EXEMA. 89 



EXEMA. 



Exema, Lacordaire, Mon. p. 844 (1848). 



This genus was founded by Lacordaire upon the peculiar shape of the antennae, of 

 which the last six joints form a transverse mass ; the tarsi are also more slender than 

 in the genus Chlamys. These characters, however, are of doubtful value, as Lacordaire 

 himself admits. The species are inhabitants of both the New and the Old World, those 

 of the latter comprising only two or three species. 



1. Exema dispar. 



Ewema dispar, Lacord. Mon. p. 850 l ; Dej. Cat. 3rd ed. p. 440. 



Hab. Noeth Ameeica 1 ; Mexico, Guanajuato (E. Duges, coll. SalU); Yucatan 1 ; 

 Guatemala, near the city, Duenas, Zapote, San Geronimo (Champion). 



This species seems to have a rather wide geographical range, having been found in 

 nearly every part of the United States and down to Guatemala. Mr. Champion has sent 

 home numerous specimens, which comprise most of the varieties described by Lacor- ' 

 daire. The species is more or less marked with fulvous ; but the head seems to be 

 entirely of that colour. The elytral tubercles are for the most part isolated ; but even 

 in this respect the species is subject to variation, some specimens having indications 

 of costse connecting the tubercles distinctly visible. 



2. Exema punctatipes. 



Exema punctatipes, Lacord. Mon. p. 853 \ 



Hab. Mexico 1 . — Colombia 1 ; Brazil 1 . 



Lacordaire quotes the above localities of this species as they were labelled accord- 

 ing to Chevrolat, Reiche, and others from whom he received his specimens. It 

 requires, however, confirmation whether the present species is in reality so widely 

 distributed. It belongs to the division in which the thorax has six distinctly elevated 

 ridges extending from the base to the apex ; in the species before us the intervals 

 between the latter are smooth and the ridges isolated. 



3. Exema complicata. 



Elongate, black; antennaa obscure fulvous ; thorax with a high rounded elevation, six-costate ; elytra rugose, 

 subfoveolate, with highly raised short oblique ridges. 



He^id findyriigose punctate, slightly depressed between the eyes ; thorax highly elevated posteriorly, its sides 

 rugose punctate, with six distinct longitudinal costse, which all unite at the base, but the outer ones of 

 which are abbreviated anteriorly, while the preceding are curved outwards at their anterior half; the 

 interstices are irregularly rugose and punctate; and two fine ridges are visible between the posterior 

 portion of the middle costaj ; elytra irregularly rugose and transversely wrinkled, with a series of com- 

 plicated oblique ridges difficult to describe ; a short ridge extending from the middle of the base to the 

 BIOL. CENT.-AMEE., Coleopt., Vol. VI. Pt. 1, J"« 1881. 11 



