Sept.-Dec, 1921.] NOTM.W : W'estFIELD CoLEOPTERA. 147 



arrangement rather indistinct, interspaces less than the diameters of the punc- 

 tures. Length 1.7 mm., width .7 mm. i specimen. 

 Type 21 May. > 



This species seems very distinct by rca.son of its an.ijulatc tliorax, 

 distinct elytral lunncri and indistinctly serial punctuation of the 

 elytra. H. brcvis described from Guatemala by Sharp seems to have 

 much the same forrri but the thorax is said to be densely rugose and 

 uneven. 



tiriuis Cainosternum new genus. 



Head stronj^ly transverse, short before the eyes, without anlennal 

 s^rooves. clypeus broadly rounded, labrum cmarginate. Eyes convex, 

 rather prominent. .Xntcniue short, eleven jointed, first joint stout, 

 second a little more slender but of equal length, third longer, attenu- 

 ate basally, fourth distinctly elongate, six as long as wide, seven to 

 ten forming an abrupt elongate club, eight smaller than seven or 

 nine. 



Maxillary palpi with the second joint slightly elongate, third joint 

 as long as broad, slightly obconic, terminal joint elongate conic, much 

 longer than the three preceding taken together. 



Labial palpi with the terminal joint suboval. twice as long as 

 wide, as long as the two preceding wliich arc subglobular. 



Prosternum short before the cox:e, finely but strongly carinate 

 medially; coxal cavities closed behind and angulate externally, tro- 

 chantin distinct. Mcsosternum extending to the middle of the in- 

 termediate cox;e which are rather narrowly separated, very strongly 

 carinate. carina interrupted by a rather deep transverse medial groove, 

 the anterior portion of the carina with its ai)ex projecting posteriorly 

 over the groove, not contiguous with the posterior section of the 

 carina which is but slightly produced. Transverse groove limited 

 anteriorly by a fine transverse carina. ]\!elastcrninu of moderate 

 length, posterior coxa; contiguous. 



Legs moderate; femora strongly compressed; tibi;e very slender 

 and cylindrical ; tarsi moderate, joints 5-4-4. 



This genus is related to Anisotoma (Silphida?) but is distinguished 

 by the more elongate and strongly conical terminal point of the 

 maxillary palpi, the carinate prosternum, highly developed meso- 

 sternal carination but especially by the slender, cylin<lrical tibi;e and 



