80 ENTOMOLOGICAL SOCIETY 
Dendroctdnus mexicanus n. sp. Female type, length 4 mm. ; elongate, 
cylindrical, dark brown. Head broad, with two frontal elevations sepa- 
rated by a shallow median groove; anterior and posterior halves punctured ; 
middle rugose from eyes to frontal elevation; antennal club broad, com- 
pressed towards tip, and with two broadly curved sutures. Prothorax 
nearly a." long as broad, slightly narrowed from base to anterior margin, 
which is sinuate, the base declivous and bisinuate; punctures moderately 
coarse, becoming finer towards sides; anterior third with distinct trans- 
verse ridge extending across proepisternum. Elytra twice as long as 
prothorax; sides parallel; base obliquely serrate; interspaces rough- 
ened with asperities, which are coarser towards base and vertex; the 
first interspace with a row of coarser asperities from near base to vertex ; 
declivity subconvex, sparsely clothed with long erect hairs which also 
extend to near the middle of the elytra; the striae narrow, punctures 
obscure; interspaces flattened and roughened with irregular granules. 
Male type, length 4 mm. ; differs from female in the more prominent 
tuberculate frontal elevations separated by a deeper groove. Prothorax 
with transverse ridge across the anterior third less distinct than in the 
female and not extending across the proepisternum. Elytra with deeper 
striae and more convex interspaces. 
$ and cf Types. No. 7518 U. S. Nat. Mus., Sacramento, 
Amecameca, Mexico, in pine, A. L- Herrera collector. 
Twenty-five females and eleven males received at different 
times from A. L Herrera and Dr. S. J. Bonansea, from Ameca- 
meca, Michoacan and Tacubaya, Mexico, vary in length from 
3 mm. to 4 mm. average about 3.8 mm. 
The characters described in the types are fairly constant in all 
the specimens, but the submarginal ridge is more distinct in 
some females than in others, and, while present in some males, 
it is obscure or absent in others. 
This species belongs to the division of the genus characterized 
by more prominent frontal tubercles in the male and a trans- 
verse ridge near the anterior margin of the prothorax of the 
female. It finds its nearest ally in D. parallelocollis Chap, of 
Mexico, and D. frontalis Zimm. of the Eastern and Southern 
States. It is, however, easily separated from parallelocollis by 
the uniform smaller size and more brownish color, and is 
distinct from D. frontalis, with which the smaller examples 
agree in color and size, by the much longer and coarser hairs 
of the elytral declivity, the rugosities coarser towards the 
base and declivity, and a row of coarse granules on the first 
elytral interspace. This is evidently the species most to blame 
for the destruction of the pine forests in Mexico, and evidently 
has habits very similar to that of D. frontalis, which devastated 
the pine and spruce forests of the Virginias in 1891 and 1892, 
