28 MEMOIRS ON THE COLEOPTERA. 



fourth; basal joint of the hind tarsi much elongated. Length 3.5 miu . 

 width 0.9 mm. Missouri (St. Louis). 



Differs from either convergens or iowensis in the distinctly longer 

 and more incrassate antennae, though they are noticeably short 

 relatively ; it further differs from iowensis in its larger and much more 

 transverse prothorax, and, from convergens, in the more angularly 

 inflated basal parts of the latter. 



Oxypoda manitobae n. sp. Form and coloration nearly as in the 

 preceding, the elytra more obscure and faintly infumate broadly toward 

 base and suture; apices of the tergites faintly palish; minute close punc- 

 tures especially fine and dense on the abdomen, the vestiture fine and close; 

 head three-fifths as wide as the prothorax, wider than long, parallel 

 at the sides, the eyes more convex than in profecta, at their own length 

 from the base and with the fine convex facets equal throughout; antennae 

 short, blackish, paler basally, rather slender and only moderately in- 

 crassate, the second and third joints long, subequal, each slightly longer 

 than the first, the third rather longer than the second, fourth a little 

 longer than wide, the outer joints moderately transverse and obtrape- 

 zoidal, the last as long as the two preceding, rather abruptly narrowed 

 and flattened before the middle; prothorax nearly as in the preceding 

 but more uniformly black and not paler toward the basal angles and less 

 narrowed anteriorly; elytra similar though a little less transverse, the 

 apical sinuses distinct, the suture distinctly longer than the prothorax; 

 abdomen similar though less rapidly tapering, the fifth tergite not so 

 long, three-fourths as wide as the first; posterior tarsi long and slender, 

 the first joint not quite as long as the next three. Length 3.0 mm.; 

 width 0.85 mm. Manitoba (Aweme), Criddle. 



Distinguishable at once from any one of the three species of this 

 group previously mentioned by the less tapering and still more 

 finely and densely punctate abdomen. 



The following group of two species is remarkable and isolated 

 because of the very small head, giving them a habitus immediately 

 recognizable : 



Oxypoda nimbata n. sp. Strongly fusiform, rather convex, somewhat 

 shining, dark piceous throughout, the legs pale; punctures rather strongly 

 asperate and not dense, smaller and closer on the abdomen, the pubes- 

 cence rather stiff and not so abundant as usual; head hardly half as wide 

 as the prothorax, as long as wide, broadly arcuato-truncate at base, with 

 distinct lateral angles, the eyes not prominent, at about their own length 

 from the base; antenna? pale, short, slender basally, rather rapidly and 

 somewhat strongly incrassate distally, the second and third joints long, 

 subequal, each longer than the first, the third but little shorter than the 

 second and as long as the next two combined, they being subequal and 

 about as long as wide, the outer joints becoming rather strongly trans- 



