408 MEMOIRS ON THE COLEOPTERA 



Marginalis Makl., is altogether different from capucinus and entirely 

 valid as a species; the outer antennal joints are much shorter and 

 more transverse in some males than in others, but I have not been 

 able to differentiate any distinct subspecies. Pedicukis Nord., is 

 unknown to me. It is highly probable that melanocephalus Mann., 

 was founded upon an immature specimen of marginalis, the frontal 

 punctures having been overlooked. 



Microsaurus Steph. 



This group is a rather natural continuation of the preceding, 

 but the head is more oblong or subquadrate, or more abruptly 

 narrowed at base to the nuchal constriction, and frontal punctures 

 on the disk, of the kind distinguishing Distichalius, are unknown. 

 The genus or subgenus is divisible into two rather distinct groups, 

 based upon the sculpture of the scutellum as follows: 



Scutellum perfectly smooth and punctureless as in Distichalius 2 



Scutellum punctured 10 



2 Head elongate, the eyes not prominent and at much more than their 

 own length from the nuchal constriction. Body moderately stout, 

 subfusiform, shining, black, the prothorax rufous, sometimes black- 

 ish, the abdomen blackish-piceous, with the segmental apices paler; 

 sometimes the entire body is testaceous, with the bead blackish; 

 head parallel and feebly arcuate at the sides, the posterior lateral 

 puncture at a great distance from the eye; antennae moderately long 

 and incrassate, infuscate, paler basally; prothorax nearly as long as 

 wide, rounded at the sides and base, the former gradually converging 

 and less arcuate apically, much wider and a little longer than the 

 head, the tripunctate series distinct; elytra slightly shorter than 

 wide, fully as wide as the prothorax, somewhat narrower basally; 

 punctures moderate, distinct, not very close-set, asperulate; abdomen 

 subparallel, slightly narrowing arcuately toward tip, finely, rather 

 sparsely punctate, the punctures separated as widely as those of the 

 elytra; sixth ventral (of) with a small and not very deep sinus, the 

 adjacent surface briefly and very slightly impressed; tarsi rather 

 slender. Length (cf 9 ) 7.5-10.0 mm.; width 1.35-1.8 mm. Rhode 

 Island and District of Columbia to Lake Superior. Abundant. 

 [Queduis peregrinus Grav. and silvicola Csy.] Terminatus Mels., 

 not known to the writer, is probably subspecifically different. 



peregrinus Grav. 



Head never elongate, subquadrate to broadly oval 3 



3 Eyes separated from the nuchal constriction by at least about half 



their own length 4 



Eyes large, separated by distinctly less than half their length from the 

 constriction '. 9 



