74 
THE SCOLYTID BEETLES. 
Xo. 6. THE SMALLER MEXICAN PIXE BEETLE. 
(Dendroctonus mexicanus Hopk. Figs. 35, 36. ) 
The smaller Mexican pine beetle (fig. 35) is a dark brown, elongate, 
cylindrical barkbeetle, ranging in length from 3 to 4 mm., with head 
broad and grooved, prothorax 
but slightly narrowed toward 
the head, and punctured, and 
elytra with coarse rugosities 
toward the base and declivity. 
the latter with long hairs. It 
attacks pine trees in Mexico, 
where a large amount of timber 
has died in certain localities, evi- 
dently owing to the work of this 
and the larger Mexican pine bee- 
tle. It excavates winding egg 
galleries (fig. 35) through the in- 
ner bark, the larval mines being 
concealed, like those of the west- 
ern and southwestern pine bee- 
tles, beneath the inner surface 
of the bark. Very little appears 
to be known of the seasonal his- 
tory and habits of this species, 
Fig. 35.— The smaller Mexican pine beetle (Den- 
droctonus mexicanus): Adult, greatly enlarged, 
and section of egg gallery, slightly enlarged. 
(Author's illustrations.) 
Fig. 36.— The smaller Mexican pine beetle: Distribution map. (Author's illustration.) 
but evidently they will be quite similar to those of the southwestern, 
southern, and Arizona pine beetles. It will therefore be subject to 
the same general treatment for its control, namely, the removal and 
