46 
Mr. H. W. Bates on 
articulo prime grosse punctate ; therace quadrate, 
supra scabrese, in medie elevatienibus indistinctis 
duabus leevieribus ; elytris vix nitidis, passim crebre 
minus prefunde punctatis, angulis suturalibus spine- 
sis ; sternis emnibus gresse punctatis, pedibus anticis 
denticulatis, tarsis picee-rufis ; ventris segmentis sin- 
gulis valde cenvexis. 
Leng. (mand. in cl.) 2 unc. 4 lin. 
Very similar in shape and sculpture te M. nohilis, 
Thems., frem Venezuela, the therax being almest exactly 
of the same outline and surface; it differs in being 
entirely black, in the absence of fulvous hairs from the 
epistome, and in the great thickness of the mandibles. 
These organs are much shorter than the head, and are 
abruptly dilated externally, the apex of each ending in 
a long acute point, and the inner edge about the middle 
being advanced, and armed with four short broad teeth, 
nearly as in Mallodon spinibarbis. The elytra have a 
marked convexity from base to apex. 
I met with only one example of this species, at Ega, 
cast up on a sandy beach, after a storm. 
Genus Mallodon. 
Serville; Lacord. Genera, viii. p. 125. 
1. Mallodon spinibarbis, 
Lin. Mus. Lud. Ulr. p. 67. 
M. piceo-niger, elytris castaneis, vel omnino fusco- 
niger, capite grosse punctato, genis sub mandibulis 
prolongatis acutis ; thorace plagis politis septem, in- 
terstitiis in ^ subtiliter crebre punctatis, in ? 
scabrosis; elytris subtilissime sparsim punctatis ; 
processu prosternali piano, S crebre punctato, $ 
glabro. 
A widely-distributed insect, found sometimes in great 
numbers, under the loose bark of felled trees ; it is very 
unstable in the outline of the thorax in both sexes, but it 
may always be distinguished from the nearest allied 
species by the angles of the cheeks below the mandibles 
forming a simple point, instead of being bifid. I have 
specimens from Mexico, Cayenne, and Eio Janeiro, as 
well as from the Amazons. 
