AMERICAN COMPONENTS OF THE TENTYRIIN^E 313 



to support the statement of Horn. The species in my cabinet 

 may be briefly outlined as follows : — 



Larger species, not materially under 6.5 mm. in length, the meta- 

 sternum always very much longer than the first ventral segment.. 2 



Small species, always under 6.0 mm. in length, the metaste^num 

 shorter, though at least slightly longer than the first ventral 9 



2 — Metasternum nearly twice as long as the first ventral; elytra very 



long, generally between four and five times as long as the pro- 

 thorax, with broadly and feebly impressed longitudinal lines 



almost throughout the width 3 



Metasternum much less than twice as long as the first ventral, the 

 elytra never more than four times as long as the prothorax and 

 usually much less, and without such broadly impressed longi- 

 tudinal lines 4 



3 — Form oblong-elongate, parallel, rather shining, piceous-black, the 



head, pro- and mesosterna and legs piceo-rufous, broadly and 

 moderately convex; head very short and broad, densely, moder- 

 ately coarsely and shallowly muricato-punctate, the sides before the 

 eyes feebly converging and very strongly arcuate, becoming par- 

 allel at the eyes ; prothorax small, rather more than twice as wide 

 as long, the sides narrowly but strongly reflexed, evenly and 

 strongly arcuate, the apex deeply sinuate but only slightly nar- 

 rowed, the punctures moderate, shallow, muricate and close-set, 

 becoming densely crowded but only slightly larger toward the 

 sides; elytra three-fourths longer than wide, almost five times as 

 long as the prothorax and nearly a third wider, parallel, obtusely 

 parabolic at tip, the humeri broadly exposed at base, the punc- 

 tures moderate, shallow and irregularly seriate laterally, minute 

 and confused broadly toward the suture, the intervals laterally 

 generally with minute confused punctures ; abdomen minutely 

 but rather closely punctate. Length 9,2 mm.; width 3. 78 mm. 

 New Mexico (Albuquerque) longipennis Csy. 



Form similar, the size smaller, rather shining, pale rufo-castaneous, 

 the legs brighter rufous; head nearly as in longipennis^ the eyes 

 similarly large and rather prominent; prothorax less transverse, 

 much more narrowed toward the deeply sinuate apex and with 

 the sides evenly and still more strongly arcuate, fully twice as 

 wide as long, the punctures more minute and rather sparser 

 toward the middle, coarser and close but not so crowded toward 

 the sides ; elytra three-fourths longer than wide, more than four 

 times as long as the prothorax but only a fifth or sixth wider, 

 parallel, obtusely subogival at apex, the humeri well exposed in 

 the reentrant angle, finely, not densely, irregularly punctate 

 throughout, the summits of the feeble ridges between the im- 

 pressed lines subimpunctate, the punctured series more or less 

 irregular even laterally, sometimes almost indistinguishable ; abdo- 

 men minutely, sparsely punctulate. Length 6.5-7.7 ''''"''^- ' width 

 2.65-3.15 mm. Texas (near El Paso) discors Csy. 



Proc. Wash. Acad. Sci., August, 1907. 



