IO4 MEMOIRS ON THE COLEOPTERA. 



at tip, with four equally spaced short cuspidiform teeth, the lateral but 

 little larger than the median; tarsi long, the basal joint of the posterior a 

 little shorter than the second. Length 3.2 mm.; width 0.73 mm. Cali- 

 fornia (Pomona, Los Angeles Co.), Fall. 



The gradually prolonged, narrow and sharp though scarcely acicu- 

 late apex of the mesosternum, extends fully to apical fourth of the 

 well separated coxae; it is very free and well separated from the 

 short and broadly parabolic metasternum. This species can be 

 easily recognized by the remarkably long third antennal joint, which 

 reverses the usual rule in the genus. 



Dimetrota revoluta n. sp. Small, subparallel, broad and feebly convex, 

 rather shining though closely and subasperately punctate, the abdominal 

 punctures unusually strong, close-set and asperate; color dark piceous, 

 the legs pale; head slightly transverse, impressed on the median line, the 

 eyes moderately large but not very prominent, at a little less than their own 

 length from the base, the tempora rounding to the base; antennae slender and 

 unusually long, only very feebly incrassate, blackish, pale basally, the first 

 joint stouter and a little longer than the second, the latter distinctly shorter 

 than the third but elongate, pedunculate basally, the outer joints fully as 

 long as wide, the last acutely pointed, as long as the two preceding; pro thorax 

 strongly transverse, much wider than the head and as wide as the elytral base, 

 parallel and rounded at the sides, not impressed; elytra subparallel, moder- 

 ately transverse, the suture impressed at base and nearly one-half longer 

 than the prothorax, the apices evidently but not deeply sinuate externally; 

 abdomen small, much narrower than the elytra, perfectly parallel; four basal 

 joints of the hind tarsi equal ; mesosternum extending a little behind the 

 middle of the slightly separated coxae, its finely aciculate apex rather well 

 separated from the small and equilatero-triangular metasternal projection. 

 Length 1.5 mm.; width 0.45 mm. Idaho (Cceur d'Alene). 



This species is also aberrant in its long and slender antennas, 

 short and broad prothorax and apparently less developed cephalic 

 carinae; the type seems to be somewhat immature; the sixth ventral 

 plate is small and narrowly rounded. 



Dimetrota resplendens n. sp. Rather stout, moderately convex, strongly 

 shining, the micro-reticulation everywhere evident but very feeble, the 

 punctures minute, not asperate and rather sparse, well separated on the elytra; 

 color piceous, the elytra slightly paler, the abdomen blackish, the legs pale; 

 head slightly wider than long, the eyes moderate, convex, at fully their own 

 length from the base, the tempora subparallel, less prominent, the carinae 

 fine, not quite entire; antennae long and stout, gradually distinctly incrassate, 

 the second joint slightly longer than the third, both elongate, the fourth 

 longer than wide, the outer joints slightly wider than long, the last pointed, 

 barely as long as the two preceding; prothorax large, rather transverse, 

 much wider than the head and a little narrower than the elytra, parallel, 



