Coleopterological Notices, VI- 453 



widel}' separating the coxt\? and without elevated lines, the ante- 

 rior lobe short and not concealing the mouth parts. Antennal 

 excavations large and inferior, the antennte ten-jointed, with the 

 two basal joints large, the third elongate, the club large, oval, 

 compressed and composed of three closely amalgamated joints, 

 as indicated by the pubescent rings. Elytra seriately punctate, 

 the epipleura^ excavated at base. Met-episterna long, narrow^ 

 gradually wider anteriorly and a little more strongly dilated pos- 

 teriorl}-, the suture fine, the surface punctate ; met-epimera obso- 

 lete. Mentum elongate, well developed and strongly carinate 

 along the median line. 



Dr. Sharp, in the " Biologia," has regarded some Mexican ex- 

 amples as conspecific with L. discretus, hut considering the habits 

 of this species, and the fact that members of the true Pacific coast 

 fauna seldom extend into Mexico, it is possible that thej' may iu 

 reality represent an allied but distinct species. 



Mychocerini. 



In this tribe the prosternal lobe is short, broadly truncate and 

 does not conceal the trophi in repose, the mentum very minute, 

 the fourth palpal joint slender and as long as the third; antennte 

 with the two basal joints large, the club small, solid, scarcely at 

 all compressed, cylindro-ovoidal, obtuse at apex and apparently 

 composed of two completely amalgamated joints, the second 

 forming the more densely pubescent terminal portion. Antennal 

 cavities small, deep, apical and not visible from above. Labrum 

 shoi't and broadly rounded, the epistoma ver3' large, with the 

 suture fine but distinct. Met-episterna very narrow, the suture 

 fine but more visible than in Murmidius. Legs completely' free, 

 the epipleuroe not at all excaA'ated. 



The two genera ma}- be distinguished as follows: — 



Prosternum flat, with two distant and parallel ridges not attaining the apex, 

 the process very short and Ijroad, abutting on a common level with the nie- 

 sosternum along a transversely rectilinear line; elytra seriately punctate; 

 body depressed ]fly clioc'e I'US 



Prosternum transversely convex, with two very tine, distant, elevated and an- 

 teriorly diverging lines not quite attsiining the apex, the process very short, 

 extending under th,e advanced and rounded beaded lobe of the mesoster- 

 num; elytra without trace of serial punctures, the body much more elon- 

 gate-oval and convex Botrodiis 



