NORTH AMERICAN COI.EOFTERA. 9 



A. (lenticulatus Ilald.— Oblong, slightly broader posteriorly, piceous, 

 shiniug; suture, e])iiileural margin, under side and legs brownish, the entire 

 margin fimbriate with yellowish hairs. Antcnnse pale ferruginous. Head rather 

 coarsely and moderately densely punctured J or smoother % , frontal suture 

 elevated, but not divided in tubercles, a transverse carina at middle of clypeus. 

 Clypeus broadly triangularly emarginate, on each side acutely toothed and lucre 

 externally a less prominent angulation, sides of clypeus oblique, genjE moder- 

 ately i)rominent but obtuse. Thorax narrower than the elytra, slightly narrowed 

 in front, sides (viewed from above) feebly arcuate, hind angles broadly rounded, 

 surface sparsely punctured, the punctures equally disposed composed of coarse 

 and fine intermixed. Elytra a little wider behind the middle, striate, strife not 

 closely punctured, intervals slightly convex, with very few extremely fine punc- 

 tures. Body beneath piceous, abdomen always paler; metathorax and abdomen 

 sparsely punctate and with few yellowish hairs. Posterior femora smooth, with 

 an irregular row of punctures near the posterior border externally. Length .22- 

 .30 inch ; 5.5-7.5 mm. 



Male.— Head less punctured, elevations more distinct. Anterior tibial spur 

 stouter. Upper spur of middle tibia less than one-third the length of the lower. 



Female.— TLend more closely punctured, elevations feeble. Anterior tibial spur 

 slender. Upper spur of middle tibia half as long as the lower. 



Thif^ specie.s is notable in the form of the clypeus and tlie fimbriate 

 margin. The hind tibiae are conspicuously fimbriate within, the hairs 

 longer and more numerous in the male. 



Occurs in the Rocky Mountain region from Wyoming to New 

 Mexico. 



A. coiii^persus n. sp.— Form oblong, parallel, black, shining, alternate in- 

 tervals of elytra with small round pale spots. Antennse piceous. Head densely, 

 roughly punctured, frontal suture slightly elevated and tuberculate at middle % , 

 or "with obsolete tubercle only J, Clypeus with a short transverse cariiia, the 

 anterior border emarginate at middle and on each side bideutate, teeth acute, the 

 middle ones a little longer, sides of clypeus ai'cuate, gense slightly i)rominent and 

 very obtuse. Thoi-ax as wide as the elytra, slightly narrowed in front, sides 

 feebly arcuate, hind angles distinct but obtuse, disc convex, si)arsely but very 

 regularly punctate at middle, a little denser at the sides, punctures rather fine. 

 Elytra moderately deeply striate, strite closely punctured, intervals slightly con- 

 vex, sparsely punctate. Body beneath black, very sparsely punctate. Hind 

 femora sparsely punctate, without row of punctures. Length .1S-.20 inch ; 4.5- 

 5 mm. 



Male. — Anterior tibial sjmr long, moderately stout, slightly hooked at tip. 

 Upper spur of middle tibise short. 



Female. — Anterior tibial spur slender and acute at tip. Upper spur of middle 

 tibia half as long as the lower. 



In the color of the elytra this species varies in a manner similar 

 to bicolor, the spots being rarely very well marked while it is still 

 rarer to find the elytra entirely black. 



Occurs in California, Mendocino Co. 



TKANS. AMKR. KXT. SOC. (2) .lANT.VKV, 1S87. 



