Coleopterological Notices, VI. 453 



widely separating the coxse 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 clo'sely amalgamated joints, 

 as indicated by the pubescent rings. Elytra seriately punctate, 

 the epipleurse excavated at base. Met-episterna long, narrow, 

 graduall}' wider anteriorly and a little more strongly dilated pos- 

 teriorlj-, 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. discretas^hni 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 the^' may in 

 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 

 short 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 epipleurfie not at all excavated. 



The two genera may be distinguished as follows : — 



Prosternum flat, with two distant and parallel ridges not attaining the aj^ex, 

 the process ^ery short and l>road, abutting on a common le\el with the me- 

 sosternum along a transversely rectilinear line; elytra seriately punctate; 

 body depressed Myclioeerus 



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

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

 extending imder the advanced and rounded Vieaded lol>e of the mesoster- 

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

 gate-oval and convex Boti'odiis 



