12 LONGICORNIA. 
Hab. Costa Rica, Volcan de Irazu, 6000-7000 feet (Rogers). 
Differs from its congeners somewhat in facies, the difference being due chiefly to the 
form of its thorax, the lateral spine of which is exactly median, very long and sharp and 
nearly straight. With this is combined the relatively small size of the thorax, not only 
as to its length, but also its breadth, the width (exclusive of the spines) being only half 
that of the elytra. The antenne are very long, about a fourth longer than the body ; and 
none of the joints make any approach to the oval form so frequent in the genus. The 
opaque joints are very minutely striated. 
PYRODES. 
Pyrodes, Serv. Ann. Soc. Ent. Fr. 1832, p. 186. 
Ten or twelve species of this genus are known, all inhabiting Tropical America. 
1. Pyrodes tenuicornis. 
Pyrodes tenuicornis, White, Proc. Zool. Soc. 1850, p. 11, t. 18. f. 5. 
Hab. Muxico, Oaxaca (Fenochio). 
2. Pyrodes marginatus. 
Pyrodes marginatus, White, Cat. Long. Col. B. M.1. p. 49. 
Hab. GUATEMALA. 
In the Munich Catalogue P. tenuicornis and P. marginatus are entered as the sexes 
of one species. I am inclined to doubt the correctness of this view, as the examples of 
the two forms (one of each) which I have been able to examine appear to be both males. 
OTHEOSTETHUS. 
Otheostethus, Bates, Trans. Ent. Soc. 1872, p. 169. 
The only species known is the following :— 
1. Otheostethus melanurus. (Tab. II. fig. 12.) 
Otheostethus melanurus, Bates, Trans. Ent. Soc. 1872, p. 170. 
Hab. Nicaracva, Chontales (Beit). 
HOLONOTUS. 
Holonotus, Thoms. Class. Long. p. 804. 
A genus peculiar, as far as at present known, to Central America and Mexico. It is 
doubtful, however, if its separation can be maintained from the North-American Spheno- 
stethus (occurring in the middle Atlantic States), in which case its distribution would 
be extended into north temperate latitudes. Itis nearly allied to Solenoptera and allied 
