CICINDELIM: AND CARABID.E 127 



thoracic impression at each side and the base of the pronotum is 

 invariably margined from side to side; beyond these features 

 there is however considerable diversity in structure, especially 

 of the thoracic angles and sternal process. This group is rather 

 northern in range. The species in my collection may be defined as 

 follows, the typical species of the group apparently not at hand : 



Hind angles of the prothorax distinctly defined and not rounded, though 

 sometimes obtuse 2 



Hind angles broadly rounded 5 



2 Body decidedly ventricose, the prothorax much narrower than the 

 elytra; prosternal process not at all margined 3 



Body more parallel, the elytra not or only slightly wider than the pro- 

 thorax (longicollis section) 4 



3 Form suboval, strongly convex, polished throughout, deep black, 

 the legs rufo-castaneous; head rather small, with deep diverging 

 impressions of moderate length; eyes well developed and rather 

 convex; labrum unusually small, feebly sinuato-truncate, with 

 rounded angles; antennae rather short; prothorax as long as wide 

 ( 9 ) to slightly elongate (cf), the sides well rounded, converging 

 posteriorly, becoming very briefly though distinctly sinuate just 

 before the angles, which are right, very sharp and subprominent; 

 base very faintly sinuate (cT) to rectilinear (9 ), strongly margined, 

 four-fifths the maximum width; apex very feebly sinuate, with the 

 angles nearly right and scarcely at all blunt; surface convex, very 

 finely margined, the stria distinct, attaining base but not apex, 

 the depression nearly linear, impressed, deep, rather sharp at the 

 bottom, a fourth the total length, the surface external thereto 

 convex; elytra short, oval, only two-fifths longer than wide, two- 

 fifths wider than the prothorax, obtusely rounded at apex, the sides 

 arcuate; humeral denticle wholly obsolete; striae fine, well impressed 

 and punctulate (d 71 ), or feeble and impunctate (9), the series of 

 lateral foveae not interrupted but more widely spaced medially; 

 legs moderate; tarsi very slender; hind trochanters of the male obtuse 

 at tip, nearly half as long as the femur. Length (cf 9 ) 7.5-8.2 mm.; 

 width 2.5-2.8 mm. Oregon (Clackamas Co.) pumilis n. sp. 



Form suboval, moderately convex, shining throughout, obscure testa- 

 ceous in color, the legs even slightly paler; head rather small, with 

 strongly diverging, moderate, arcuate and lineiform impressions, 

 the labrum and eyes as in pumilis; antennae moderate; prothorax 

 barely as long as wide to a little shorter, the sides broadly rounded 

 from apex almost to the basal angles, where they become very 

 slightly sinuate, the angles slightly obtuse though sharply defined; 

 basal marginal line fine and deep, the median sinus feeble, the base 

 nearly five-sixths the maximum width and a little wider than the 

 apex, which is very evenly and moderately sinuate, the angles right 

 and slightly blunt, deflexed; surface moderately convex, the im- 

 pression rather short and shallow and not attaining the base, further 



