182 [January. 



and tho olytra more strongly striated, with smoother iutei'stices. The male is 

 always the narrowest, and has tho apical segment of the abdomen beneath longi- 

 tudinally striated, strongly, and somewhat unevenly ; the middle striaa being not so 

 closely packed as those on the sides. 



O. fuscipes appears to be rather the larger of the two. Typically, it is elongate, 

 almost glabrous, with the thorax closely and delicately granulated, and not longer 

 than broad ; and the elytra oblong, crenate-striate, with the interstices obsoletely 

 rugose. The chief varieties have the elytra either more deeply striated, with the 

 interstices more strongly rugulose, or (fagi) closely rugulose-tuberculate, with 

 scarcely any stria, or the disc of the thorax closely punctulated. Tho legs are often 

 bright red ; but this is also the case in some examples of tenebricosus. 



In the male (which is still narrower than the female), the last segment of the 

 abdomen is delicately, closely, and evenly longitudinally striated beneath. 



Apart from the sexual character, it wiU thus be seen that O. fuscipes is a nar- 

 rower, more elongate insect than tenebricosus; with no scanty patches of pubescence, 

 a shorter and broader thorax, and the elytra either more deeply striated or with 

 more rugose interstices. 



I shall be glad if the present reference to the subject causes an examination 

 of specimens from different localities ; as there is no reason why we should not 

 have fuscipes as well as tenebricosus. 



With regard to O. ambiguus, recorded as British by De Marseul (Cat Col. 

 d'Eur., 1863), and by Stierlin (loc. cit., 281), I may remark that I have taken 

 specimens, answering very well to its description, at Rannoch, under the same 

 stone as 0. rugifrons, to which it is assuredly very closely allied, — if distinct, which 

 I doubt. 



It should be somewhat naa-rower than O. rugifrons, and clothed more thickly 

 with hairs ; the thorax is somewhat more finely granulated, and the elytra are more 

 finely punctate-striate, with the granulations of the interstices not arranged in such 

 distinct rows. The rostrum and vertex are more rugose-punctate, the punctures 

 (though scarcely more distinct than in rugifrons) running into longitudinal rugnlse ; 

 the rostrum, moreover, is distinctly keeled in the middle, with an obsolete longi- 

 tudinal fun-ow on each side. The second joint of the funiculus should be almost 

 shorter than the first, instead of somewhat longer, as in 0. rugifrons. 



O. impoticus, found in France, appears to be very closely allied to rugifrons ; 

 but having the rostrum slightly keeled, the thoracic granulations larger, more 

 obtuse, and setiferous, and the elytra more deeply striated, with level and dehcately 

 granulated interstices. 



O. Ghestleri, found in Switzerland, is also nearly allied to rugifrons and 

 impoticus ; differing from those species in being smaller and narrower, and having 

 much less incrassate antennae, of which the second joint of the funiculus is almost 

 half as long again as the first. — E. C. Ryk, 284, King's Eoad, Chelsea. 



Further notes on Oligoneuria Rhenana. — In my notes on OUgoneu/ria rltenana, 

 Imhoff. (Vol. I., p. 262), I stated that these cphemoridous insects appear at Basle 

 in tho first days of September, as for many years back this had proved to be the 

 rule. But I have since been informed, by one of my correspondents, that tliis 



