34 MEMOIRS ON THE COLEOPTERA 



the punctures gradually obsolescent apically, the scutellar stria completely 

 wanting, the fovea distinct; intervals moderately convex, the third with a 

 substrial puncture just behind basal third; lateral line of foveae not 

 interrupted; hind tarsi slender, filiform, the basal joint about as long as 

 the next two and a little longer than the fifth; anterior tarsi (d") moder- 

 ately dilated, biseriately and closely squamulose beneath, the middle 

 tarsi very slender and unmodified. Length (cf) 6.0 mm.; width 2.15 

 mm. Isthmus of Panama (Colon), Beaumont. 



To be readily known from olivaceus Bates, from Guatemala, 

 by its smaller size and, though nearly similar in outline to that 

 species as figured, it seems to differ so radically in its obsolete 

 anterior thoracic impression, feebler foveae, very much finer basal 

 punctures and not at all explanate basal angles, that a different 

 though closely related genus may be indicated. The sides of the 

 prothorax have a seta behind apical third and another smaller 

 at the hind angles. 



Subfamily 



Chlaenius Bon. 



The following forms, some specific and some which may be 

 regarded at present as of subordinate value, may be conveniently 

 defined at the present opportunity: 



Chlaenius regularis ssp. apacheanus nov. Form and facies somewhat 

 as in regularis Lee., feebly shining, the elytra opaculate; upper surface 

 deep indigo-blue throughout, the under surface black, the legs rufous; 

 head as in regularis, the antennae similar but rather shorter; prothorax 

 shorter, transverse, fully two-fifths wider than long, otherwise as in 

 regularis throughout; elytra in form, sculpture and relationship with the 

 prothorax nearly similar but more abbreviated; under surface nearly 

 similarly but rather less densely punctured and pubescent; male with the 

 anterior tarsi distinctly shorter, the punctures on the upper surface of 

 the three dilated joints coarser, the second joint distinctly wider than 

 long, the third but very little longer than wide. Length (cf 9 ) 13.0- 

 13.5 mm.; width 5.5-6.0 mm. Arizona (southwestern) and the adjacent 

 parts of California. Five examples. 



Closely allied to regularis Lee., which is not a variety of sericeus, 

 but differing in its smaller size, shorter prothorax and shorter and 

 more punctate anterior male tarsi; in regularis, the dilated joints 

 of the anterior male tarsi are feebly punctate on their upper surface, 

 the second is quadrate and the third much longer than wide. 

 It differs from viridifrons in its stouter form and entirely violet- 

 blue upper surface. 



