56 Rev. F. D. Morice on male terminal segments and 



The armatures, however, and still more conspicuously the 

 seventh ventral plates, make it impossible, I should say, to 

 unite them. And having separated my specimens by these 

 characters, I can now detect other slight differences in them 

 which I mention in my Tables. 



Personally I have taken nanus only in Egypt, and 

 pumihis only in Algeria. But M. Vachal has sent me a 

 specimen from Tunis, which I can only call nanus; so that 

 probably that species occurs in Algeria also, though I did 

 not meet with it there. 



The almost equilaterally triangular lobes of the seventh 

 segment in ^;?m/ii7?6s are quite unique in the genus, as far 

 as I know it. Yet possibly we may see in them the 

 beginnings of such a modification as has produced the 

 extraordinary " tails " of im'j)uncteitus described below. 



23. Brevicornis, Perez. PI. VII, 23, 28a. PI. IX, 38. 56, 62. 



All my examples of this species are from the Alps. The 

 author records it from Sicily. 



I have mentioned above the likeness of its seventh 

 ventral plate to that of tlaviesanus. The lobes, however, 

 spring from more elongate and altogether larger basal 

 " trunks," which give the segment as a whole a different 

 outline. 



It will be noticed that in my figure the apices of the 

 stipites point outwards. But probably no stress should be 

 laid on this, as these apices have certainly some power of 

 independent motion in the living insect, and though in 

 dried specimens they usually turn inwards, I have found 

 occasional instances to the contrary among examples of 

 other species. 



24. Marginatns, Smith. PI. VIII, 24, 24a. 



As to the determination of this species there can be no 

 doubt. Nothing occurs in this country which could be 

 confused with it, and Smith's types were British insects. 

 It seems to be very generally distributed over Europe, and 

 I have dissected specimens from the most remote localities 

 — one even from the interior of Asia — with precisely 

 similar results. 



The apices of the stipites, in this and several of the 

 species following, look decidedly pale, broad, and rather 

 triangular than palpiform even in the direct dorsal view. 



