36 MEMOIRS ON THE COLEOPTERA. 



Distinguishable from any other form in its vicinity by the more 

 developed and less abbreviated antennae, very large, strongly 

 anteriorly narrowed prothorax, narrow elytra and other characters. 



Oxypoda croceola n. sp. Ochreo-testaceous, the elytra darker, the 

 head piceous, the abdomen indefinitely clouded except basally and near 

 the apex, the legs pale; sculpture and vestiture nearly as in the preceding; 

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

 inflated basally, the eyes not prominent, coarsely faceted and at less 

 than their own length from the base; antennae dusky, paler basally, 

 short, moderately and gradually incrassate, of the same general structure 

 as in other species of this group, the first and third joints equal in length 

 and evidently shorter than the second, the fourth as long as wide, tenth 

 two-fifths wider than long, the last very obtuse at tip; prothorax rather 

 large, moderately transverse, convex, the sides converging and moderately 

 arcuate from the obtuse basal angles to the apex, the base evenly rounded; 

 elytra well developed, rather transverse, as wide as the prothorax, the 

 suture about as long as the latter, the apical sinuses deep ; abdomen slender, 

 much narrower than the elytra, parallel, narrowing slightly near the 

 apex, the margins not thick, the fifth tergite long. Length 2.0-2.1 mm.; 

 width 0.43-0.46 mm. Missouri (St. Louis) and Texas (Houston). 



Stouter, with more anteriorly narrowed prothorax and wider 

 elytra than the neighboring species and with the abdominal as- 

 perities unusually small and dense; the sixth ventral plate in the 

 type is transversely truncate at tip, with rounded angles. 



Oxypoda mollicula n. sp. Moderately slender, colored and sculptured 

 as in the preceding, except that the abdominal asperities are larger and 

 not so dense, the body narrower and more parallel; head similar though 

 relatively larger, two-thirds as wide as the prothorax; antennae short, 

 pale, gradually distinctly incrassate, otherwise as in croceola, except that 

 the fourth joint is not quite so long as wide, the outer joints shorter 

 and more transverse and the last more pointed; prothorax moderate, 

 shorter and more parallelogramic, fully one-half wider than long, the 

 sides subparallel, evenly and distinctly arcuate, the base rounded; 

 elytra moderate, rather short, parallel, only very slightly narrower than 

 the prothorax, the suture four-fifths as long as the latter, the apical 

 sinuses deep; abdomen slender, slightly narrower than the elytra, parallel, 

 just visibly narrowing near the apex, the margins moderate, the fifth 

 tergite long. Length 1.8-2.0 mm.; width 0.4-0.45 mm. North Carolina 

 (Asheville). 



The form of the rather short and parallel prothorax would seem 

 to place this species in arbitrary group II, denned above, but the 

 elytra are much more feebly developed than in that group and all 

 its affinities are with simulans, nigriceps and others of this group, 

 from which, however, the characters above noted distinguish it 

 rather obviously. 



