24 MEMOIRS ON THE COLEOPTERA. 



but slightly, the last gradually acutely pointed, a little longer than the 

 two preceding, not evidently constricted medially; prothorax two-fifths 

 wider than long, narrowed but little apically, widest slightly behind the 

 middle, the sides feebly arcuate; base rounded, the angles very obtuse, 

 the surface unimpressed; elytra much shorter than wide, at base equal 

 in width to the prothorax, at apex wider, the sides feebly diverging, 

 straight, the suture equal in length to the pronotum; apical sinuses 

 shallow; abdomen evidently narrower than the elytral apex, parallel, 

 narrowing moderately and arcuately posteriorly from about the middle, 

 the margins rather thin; fifth tergite exactly equal in length to the 

 fourth, the sixth large; basal joint of the hind tarsi equal to the two 

 following combined. Length 1.8 mm.; width 0.42 mm. Colorado 

 (Greeley), Wickham. 



Distinguishable from any of the preceding by the thinner anten- 

 nae, less dense sculpture, shorter basal tarsal joint and fifth tergite 

 as well as many other characters. It is quite possible that this is 

 not an Oxypoda, although it has a good deal the habitus and a 

 rather long basal tarsal joint; I cannot count the joints in the 

 anterior tarsus of the single specimen at hand. 



Oxypoda olescans n. sp. Rather large and moderately stout, fusoid, 

 black, the elytra not evidently paler but with a very fine pale apical 

 margin, the legs pale brown; punctures very fine and close, asperulate 

 on the elytra, dense on the abdomen, strongly alutaceous in lustre; 

 vestiture palish, fine and abundant but very short; head wider than long, 

 three-fifths as wide as the prothorax, the sides parallel, nearly straight, 

 rounding only at base, the eyes at less than their own length from the 

 base, rather large and convex; antennce long, moderately thick and 

 incrassate, blackish, paler basally, the second and third joints much 

 elongated, slightly longer but thinner than the first, the third even some- 

 what longer than the second, fourth evidently longer than wide, tenth 

 slightly transverse, the last longer than the two preceding, much com- 

 pressed, obtuse at apex and feebly irregularly constricted at the middle; 

 prothorax relatively small, fully one-half wider than long, evidently 

 narrower than any part of the elytra, moderately narrowed apically, 

 with evenly and rather strongly arcuate sides, the base rounded, the 

 angles obtuse, the surface feebly impressed medially toward base; elytra 

 large, only slightly shorter than wide, parallel, the suture nearly one-half 

 longer than the prothorax, the apical sinuses rather broad and shallow; 

 abdomen slightly narrower than the elytra, parallel basally, moderately 

 and arcuately narrowing apically, with rather thin inclined margins, the 

 fifth tergite but slightly longer than the fourth; tarsi long, slender, the 

 basal joint of the posterior very long, equaling the next three combined. 

 Length 2.4-3.2 mm.; width 0.65-0.8 mm. California (Humboldt to 

 Sonoma). 



To be known by its relatively somewhat large size, smaller pro- 

 thorax, coloration and antennal structure, the third joint being 

 proportionally very elongate. 



