June 



Casey : On North American Coleoptera. 161 



Fronotal margins rather broadly concave and reilexed, the edge unevenly undulato- 



-? 

 crenulate -^ 



-^— Basal seo-mcnt of the abdomen as long as the next two combined, the sutures very 



■^ " Abstrulia 



coarse 



Basal segment but little longer than the second, one to five decreasing gradually m 

 length, the sutures rather fine Incolia 



4— Eyes rather well - developed ; pronotum broadly reflexo-explanate at the sides, 

 transversely truncate and scarcely perceptibly bisinuate at base, the fovea; ob- 

 solete ; abdominal segments decreasing uniformly and slowly in length, the first 

 scarcely visibly longer than the second Eupisenus 



Eyes smaller, very short and strongly transverse ; prothorax not at all explanate at the 

 sides, the base broadly, arcuately lobed at the middle, the fovea; distinct though 

 not very well developed ; first abdominal segment as long as the next two com- 

 bined ; body much shorter and more convex Pisenus 



The last two of these genera were mutually confounded by LeConte 

 and Horn, and both considered identical with the European tritomid 

 genus Triphyllus. Pisenus resembles the latter considerably in form, 

 and the noting of the 4-jointed hind tarsi, antennre and pronotal fovea? 

 no doubt led the distinguished authors astray; an inspection of the an- 

 terior and intermediate tarsi, which are 5 -jointed, would have enabled 

 them to avoid the error. 



Tetratoma Fabr. 



This holarctic genus contains several species in the European fauna, 

 and the two following American species seem to be perfectly con- 

 generic, as far as can be judged by the descriptions : — 

 Elongate -oval, strongly convex, rufo-testaceous, the head and antenna; black, the 

 elytra steel-blue ; body above polished, glabrous, except that each puncture en- 

 closes an infinitesimal hair ; antenna; well developed, nearly two-fifths as long as 

 the body, the club as long as the entire preceding portion, the joints quadrate or 

 oblong, the last a little longer and pointed and all pedunculate at base ; prothorax 

 transverse, as wide at base as the base of the elytra, narrowed moderately from 

 base to apex, the latter scarcely at all sinuate, with the angles broadly rounded, 

 the base very broadly and feebly lobed at the middle and finely margined through- 

 out like the sides, the latter broadly and very feebly irregular or subundulate ; 

 basal angles obtuse but not in the least blunt or rounded ; punctures rather coarse 

 and sparse, the basal fovea; distinct, deep and punctiform ; scutellum moderately 

 transverse, cordiform, finely punctured ; elytra three-fifths longer than wide, a 

 little more than three times as long as the prothorax, rather wider behind the 

 middle than at base, thence rapidly, arcuately narrowed to the subogival apex ; 

 humeral callus obtusely prominent ; punctures coarsely impressed and sparse ; 

 under surface more finely but rather sparsely punctate and sensibly pubescent ; 

 basal joint of the hind tarsi about as long as the last. Length 4.7-5.8 mm.; 

 width 2.1-2.65 mm. Northern Atlantic regions truncorum Lee. 



