NORTH AMERICAN COI.EOPTERA. 5 



Thorax convex in front, with at most a slight depression. 



Punctures of thorax ratlier fine, not greatly coarser in front, surface not 



hairy voiijiiiigeiis. 



Punctures of thorax relatively coarse, very conspicuously coarser, denser 



and deeper in front, the surface veith semi-erect hairs liirtioollis. 



Thorax retuse in front, i.e. suddenly declivous in front and broadly impressed 

 behind a transverse elevation, surface rather finely punctured, not liairy. 

 Hind angles of thorax distinct, but obtuse ; fourth joint of antenna; very 

 little prolonged; sutural and geminate strise of elytra deei)ly im- 

 pressed L'lkei. 



Hind angles of thorax broadly rounded ; fouith joint of antennse pro- 

 longed in a process fully half as long as the following joint ; stri<e deeply 



impressed Ktait*. 



From data given priucijjally by Mr. L. E. Rickseckeri, Pleocoma 

 appear-s after tlie fil•^^t .><oaking rain usually in October, sometimes 

 November. The males are in far greater number than the other sex, 

 flying in search of the females, whose habit is to remain concealed in 

 burrows or holes in tlie soil, rarely appearing above ground. 



The four species known to Dr. LeConte have been so well de- 

 scribed that I do not proi)ose to deal with them in any detail, merely 

 giving such characters as may seem to require fuller explanation. 



P. Kieksec'ltori n. sp. — Oval, one-third longer than wide, black, shining, 

 margins fiml)riate and underside clothed with long black hair. Front coarsely 

 and closely punctured, horn of vertex broader and emarginate at apex. Thorax 

 more than twice as wide as long, narrowed in front, widest at base, sides arcuate, 

 the hind angles distinct, but obtuse; disc convex, a slight flattening behind the 

 head, punctures small, not closely placed, sparser near the sides. Elytra a little 

 broader behind the middle, dorsum slightly depres.sed, sutural strise deep, the 

 four pairs of geminate strise on each elytron faintly indicated not punctured, 

 the intervals wrinkled. Body beneath rather densely clothed with long black 

 liair concealing the sculpture. Legs black. Length .80 inch ; 20 mm. 



Male. — Antennne piceous, club pale brown ; first joint elongate 

 conical, second globular, as wide as first; third nar- 

 rower, half as long as the first; fourth and fifth 

 together as long as third ; sixth short, transverse ; 

 seventh shorter and twice as wide as sixth, joints 



eight to eleven forming an elongate club ; ninth joint longest. 

 Fetnale. — Form more robust, ovate, broader behind, more convex, 



brownish, shining, fimbriate and clothed beneath with moderately 

 long reddish-brown hair. Cly])eal horn short, not 

 emarginate, the vertical horn short and broad, emar- 

 ginate at apex. Thorax less transverse than in the 



male, more coarsely and closely punctured. Elytra broadest at apical 



third, the sutural stria moderately deep, the geminate strife feeble. 



