PTEROSTICHIISLE 363 



Monoferonia n. gen. 



The male of Evarthrus mancus Lee., from Habersham Co., Geor- 

 gia, has, according to the original description, a small transverse 

 tubercle near the apex of the last ventral segment. In describing 

 Evarthrus diligendus, Chaudoir states that the last ventral of the 

 male has a transverse ovulate excavation near the posterior mar- 

 gin, nothing being said of any tubercle or ridge. In Pterostichiis 

 osculant Csy., the last ventral of the male has a large deep trans- 

 verse excavation at tip, occupying nearly half the entire length and 

 bounded anteriorly by an even transverse ridge, more than half as 

 long as the entire width of the segment in line with it. We have, 

 therefore, three obviously different characterizations for the male 

 abdominal modification in this genus. Unless Chaudoir over- 

 looked the transverse ridge or tubercle, he was therefore probably 

 mistaken in considering his diligendus the same as mancus. Le- 

 Conte's description makes no mention of any excavation, the an- 

 teriorly bounding transverse ridge of which in oscnlans could not 

 be called a tubercle in any sense. It now seems to me, in view of 

 these facts, that it would probably be well to maintain all three of 

 these species as distinct until actual comparisons can be made, the 

 appalachius of Horn being, in any event, a synonym of osculans 

 (Mem. Col., IV, 1913, p. 132). In mancus LeConte states that, 

 besides the longitudinal fovea, the pronotum has at the posterior 

 angles an oblong puncture. In osculans there is, besides the elon- 

 gate and wholly discal impressed fovea, a small arcuate impressed 

 line, inwardly flexed basally, and a third as far from the sides as 

 from the fovea, not closely approaching the angle and not resem- 

 bling in any way an oblong puncture. The arcuate line of oscu- 

 lans, just mentioned, is widely and wholly detached from the elon- 

 gate fovea, so that the following language used by Chaudoir, in 

 regard to diligendus, could not apply: "de chaque cote de la base 

 un sillon profond, qui s'arrete au tiers de la longueur et qui remonte 

 en crochet le long de la base et du bord lateral, ou il est oblitere." 

 It can be seen from this, however, that osculans is probably more 

 closely allied to diligendus than to mancus; it is probably from 

 somewhere in the Altantic regions of the continent and not more 

 western, as originally surmised by the writer. 



