new Si)eci'es 0/ [[IstcrxdiK. 4 7 



much more finely |)uiictureil ; the |)v;,ndia are densely punc- 

 tate ; the prosternal keel is parallel laterally, with a marginal 

 stria which indistinctly joins anteriorly but does not continuo 

 ah^ii^ tho base; the mesosternuni is anteriorly obtuse, with a 

 shallow lateral sulcus, the sulci are shortened anteriorly and 

 bend towards each other ; tho meta.sfernutn has a longitu- 

 dinal sulcus in the anterior part ; the anterior tibiai are 

 5-dentate. 



The t'eniale : the rostrum is sim))ly obtuse in front and 

 there is a wide circular impression between the eyes, and tho 

 thorax is simply convex behind the neck, 



IJab. Argentina {C. Bruch). One male and one female, 



Teretn'osovia intrusum, ]\Iar?., 1870. 



Mr. E. P. Stebbing has found this Intlian species associated 

 with Calopertha (runcafida, Ancey, an insect of a rather wide 

 distribution in the Asian area, and one very nearly of the 

 same girth and on which I do not doubt it fed. Tlie 

 Histeridse, however, do not always confine themselves to one 

 species, as 1 found Tri/peticus veda, Lew., in Ceylon feeding 

 on Mint/tea ciuaiiculata, F., and on Piati//>us furcatus, Bland., 

 both species being similar to the Ilisterids in circuint'erence. 

 In July 1878 1, with others, found Teretrius picipes, F., 

 feeding on Minthea canaJiculata and hrunnea, Steph. ^Ir, 

 Wateriiouse has, as already noticed in tliis Magazine, bred an 

 African Teretrius in the British Museum from acacia-bark 

 infested with Xylopertha and Sinoxylon, so that it seems clear 

 that the larval and pupal stages are passed in the perforations 

 of the species on wliich the imago feeds and that the larvae 

 are insectivorous. In Japan 1 found Trypeticus fagi^ Lew., 

 on several occasions feeding on Platypus severini, Bland., but 

 under other conditions I think that they would h:\ve sought 

 other species. It is incorrect to speak of the Histeridse as 

 being parasitical or commensal; they are predaceous and 

 insectivorous. 



Teretriosoma biyuttatum, sp. n. 



Subcylindricum, breve, supra nigrum, nitidura ; antennis flavis, 

 pcdibus obscure rufo-brunneis ; prouoto ad angulos minute flavo ; 

 metasterno postice transversim tenuissime striate ; tibiis anticia 

 6-dentatis. 



L. 24-2] mill. 



Subcylindrical, short and robust, black above, beneath 

 somewhat brownish ; the antennse flavous, legs unitormly 



