CRYPTARCHA. 381 
other parts of the upper surface is very striking. The mandibles are very unequal, the 
right one being greatly prolonged and bent. The head is large, acuminate in front, the 
sides very slightly sinuate. The thorax is large, shining, the punctuation on the disc very 
distant and fine, coarser towards the sides. The elytra have a greasy appearance, and 
the interstitial punctuation is—though seriate—distinct from the serial punctuation, 
being finer and more remote. The pygidium is elongate, subacuminate. 
17. Cryptarcha clavigera, sp. n. 
Breviter ovalis, sat convexa, ferruginea, supra nigro-submaculata, crebrius subtiliter punctata et pubescens ; 
antennarum clava magna, fusca. 
Long. 33 millim. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith); Panama, Caldera in Chiriqui 
(Champion). 
This insect agrees with C. discedens in the unusual size of the club of the antenna, as 
well as in the colour thereof, which is not black, but unicolorous fuscous ; C. clavigera 
is, however, a short, broader insect than C. discedens, has considerably finer punctuation, 
and the upper surface is marked with black, though not very definitely or conspicuously. 
The punctuation of the head is fine and not close, that of the thorax fine and close ; 
the punctuation of the elytra is very fine, and in fact is concealed by the numerous 
series of fine hairs. The pygidium is broad and largely exposed. The thorax has four, 
the elytra several, black marks, but these are indefinite and may not be constant. 
One specimen from each locality. 
18. Cryptarcha discedens, sp. n. (Lab. XII. fig. 15.) 
Oblongo-ovalis, sat convexa, pubescens, sat fortiter punctata, subopaca, ferruginea; antennis clava magna, 
articulo ultimo majore; elytris crebrius subseriatim punctatis. 
Long. + millim. 
Hab. GuatEMALa, Cerro Zunil (Champion). 
Mandibles short, similar, toothed a little before the extremity. Antenne with the 
club large, not black, only fuscous, the terminal joint unusually large for this genus, 
acuminate. Head rather narrow, somewhat coarsely punctate. Thorax rather short, 
punctate like the head, the base feebly sinuate, but the hind angles a good deal pro- 
longed backwards. Elytra somewhat closely punctate and pubescent, the whole of the 
punctures and pubescence subseriately arranged, and without any more distinct series. 
Pygidium very densely, coarsely punctate, rounded at the extremity. Prosternal 
ptocess rather narrow. | 
A single example of this insect was placed amongst the duplicates of C. plena. 
Although superficially similar thereto in size and colour it is very distinct, and cannot 
be confounded with any other of our species. 
