236 



[August, 



of the struts (s) of the median 

 lobe is very constant, and they 

 start from what I call the barrel 

 (ml) of the lobe by a shoulder. 

 It is about the point of diver- 

 gence of struts, barrel, and la- 

 teral lobes that the greatest 

 complexity of structure exists ; 

 but the details of this are only 

 visible in a successful mount in 

 Canada balsam ; as this cannot 

 easily be attained, this point is 

 not suitable for practical de- 

 termination of tlie species. A 

 strong chitinisation, extending 

 along the middle of the median 

 lobe, projects forwards between 

 the struts, and may be called 

 the rod (r). There is a dorsal 

 rod and a ventral rod. 



Hdophorus affiiiis : dorsal aspect of aedeagus : 

 bp, basal piece ; 11, lateral lobe ; ml, median 

 lobe ; r, rod ; s, strut of median lobe. 



I have also made a study of the female genitalia; the parts are 

 complex but very small, and though they exhibit some distinctions are 

 not available for systematic work. 



a. Cliannel of head narrow, not wider in front. 



a'. Flanks of elytra visible beneath. 



1. — Helophoms diaminoni sp. n. 



Latus, rohustus, capite thoraceque nigro-suhmetallicis, elytris ferrugineis vage 

 nigromaculatis, antennis, palpis pedibusque rufescentibus ; thorace fortiter sculp- 

 turato ; elytris sat profunde et fortiter crenato-striatis, interstitiis latis, margine 

 laterali conspicuiter elevato. Long. 4^, lat. 2 mm. 



? H. strigifrons Biackb., Ent. Mo. Mag., xiii, p. 40. 



The broad form, robvist bviild, and the fact that the flanks of the elytra are 

 more broadly visible on the under-surface than in any of the allies, distinguish 

 this remarkable species. 



The palpi ai'e rather short and stout, the terminal joint twice as long as the 

 penultimate, slightly infuscate at the tip. Head coarsely granulate, but the 

 granviles on the clypeus much effaced, very dark in colour, channel of vertex 

 narrow, not broader in front. Thorax very broad, strongly convex from front 

 angle to front angle, the surface coarsely granulate but the granules more or less 

 effaced on the convexity of the disc, the coloi;r very dark, the surface made 

 uneven by convexity of the middles of the median and sub-median intervals; 



