118 GEO. H. HORN, M. D. 



The above characters which I have drawn entirely from our only 

 representative should be somewhat modified by the omission of the 

 descriptions of the palpi and other parts which may be considered purely 

 generic. The description is rather detailed in order that the omissions 

 in previous descriptions of Promecognathux may be supplied. 



This tribe as typified by our genus has been the subject of some 

 discussion and very diverse opinions have been expressed regarding its 

 systematic position. From my own study I feel convinced that the views 

 expressed by LeConte (Class. Col. N. A. p. 12), are correct. 



As far as known to me two genera only belong to this tribe, as 



follows : 



Last joint of maxillary palpi oblong-oval truncate Proinecogitatlius. 



Last joint of maxillary palpi strongly securiform Axiiiiclium. 



These two genera are placed by Lacordaire (Genera i, p. 247), in a 

 tribe which owes its origin to Chaudoir, (Bull. Mosc. 1846, p. 511), 

 composed as very justly observed by Schaum (Berl. Zeitschr. 1860, 

 p. 178), of very dissimilar material, held together it may be added by 

 a bond of the feeblest nature. The positions of the other genera will 

 be discussed in their proper places and the correctness of Schaum 's 

 views shown except as to Glyptu^^ which has very little to do with the 

 Orthogoniens but far more with the Harpalini. 



As restricted above the tribe falls very naturally between the tribes 

 which precede and the Scaritini. 



Promecognathus occurs in California, Axinidium in western Africa. 



Tribe XIV.— Enceladini 



Antennae moderate in length, straight, arising under a distinct frontal margin ; 

 first four joints glabrous, the first joint stouter suddenly narrowed at base, second 

 equal in length, 3—11 gradually shorter and more slender. Eyes comparatively 

 small, round and distant from the buccal fissure. Head with a single setigerous 

 puncture over each eye. Labrum moderately prominent, arcuate at the sides and 

 feebly emarginate at middle. Mandibles stout, arcuate, a large tooth near the 

 base, outer side deeply grooved and without setigerous puncture. Maxillae with 

 inner lobe strongly hooked at tip and with short spinules on inner edge, outer 

 lobe stout biartieulate, the palpi stout, second joint longer than the others, the 

 terminal broad, oboval. Mentum large without distinct suture at base, broadly 

 arcuate at the sides, deeply emarginate and with a moderate tooth emarginate 

 at tip, epilobes distinct. Ligula prolonged in a broad obtuse point, bisetose, the 

 paraglossaj corneous and closely united it; labial palpi moderate, the terminal 

 joint somewhat triangular and arcuately truncate at tip. Thorax broad, a seta at 

 the side another in front of hind angle. Body pedunculate, scutellum forming 

 the larger space of the peduncle above. Elytra not margined at base, the lateral 

 margin entire and very narrowly inflexed. Presternum obtuse at tip, not pro- 

 longed, the coxal cavities closed behind. Mesosternum broad convex and oblique. 

 Metasternal opimera indistinct, the posterior coxa; distinctly sejtarated l)y a narrow 



