152 MEMOIRS ON THE COLEOPTERA. 



are slightly separated, the mesosternal process extending to their 

 apical third, the rather bluntly acuminate apex very free and only 

 moderately separated from the short and broadly obtuse metaster- 

 num by a broadly convex and scarcely at all depressed interval. 

 The hind tarsi are slender, with the first joint a little longer than 

 two to four, which are mutually equal. The cephalic carinae are 

 entire. The type is the following, differing from any form of 

 Acrotona known to me, by the pronounced male sexual characters: 



Acrotona (Engamota) absona n. sp. Rather stout, subfusoid and convex, 

 moderately shining, dark piceo-testaceous, the elytra not paler, the head 

 a little darker, the abdomen black and the legs pale brown; punctures fine, 

 asperulate and rather close-set, dense on the elytra, feeble on the more shining 

 abdomen, where the micro-reticulation is rather fine and for the most part 

 transverse in arrangement, transversely radiating from many of the punc- 

 tures, as in other types of this group; head somewhat transverse, convex, 

 the eyes large, rather prominent, the tempora a little shorter, less prominent 

 and arcuately converging basally; antennae moderately long and rather stout, 

 gradually somewhat conspicuously incrassate distally, nearly black, the 

 basal joint testaceous, much longer than the second and stouter, the latter 

 equal in length to the third but less obconic, the outer joints evidently 

 transverse, the last obtusely pointed and rather longer than the two pre- 

 ceding; prothorax moderately transverse, much wider than the head and not 

 quite so wide as the elytral base, subparallel and very moderate!)' arcuate 

 at the sides, more rounding anteriorly, the apex a little narrower than the 

 base, not distinctly impressed ; elytra moderately short and transverse, sub- 

 parallel, the suture a third longer than the prothorax, the apices externally 

 feebly sinuato-truncate; abdomen narrower than the elytra, gradually and 

 moderately tapering throughout, with nearly straight sides, the sixth tergite 

 (c?) with four short stout teeth, the two median dorsally tumid and rather 

 more widely separated than either from the lateral, which are longer and 

 somewhat inclined in plane and hollowed within. Length i.S mm.; width 

 0.45 mm. California (Pomona), Fall. 



This species can be identified from its general resemblance to 

 Acrotona, though having a less developed prothorax, by its incras- 

 sate antennae and distinct male sexual characters. 



Neada n. subgen. 



In this group also, the male sexual characters are distinct but 

 of a wholly different kind from those of the preceding subgenus. 

 The general form of the body suggests Acrotona and the hypomera 

 are strongly inflexed and invisible from the sides. The middle 

 coxae and sterna are very nearly as in Engamota, but the hind tarsi 

 have the first four joints equal as in Acrotona. The cephalic carinae 

 are well developed and entire. The type is as follows: 



