500 Coleopterological Noticed, V. 



A. 3 — Maxillary palpi very small, of two or three joints. 



Chennium, Atinus ami Biotus 

 A. 2 — Maxillary palpi moderate, elongate, cylindrical, of three joints. 



Anitra 

 A. 1 — Maxillary palpi well developed, of four joints Ctenistes, etc. 



Although not at all resembling Chennium, it is probably more 

 closely allied to that genus than to any other thus far described. 



Mr. Raffray states on page 32 of the " Etude," that the Ctenis- 

 tini and Tyrini are distinguished by having the first ventral very 

 small and visible only between the coxte ; this is certainly not the 

 case in Desimia, Ctenisis and Sognorus, typical ctenistide genera, 

 in which I distinctly trace the first segment from side to side be- 

 hind the coxai. There also seems to be some uncertainty in the 

 assii»:nment of genera to the Ctenistini and Tyrini, Tmesiphorus, 

 for example, apparently being much more closely allied to D<^imia 

 and Ctenistes than to Tyrus, not only in general structure but in 

 the form of the palpi and in the latero-inferior excavations of the head 

 near the base, with the resultant spiniform prominences near the eye. 



A. glabenila n. sp. — Rather stout, polished and pale yellowish-brown 

 throughout ; integuments subglahrous, tlie anterior parts with excessively 

 minute and remote suberect setae, long coarse and denser behind the eyes, 

 long sparse and bristling on the ocular canthus and on the large surface of the 

 clypeus below the antennae, longer and porrect at the apex of the elytra, on 

 the abdomen closer even coarse and recumbent as in Ctenistes ; the tubercle 

 at the base of the pronotum is also densely clothed with long coarse decum- 

 bent setae. Head as wide as long, the tubercle very narrow, scarcely more 

 than one-fourth as wide as the width across the eyes ; antennae foui'-llfths as 

 long as the body, the third joint feebly obconical, twice as long as wide, three 

 to eight equal in width, the latter quadrate, ninth a little thicker, oval, 

 tenth similar, though a little larger, oval, longer than wide, eleventh thicker, 

 cylindrical, obtusely, obliquely pointed at tip, as long as the three preceding. 

 Prolhorax scarcely as wide as the head, widest at basal third where the sides 

 are rounded, thence feebly convergent to the apex which is broad and sub- 

 equal to the base ; disk convex, strongly declivous laterally, one-third wider 

 than long. Jilytra not as long as wide, tiiree-fourths longer than tlie protho- 

 rax and twice as wide; humeri elevated, rounded and obtuse, the humeral 

 width four-fifths of the subapical. Abdomen as wide as the elytra and slightly 

 shorter, convex, strongly declivous behind, the surface even throughout. 

 Length 1.25 mm. ; width 0.6 mm. 



Arizona. 



The single specimen is a male but with very feeble sexual char- 

 acters as far as can be observed. This species is probably myrme- 

 cophilous. 



