GONICGLUS. | 607 
tubercle on the head of the male being divided behind and the division continued 
backward as an obscure channel in which a very minute angular projection from the 
middle of the front margin of the thorax plays. The female may be identified by the 
interruption in the middle of the marginal impressed line of the thorax: in this 
character it agrees, I believe, with the female of G. tricornis. Five specimens. 
6. Gonicelus brevicollis, sp. n. 
Oblongo-ovalis, parum conyexus, niger, nitidus, fortiter punctatus; elytris fortiter seriatim punctatis, pube 
erecta minus dense vestitis. 
Long. 53 millim. 
Hab. Mexico, Jalapa (Hége), Tuxtla (Sallé). 
Differs from G. mexicanus in the much coarser punctuation, narrower form, more 
scanty pubescence, and rather shorter antenne. It is still closer to G. germanus, but 
has a shorter and more coarsely punctate thorax, the anterior-marginal line of which is 
straight in the middle, and the hind angles not acute. The three species are similar 
in the male characters. In the male of G. brevicollis the projection from the thoracic 
marginal line is extremely minute, and the discoidal tubercle of the head is well 
marked. It is not improbable that this is a small form of G. yermanus, notwithstanding 
the shorter thorax. The two specimens are in a bad state of preservation. 
7. Gonicelus mexicanus, sp. n. 
Latior, ovalis, subdepressus, nigricans, sat nitidus ; antennis piceis, pedibus piceo-rufis; prothorace disco crebrius 
subtiliter punctato, punctis lateralibus parum numerosis ; elytris dense vestitis, seriebus punctorum quatuor 
prope suturam persubtilibus. 
Long. 53 millim. 
Hab. Mexico, Jalapa (Hége). 
Rather larger than G. wnicornis, and readily distinguished by the different sculpture 
of the thorax and the very fine series of punctures on the middle of the elytra. The 
antenne are unusually long, the club very abrupt and the sete on it unusually long. 
Thorax very broad in proportion to the length, much narrowed in front, hind angles 
acute; it is rather closely and finely punctured on the middle from front to base, and 
the larger lateral punctures are less numerous and distinct than usual; the crenation 
of the lateral margin is very fine. ‘The outer series of punctures on the elytra are rather 
coarse, but the internal ones become progressively finer, so that the one near the 
suture is almost obliterated. The under surface is formed and sculptured almost as in 
G. unicornis. _ 
We have received only one specimen of this fine species; it is doubtless a male. 
The head is broad and short, the eyes large; on the middle there is a tubercle, from 
which a channel proceeds backward; on the thorax there is a small angular projection 
of the middle in front, received into a depression on the head as in G. germanus. This 
