NEMATIDIUM. 479 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
We have received only one specimen of this remarkable insect; although very 
similar to the type-species of the genus it is more elongate, and readily distinguishable 
by the more simple apex of the elytra. It differs also in a still more important 
character, viz. in the abbreviation of the prosternal process, which evidently does not 
reach the hind margin of the prosternum. Hence it might perhaps with propriety 
form a distinct genus. 
I have named this interesting insect in honour of Mr. A. Fry, who has kindly 
entrusted me with his now unique type of NV. mustela, and thus enabled me to distin- 
guish WV. fryanum with certainty. 
2. Nematidium viverra, sp. n. 
Elongatum, cylindricum, ferrugineum, antennis pedibusque testaceis; elytris ad apicem breviter oblique 
retusis, singulo prope suturam longitudinaliter impresso, sutura ipsa ibidem elevata. 
Long. 7 millim. 
Hab. Guatemata, El Tumbador, Cerro Zunil, Mirandilla, Pantaleon ( Champion). 
Similar to V. fryanum in colour and punctuation, but much less elongate, and with 
a little difference in the structure of the terminal parts of the elytra. The oblique 
declivity is somewhat short and abrupt, and the strie entirely cease; but the suture 
is elevated, and there is a well-marked longitudinal depression on each elytron close to 
the sutural elevation. 
Fourteen examples were obtained of this interesting insect; they show no variation, 
except in size. This species is extremely close to NV. mustela, but that insect has the 
prosternal process slightly impressed, so that its tip is a little deflexed, and the middle 
of the mesosternum is densely instead of sparingly punctured. 
3. Nematidium filarium, sp. n. 
Elongatum, cylindricum, nitidum, ferrugineum, antennis pedibusque testaceis ; elytris ad apicem longius oblique 
retusis, sutura haud elevata. 
Long. 6 millim. 
Hab. Guatnma.a, Calderas (Champion); Panama, Volcan de Chiriqui 3000 feet 
(Champion). 
This insect resembles WV. fryanum almost exactly, except that it is much smaller and 
narrower; it differs, however, strongly by the structure of the prosternal process, 
which extends to the hind margin of the prosternum, and in this respect agrees with 
N. viverra. 
We have received only two examples. 
