140 MEMOIRS ON THE COLEOPTERA 



dark brown, the second joint as long as the first and about as long as 

 the next two, the third slightly elongate, obconic, fourth transverse, the 

 tenth barely as long as wide, the last obtuse at tip, as long as the two 

 preceding; prothorax short, nearly two-fifths wider than long, widest 

 near the apex, the sides thence distinctly converging and scarcely at all 

 arcuate to the obtuse and rather blunt basal angles, the median line 

 feebly impressed, gradually rather more widely and evidently basally; 

 elytra longer than wide, parallel, with straight sides, very slightly wider 

 and three-fifths longer than the prothorax; abdomen parallel, with 

 straight sides, barely visibly narrower than the elytra, the fifth tergite 

 one-half longer than the fourth. Length 1.4 mm.; width 0.24 mm. 

 California (Paraiso Springs, Valley of the Salinas River, Monterey Co.). 



Not closely allied to any other species and recognizable at once 

 by the very small size, slender parallel form, unusually short pro- 

 thorax, long elytra and other features as stated. 



The following species is Mexican and is so aberrant that it will 

 in all probability be separated at least subgenerically at some future 

 day: 



Hydrosmecta depresseola n. sp. Parallel, distinctly depressed, dull 

 in lustre, finely, rather closely punctate, the abdomen less closely, more 

 shining and with the minute sculpture feeble, not dense and subtrans- 

 verse; color black throughout, the legs blackish, paler distally ; pubescence 

 notably long, abundant, plumbeous but distinct; head slightly wider 

 than long, four-fifths as wide as the prothorax, unimpressed, the eyes 

 prominent, at a little less than their own length from the base, the tempora 

 slightly more prominent and still more strongly rounded, the carinae 

 fine, not quite entire; antennae piceous, paler basally, slender, rather long, 

 only feebly incrassulate distally, the third joint a little shorter than the 

 second, both very slender, fourth much elongated, fifth to seventh dis- 

 tinctly, the eighth to tenth slightly, longer than wide, the last slender, 

 barely as long as the two preceding; prothorax fully a third wider than 

 long, widest before the middle, where the sides are broadly rounded, 

 thence sensibly converging and straight to the base, the median line not 

 finely, very feebly and equally impressed throughout; elytra feebly 

 transverse, at base a fifth or sixth wider, the suture two-fifths longer, 

 than the prothorax, the humeri distinctly exposed at base; abdomen long, 

 much narrower than the elytra, parallel, with the sides straight, the fifth 

 tergite distinctly longer than the fourth; middle coxae contiguous, the 

 metasternum behind them transverse; two basal joints of the hind 

 tarsi equal, each longer than three or four. Length 2.6 mm.; width 0.47 

 mm. Mexico (Guadalupe, Federal District), Wickham. 



Recognizable by the form of the head, antennae and prothorax 

 and also by the rather conspicuous pubescence. 



