new Species o/'Histeridre. 175 



recent captures : the two deep marginal striae on the anterior 

 lobe of the prosternum are very peculiar. 



J/ab. Salisbury, Mashonaland, in cow-dung, December 

 1897. 



Hetcerius tristriatus, Horn. 



This species occurs in Colorado at an elevation of 8000 feet ; 

 the ant-host is Formica obscuripes, Forel (Wtckham). 



Hehtrius brunneipennis. Rand. 



This species has been found in Iowa by Mr. H. F. Wick- 

 ham with Formica subsericea, Say, F. exsectoides, Say, and 

 another ant which is probably F. fuscog agates, Forel. 



Termitoxenus strigicollis, sp. n. 



Ovatus, parum convexus, piceus, nitidus, sparse setulosus ; fronte 

 lateribus carinatis ; pronoto longitudinaliter undique strigoso ; 

 elytris in medio profunda foveolatis ; propygidio basi bitubercu- 

 lato et dense ocellato-punctato ; pygidio apice bi-itnpresso, fortiter 

 rugoso. 



L. 3| mill. 



Ovate, rather convex, especially in the dorsal region, 

 piceous, shining, and sparingly setose ; the head, marginal 

 stria cariniform, not meeting anteriorly, nor following the 

 sinuous edge, surface striate, stria3 sometimes reticulate with 

 a puncture in the interspace ; the thorax, hind angles 

 smoothly excavated, anterior angles obliquely truncate, sur- 

 face wholly strigose, striaj long and clear, about 20 in 

 number, and mostly crossing from the anterior edge to the 

 base, a few bifurcate and those in front of the scutellum turn 

 inwards and are partly interrupted or broken, there are a 

 few fine punctures on the interstices, along the basal edge 

 are some ocellate punctures, the marginal stria is carini- 

 form and is double behind the head, with a row of irregular 

 punctures on the interstice ; the elytra, striae, humeral and 

 subhumeral are cariniform and complete and join apically, 

 1-4 are fine, irregular and shortened at both ends, along the 

 outer edge of the first stria? there are detached tine broken 

 lines, but these do not apparently represent a true stria, the 

 fifth is wanting and the sutural is arched at the base turning 

 towards the fourth stria, posteriorly it terminates in the 

 dorsal hollow, in the middle of the dorsum there is a large 

 hollow with nearly circular edges, in the centre of this pit 

 there is a circular smooth puncture with three others behind 

 it, the first two of which are somewhat transverse, the last 



13* 



