MONOTOMID^E 91 



according to Horn, has the prothorax as wide as long, while in 

 guadraria it is distinctly elongate. 



Monotoma rhodeana n. sp. Somewhat stout and convex, pale ferru- 

 ginous throughout in the single type and rather shining; head much 

 narrower than the prothorax, somewhat wider than long, unimpressed, 

 broadly and feebly convex and very coarsely, polygonally punctate, the 

 eyes more than twice as long as the tempora, very prominent and moder- 

 ately developed; antennae extending to basal third of the pronotum and 

 having an unusually narrow and elongate club; prothorax much wider 

 than long, the apex slightly narrower than the base, the sides straight 

 and strongly serrulate; apical nodes rather large, obliquely truncate, the 

 basal smaller but distinct and more acute; surface very coarsely, poly- 

 gonally punctate throughout, the concave bottoms of the punctures 

 polished; subbasal impressions very feeble and widely separated; scutel- 

 lum small, narrow and truncate; elytra two-thirds longer than wide and 

 a third wider than the prothorax, more ovulate than in any of the pre- 

 ceding species, the sides arcuate and gradually converging behind about 

 the middle, the apex arcuato-truncate; series regular and composed of 

 moderately coarse punctures, the erect setse only moderate in size and 

 not very coarse, not at all conspicuous; pygidium parabolic, rather convex, 

 slightly wider than long, the punctures very close, extremely coarse, 

 shallow and confluent apically, smaller basally; a short hyaline membrane 

 protrudes apically from beneath the rounded tip; metasternum closely 

 and strongly punctate throughout. Length (9) 1.7 mm.; width 0.62 

 mm. Rhode Island (Boston Neck). 



This species is allied only to americana, but differs in its smaller 

 size, less robust outline, narrower antennal club, much shorter 

 prothorax, with larger and more prominent, obliquely truncate 

 apical nodules, and in the less coarse and more sharply denned ely tral 

 punctures. The pale ferruginous color of the type is quite probably 

 a feature of immaturity, as I have a specimen of the normally black 

 americana from Louisiana, which is also pale testaceo-ferruginous 

 and likewise two very pale examples of the deep black producta. 



The antennae in this genus, as elsewhere in the family, are really 

 n-jointed, the eleventh joint being in great part inclosed within 

 the tip of the tenth, as in Rhizophagus . 



Hesperobaenus Lee. 



In some respects this genus is intermediate between Monotoma 

 and Europs, as in the form of the last funicular joint of the antennae, 

 which is obconical, a little wider and less oblong than in the former, 

 but not so wide as in the latter, where it becomes about equal in 

 width to the club. In most respects, however, it does not even 



