tarsi testaceous ; head and thorax very strongly punctured ; 



elytra deeply punctate-striate. 

 Length 1 line. 



Hah. Mexico, Guanajuato {Salle) ; Guatemala, San Geronimo {Champion). 



The two specimens before me are of the same robust shape as C. transversicollis and 

 several other allied species, but may be at once distinguished by the strongly punctured 

 head and thorax in connection with the testaceous tibiae and tarsi. The antennae are 

 comparatively short, and have the last four joints of a piceous colour ; the thorax is a 

 little more closely punctured than the head, and has a narrow impunctate longitudinal 

 central space. I am not acquainted with a species of this genus from Central or South 

 America in which the head is so strongly punctured as is the case in the present insect. 

 C. gravida, Baly, is broader, still more robust, of a much darker and very obscure 

 aeneous colour, and the thorax is more closely punctured, the punctures being of a more 

 oblong shape, and not separated by a smooth central space, as is the case in C. capitata. 

 The Mexican specimen has the thorax still more closely punctured (especially near the 

 sides) than in the one from Guatemala ; but as I cannot see any other differences of 

 importance, I believe it to represent the same species. 



8. Chaetocnema cephalotes. 



Obscure aeneous ; legs piceous ; antennae and the posterior tarsi fulvous ; head with a transverse row of punc- 

 tures* ; thorax closely punctured ; elytra strongly punctate-striate. 



Length -| line. 



Head opaque, with a single row of punctures between the eyes, the rest impunctate ; antennae rather long, 

 fulvous, the apical joint fuscous ; thorax transverse, the sides straight and narrowed towards the apex, 

 the surface very closely punctured, the punctures somewhat confluent here and there, but almost disappearing 



