Coleopterological Notices, V. 427 



Sides of the prothorax very evenly rounded ; small species. 



atriventrc 

 Elytra with the outer angle very broadly rounded, the apex conjointly semi- 

 circular in the male or gradually acutely pointed in the female ; prothorax 

 relatively smaller fratermim 



As several species, such as Jimetarium, segmentarium and mar- 

 ginatum are unknown to me, and rugulosum doubtfully determined, 

 I am not able at present to give a complete statement of our species ; 

 sorhi is somewhat doubtful as an American species. 



A. nigerriimini. — Elongate, parallel, polished, the pronotum and 

 abdomen reticulate and alutaceous, the abdomen finely, sparsely pubescent ; 

 legs and antennee pale rufo-testaceous, the latter infumate near the tip. Head 

 transverse, two-thirds as wide as the prothorax, very finely, sparsely punctate, 

 feebly and longitudinally impressed near the sides ; eyes large and prominent ; 

 ocelli small, separated by less than one-third the width ; antennae short, 

 scarcely as long as the head and prothorax, outer joints gradually rather 

 strongly incrassate, sixth longer than wide, seven to ten similar in form and 

 a little wider than long. Prothorax three-fourths wider than long, the sides 

 evenly and continuously arcuate, feebly divergent to beyond the middle, then 

 very broadly rounded and strongly convergent to the apex which is scarcely 

 three-fourths as wide as the base ; disk evenly, transversely convex, very 

 feebly subexplanate at the sides just behind the middle, without trace of 

 median impressed line, the punctures fine but strong and distinct, rather 

 sparse. Elytra a little longer than wide, more than twice as long as the 

 prothorax and scarcely visibly wider, the sides straight and subparallel ; 

 apex broadly feebly and very evenly arcuate ; disk unusually coarsely deeply 

 confusedly and rather closely punctate. Abdomen as wide as the elytra, with 

 four exposed segments. Length 2.2 mm. ; width 0.9 mm. 



Southern California. Mr. H. C. Fall. 



The single male in my cabinet is related to californicum but 

 differs in its intensely black and more coarsely sculptured elytra. 

 The anterior tibise are simple and the median elevated plate of the 

 sixth ventral segment is very large, transverse, twice as wide as 

 long, extending to the apex and with its apex transversely truncate 

 and its sides parallel. 



The nuchal constriction throughout Anthobium is completely 

 obsolete on the dorsal surface, and by this character the species 

 can be distinguished from all the forms of Omalium which I have 

 seen, although the constriction becomes very feeble in several 

 species of the latter genus, such as hamatum and megarthroideSj 

 these also approaching Anthobium in general habitus as well. 



