12 GEO. H. HORN, M. D. 



Female. — Frontal tubercles less prominent. Thorax smaller, less convex, not 

 impressed in front. Spur of anterior tibia slender, less curved, the upper spur of 

 middle tibia at least half the length of the lower. 



Among the specimens collected in our tauna I have observed very 

 little variation, but Harold (Berl. Zeitsch. 1863, 338) notes a form 

 with the thorax entirely black. 



This species has been introduced from Europe, and is quite com- 

 mon in the Atlantic region. It extends from Canada to Texas, and 

 from Maine to Illinois. It will probably invade every portion of 

 our territory. 



A. congregatus Mann. — Oblong, moderately convex, slightly broader be- 

 hind 9 1 piceous, shining, anterior angles of thorax pale, legs rufo-testaceous, 

 elytra variable in color, from i-ufo-testaceous with indistinct cloudings to nearly 

 piceous with the apices only paler. Antennse rufo-testaceous with darker club. 

 Head sparsely punctate, in front slightly rougher, front feebly trituberculate. 

 Clypeus hemihexagonal, apex truncate and feebly emarginate, the angles broadly 

 rounded, sides oblique, gense feebly obtusely prominent. Thorax narrowed in 

 front, sides feebly arcuate, hind angles distinct, but very obtuse, disc rather 

 sparsely punctured with intermixed punctures denser near the sides. Elytra not 

 wider than the thorax, finely striate, striae not closely punctured, intervals very 

 flat with extremely fine punctures. Body beneath sparsely indistinctly punc- 

 tured, the abdomen distinctly alutaceous. Posterior femora with extremely few, 

 very fine punctures, first joint of hind tarsus very little longer than the next 

 two. Length .18-.22 inch; 4.5-5.5 mm. 



The males are usually smaller than the females, the form more 

 parallel, the frontal tubercles very little more prominent, and the 

 spur of the front tibia a little thicker. 



The color of the elytra varies considerably in this species. The 

 ground color is dark rufo-te.staceous, with indistinct cloudings of 

 darker color. The dark spaces are very indistinctly limited, but 

 when studied carefully seem to be of the same type in form and ar- 

 rangement as in inquiaatm. From rufo-testaceous the elyti'a become 

 gradually darker, so that merely the apices are indistinctly paler. 



With this species I have no hesitation in uniting arctieus Harold, 

 as it seems to be merely the darker form described above. 



Occurs from Northern California to Alaska. 



A. aleiitus Esch. — Oblong, moderately elongate, piceous. shining, elytra 

 variable in color from dark red to black, sometimes with traces of a design, legs 

 rufo-piceous. Antennse rufous, club piceous. Head sparsely punctate, in front 

 subrugose; front trituberculate. Clypeus hemihexagonal, anteriorly truncate 

 and emarginate, more deeply in the 9, the angles very distinct, but obtuse; 

 gense moderately prominent, but obtuse. Thorax narrower in front, the sides 

 arcuate, hind angles distinct, obtuse, disc moderately convex, surface punctate 



