Horn. | 540 [April 19, 
Revision of the Species of the Sub-family BostRicuip& of the United States. 
By GrorGE H. Horn, M.D. 
(Read before the American Philosophical Society, April 19th, 1878.) 
The species here treated of have never been the subject of a special 
paper, most of them having been described in separate memoirs many 
years apart and by the older authors in such a manner as to leave their 
descriptions of no value from the accumulation of new species. 
There is nothing to be added in their generic and tribal arrangement, to 
that already given by Dr, LeConte, in the Classification of the Coleoptera. 
of North America, I merely content myself with copying his tables. 
The three tribes indicated are as follows : 
Thorax with distinct and entire lateral margin...... .....-Endecatomini. 
Thorax without lateral margin. 
Head covered by the prothorax which is asperate in front. ...Bostrichini. 
Head free, thorax not roughened in front.....................-Fsoini. 
Tribe ENDECATOMINIE. 
The head is in great part covered by the prothorax, and is more decidedly 
retracted than the other genera of the sub-family, approaching in this 
respect the Anobiade, with which it also agrees in having the thorax com- 
pletely margined from base to tip. The antennz are eleven jointed, ter- 
minated by a rather loose tri-articulate club, the intermediate joints 3-8 are 
longer than wide and together much longer than the first two joints or the 
club. The anterior cox are contiguous. The tibiz are slender not dentate 
externally and terminated by spurs, those of the anterior tibiz stout and 
rather long. The tarsi are short, the first joint small but distinct in the 
males, connate with the second in the female, so that in the latter sex the 
tarsi are but four-jointed. The last joint of the tarsi is nearly as long as 
the preceding together. 
This tribe forms the connecting link between the Anobiade and Bostri- 
chide, with greater resemblance in its structure to the former than the 
latter, and contains but one genus. 
ENDECATOMUS Mellié. 
Two species occur in our fauna. 
E. reticulatus Herbst (Anobium) Kifer, v, p. 70, which has proba- 
bly been introduced from Europe, and 
E. rugosus Rand. (7riphyllus) Bost. Journ. II, p. 226; dorsalis 
Mellié, Ann. Fr. 1848, p. 218, 
Color dark brown opaque, surface sparsely pubescent. Head finely and 
densely granulate. Thorax densely and more coarsely granulate with pale 
brownish hairs arranged in sinuous lines. Elytra with small granules 
