386 NITIDULIDA. 
Upper surface without any trace of pubescence. Head moderately coarsely punc- 
tured, bisinuate at the sides. Thorax strongly transverse, the base nearly straight, the 
hind angles much rounded; more finely punctate than the head. Llytra sparingly and 
finely punctate. Under surface with some very fine, extremely short, hairs. In the 
male the mandibles are longer than they are in the female; there is a very short 
transverse supplementary dorsal segment exposed at the apex of the pygidium ; on 
the ventral surface the last ventral plate is sinuate behind, and the supplementary 
segment is seen as a linear curve ; these parts are pubescent. 
Herr Hége procured a good series of this species at Mirador, but from the other 
localities we have received only a small number of examples. Those from Yucatan are 
less shining, darker in colour, more finely punctate, and have the breast blackish ; those 
from Guatemala are also a little different from the Mirador series. But at present they 
had better be treated as all pertaining to one species, the differences being but slight. 
We figure a male from San Isidro. 
PITYOPHAGUS. 
Pityophagus, Shuckard, Elements of Brit. Ent. p. 171 (1839) *; Horn, Trans. Am. Ent. Soe. vii. 
p. 824°. 
Ips (partim), Erichson, in Germar’s Zeitschr. iv. p. 358 °. 
This genus consists of six species—one European, one occurring in Japan, three in 
N. America, and one in Mexico; I now add another from the extreme north of our 
region. All the species of Pityophagus live, I believe, in the bark of Conifere. 
Though at first sight extremely similar to one another they are distinguished by 
important characters: our species, indeed, possesses a most peculiar structure of the 
front of the head. 
Although the genus was not admitted by Erichson 2, it is, as pointed out by Horn}, 
structurally very distinct from ps, and there cannot be any further doubt as to its 
validity. 
1. Pityophagus insignis, sp.n. (Tab. XII. fig. 20.) 
Elongatus, niger, sat nitidus, fortiter punctatus ; antennis piceis. 
Long. 6-8 millim. 
Hab. Mexico (Flohr), Pinos Altos in Chihuahua (Buchan-Hepburn). 
Head very large, closely and coarsely punctured ; eyes small; the vertical depression 
deep though rather ill defined, transverse. Thorax subquadrate, rather coarsely punc- 
tate, the punctures elongate. Elytra more finely punctate than the thorax and not so 
shining; with a distinct sutural stria, evanescent in front. Pygidium large, densely 
punctate; apical margin much elevated. 
Three specimens. 
The species of Pityophagus much resemble one another, but P. insignis is distin- 
