88 MEMOIRS ON THE COLEOPTERA 



eighth much closer to the margin than in the preceding; punctures 

 not very coarse, deep and notably close-set, disappearing only near 

 the ends of the striae, the usual two dorsal fovese small but distinct, 

 before basal and near apical third, on the third interval near the 

 third stria. Length (9 ) 3-7 mm.; width 1.2 mm. Colorado (Colo- 

 rado Springs), Wickham constricticolle Hayw. 



In constricticolle the punctures of the series along the intervals 

 are extremely small, and, unless searched for carefully, would be 

 overlooked ; the setae of these interstrial punctures are very easily 

 shed in both species. 



Group XII variegatum 

 Subgenus Notaphus Steph. 



This group is much the largest in North America, but in the Euro- 

 pean fauna is far smaller than Peryphus. The species are smaller 

 on the whole than in Peryphus and rather less diversified ; some of 

 them are among the more minute of the genus Bembidion and the 

 largest are but little above the average in size and come far from 

 attaining the stature of such as haplogonum and stabile of the Pery- 

 phus group. The mentum is broadly and generally more or less 

 sharply triangular, but becomes obtusely rounded in such forms as 

 cordatum, or margined at apex and very obtuse as in scudderi, or 

 transversely truncate as in obtiisangulum . While most of the forms 

 in Peryphus have the integuments highly polished throughout, there 

 is a large proportion of Notaphus species, where all or a part of the 

 surface is alutaceous, sometimes producing a very dull appearance 

 and, in a great many species, especially of the variegatum type, the 

 surface is but slightly convex and the outline oblong. I have found 

 it convenient to divide the group into nine sections as follows: 



Prothorax as wide at base as at apex 2 



Prothorax narrower at base than at apex, more or less cordiform, except 



in a few species such as lassulum and dentellum 4 



2 Upper surface more or less alutaceous, at least anteriorly, except in 



dorsale, the elytra variegated, except in certain rare cases, the pale 



maculation formed by short lines on the intervals. . .(variegatum) i 



Upper surface polished throughout 3 



3 Sides of the prothorax arcuately oblique behind; body subcylindric 



in form; color uniform black or nearly so (obtusangulum) 42 



Sides of the prothorax sinuously oblique behind; body very much smaller, 



more oblong and less convex, the elytra variegated., .(novellnni) 45 

 4 Elytra with the usual, two dorsal foveae 5 



