NORTH AJIERICAN COI.EOPTERA. 81 



tibise strongly tridentutc externally, crenate above. Posterior femora sparsely 

 inmctate, the marginal line extending from the knee to middle, tibia with dis- 

 tinct accessory s]>iuiile, the first tarsal joint elongate, bnt not longer than the 

 long spur. Length .IS inch ; 4.5 mm. 



Next to socialis this species is one of the most reniarkablo in our 

 fauna, without, however, possessing any very striking structural 

 characteristics. In facies it resembles Notihins gugatci, a Tenebri- 

 onide. Its form is shorter and broader than any Atienius in our 

 launa, and the dense and very equal punctuation of the entire ujjper 

 surface is a peculiarity by means of which it may be at once known. 



Its distribution is peculiar and restricted, and it seems rare. Speci- 

 mens are known from Wisconsin, jNIissouri and Kansas. 



A. oblongus Horn. — Oblong, nearly parallel, black, feebly shining. Head 

 convex, densely punctate, the punctures coarser on the occiput and gradually 

 finer in front, clyiieus at middle much smoother. Clypeus broadly, but feebly 

 emarginate, on each side rounded, the sides arcuate, genre feebly prominent, ob- 

 tuse. Thorax nearly twice as wide as long, sides nearly parallel, feebly arcuate, 

 hind angles distinct, but obtuse; base arcuate, the marginal line distinct and 

 deep, disc moderately convex, the punctures rather closely placed, a little finer 

 to the front and much denser at the sides. Elytra as wide at base as the thorax, 

 the humeri sharply dentiform, disc deeply striate, strife catenulate, intervals 

 convex, the inner intervals with a series of closely placed punctures each side of 

 the summit of the carina, the outer intervals more densely punctulate at their 

 sides from apex to bottom. Mesosternum carinate between the coxte, anteriorly 

 densely punctulate and opaque. Metasternum coarsely punctured at middle, 

 scabrous and opaque at the sides. Abdomen very coarsely and closely punctate 

 from side to side, the segments 2-5 crenate in front. Anterior tibise tridentate 

 externally, crenate above. Posterior femora coarsely, but not closely punctate, 

 the posterior marginal line deep and entire, the posterior tibia with di.stinct ac- 

 cessory spinule, the first tarsal joint longer than the long spur. Length .•J4 inch ; 

 6 mm. 



This species, in an arrangement according to facies, shoidd be 

 placed after alter miim and hnbricatus, as it more nearly resembles 

 these in form than the more shining species which follow. It is an 

 easily known species, being the only one with simple clypeus with 

 an acces.sory tibial spinule and entire marginal line to the posterior 

 femora. 



One s])ecimen, California. 



A. iiiqiiisilus n. sp.— Obhmg oval, slightly broader behind, moderately 

 convex, piceous or castaneous, shining, legs pale reddish brown. Antenna- pale 

 rufotestaceous. Head moderately convex, spar.sely punctate, sides of clyjieus 

 transversely wrinkled. Clypeus broadly, lint feebly emarginate and imi)re.s.sed 

 at middle, on each side broadly rounded, the sides oblique, feebly arcuate, genie 

 obtusely rounded. Thorax one and a half times as wide as long, not narrower 

 behind, sides feebly arcuate, n«arly straight, hind angles very obtuse, base ar- 

 cuate, marginal line distinct, disc convex, with coarse punctures moderately 



TKANS. AMER. ENT. SOC. XIV. (11) -M'KIL, 18t<T. 



