22 MEMOIRS ON THE COLEOPTERA. 



These groups are few in number, and, though somewhat indefi- 

 nitely circumscribed and to a great extent morphologically meaning- 

 less perhaps, it will not be difficult to try more than one if in doubt 

 as to the identification of any particular species. 



Group I. 



These species differ among themselves very much in size and 

 facies and in almost everything except the length of the antennae, 

 these being notably elongate when contrasted with the three sub- 

 sequent groups. 



Oxypoda orbicollis n. sp. Large, moderately stout and convex, 

 nearly parallel, rather dull in lustre, pale brown throughout, the head, 

 scutellar region and abdomen but little darker, the punctures and pubes- 

 cence very fine and close-set throughout, the latter unusually short; 

 head as long as wide, one-half as wide as the prothorax, convex, parallel 

 and rounded at the sides, the eyes anterior, moderate and not at all 

 prominent; antenna? long and notably heavy, gradually incrassate, pale, 

 the first three joints equal in length, elongate, the fourth moderately 

 elongate, tenth fully as long as wide, the last ogivally pointed at tip, 

 as long as the two preceding; prothorax large, not quite a third wider 

 than long, widest rather behind the middle, much wider than any part 

 of the elytra, the apex three-fourths as wide as the base, which is broadly, 

 evenly arcuate, the sides subevenly rounded, the basal angles obtuse and 

 blunt; elytra small, parallel, slightly transverse, the suture barely four- 

 fifths as long as the prothorax, the apical sinuses rather broad and feebler 

 than usual; abdomen as wide as the elytra, subparallel, narrowing 

 very little apically, the margins rather thick; fifth tergite much longer 

 than the fourth but similarly densely sculptured and pubescent; tarsi long 

 and very slender, filiform, the basal joint of the posterior fully as 

 long as the next three. Length 3.1 mm.; width 0.8 mm. Wisconsin 

 (Bayfield), Wickham. 



Readily recognizable by the subparallel form, pale color, very 

 minute close sculpture and pubescence, large and feebly transverse, 

 rounded prothorax and by the antennae. 



Oxypoda demissa n. sp. Rather stout and convex, parallel, dull, very 

 finely and densely punctured and pubescent throughout, pale yellow- 

 brown in color, the scutellar region faintly darker, the head and abdomen 

 black or nearly so, except the apex of the latter and the fine apices of the 

 other segments; head three-fifths as wide as the prothorax, much wider 

 than long, the eyes well developed, at rather less than their own length 

 from the base; antennse blackish, the four basal joints paler, long and 

 heavy but with the outer joints only very slightly increasing, third 

 shorter than the second, fourth to tenth similar in form though not in 

 size, slightly transverse, the last not as long as the two preceding, obtusely 



