XORTII AMERICAN COLEOPTEKA. 19 



cnate, hind angles distinct, but very obtuse; basal niarginal line entirely want- 

 ing, disc sparsely punctate with intermixed punctures. Scutellum of usual tri- 

 angular form. Elytra i)arallel, rather deeply striate, striiE indistinctly jjunctured, 

 hut more closely toward the base, intervals convex, with extremely few minute 

 punctures. Body beneath sparsely punctate. Mesosternum in front alutaceous, 

 ojjaque, between the coxse subcarinate. Legs brownish testaceous, the posterior 

 femora very sparsely finely punctate. Length .16 inch ; 4 mm. 



Sexual characters. — These seem to be similar to those above described for lividus. 



A small inconspicuous si)ecies, notable as being one of two in the 

 present series of the genus in the absence of basal marginal line of 

 the thorax, while the other characters are quite different from lividus, 

 with which it has been found advisable to associate it. 



Occurs in Florida. Four sjjecimens. 



Group E. 



Scutellum small. Anterior tibite tridentate, obsoletely or not 

 crenulate above the teeth, first joint of the tarsus as long as the 

 second. Posterior tibite fimbriate at apex with equal spinules, the 

 first tarsal joint not as long as the next three. Head not tubercu- 

 late, but roughly punctured. Mesosternum not carinate. 



The only species known to me which can enter this group is A. 

 rugifrom, notable by its small size and a form of clypeus resembling 

 denticidatiis. 



A. riigifrous Horn. — Oblong, slightly broader posteriorly, piceous shining, 

 elytra variable, often yellow, ornate with black as in inqiiinatus, rarely almost 

 entirely piceous. Legs ferruginous. Antennte ferruginous, club piceous. Head 

 coarsely, densely and roughly punctured. Clypeus broadly, feebly emarginate 

 on each side a tooth, external to which is an angulation, sides of clypeus oblique, 

 the gente scarcely prominent and very obtuse. Thorax convex, piceou.s, the front 

 angles usually paler, slightly M'ider at base than apex, sides feebly arcuate, hind 

 iingles distinct, but very obtuse; base broadly arcuate, basal marginal line fine 

 and indistinct, surface with moderate punctures rather closely placed at the sides, 

 more distant at middle. Elytra as wide as the thorax, a little broader behind 

 the middle, striate, striae closely punctured, intervals slightly convex, with few 

 .scattered punctures. Body beneath sparsely obsoletely punctate. Hind femora 

 sparsely punctate. Length .10-. 14 iuch ; 2.5-3.5 mm. 



Sexual characters.— The anterior tibial spur of male is shorter and stouter than 

 in the female ; the upper middle tibial spur is also shorter. 



The elytra vary nuich in color. Three specimens have the elytra 

 in great part yellowish with elongate black markings resembling in- 

 quinatns. The typical specimen is almost entirely piceous with a few 

 indistinct yelloAvish markings. In the latter individual the thorax 

 is entirely piceous. 



Occurs at San Diego, California. 



