new Species of Histeridae. 47 



much more finely punctured ; the pygidia are densely punc- 

 tate ; the pro3ternal keel is parallel laterally, with a marginal 

 stria which indistinctly joins anteriorly but does not continue 

 along the base; the mesosternum is anteriorly obtuse, with a 

 shallow lateral sulcus, the sulci are shortened anteriorly and 

 bend towards each other ; the metasternum has a longitu- 

 dinal sulcus in the anterior part ; the anterior tibiae are 

 5-dentate. 



The female : the rostrum is simply obtuse in front and 

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

 thorax is simply convex behind the neck. 



Ilab. Argentina (C. Bruch). One male and one female. 



Teretriosoma intrusum, Mar?., 1870. 



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

 with Calopertha truncatula, 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. The 

 Histeridae, however, do not always confine themselves to one 

 species, as I found Trypeticus veda, Lew., in Ceylon feeding 

 on Miuthea canaliculata, F., and on Platypus furcutas, Bland., 

 both species being similar to the Histerids in circumference. 

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

 feeding on Minthea canaliculata and brunnea, Steph. Mr. 

 Waterhouse has, as already noticed in this 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 which the imago feeds and that the larvae 

 are insectivorous. In Japan 1 found Trypeticus fayi, Lew., 

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

 under other conditions I think that they would have sought 

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

 being parasitical or commensal; they aie predaceous and 

 insectivorous. 



Teretriosoma biguttatum, sp. n. 



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

 pedibus obscure rufo-brunneis ; pronoto ad angulos minute flavo ; 

 metasterno postice transversim tenuissime striato ; tibiis anticis 

 G-dentatis. 



L. 24-2! mill. 



Subcylindrical, short and robust, black above, beneath 

 somewhat brownish ; the antennae flavous, legs uniformly 



