308 Dr. T. A. Chapman on 



evidence as to structural details, in the eyes of those to 

 whom correctness of noincnclaturo is everything. Not 

 that I am a heretic as to the value of correct nomenclature, 

 and I am certainly strongly opposed to those who err 

 therein wilfully, but I do plead that in studying structure, 

 it is a grievous drawback to have to spend time in nomcn- 

 clatorial research. 



In visiting the Pyrenees last (1007) sunnner, one of my 

 objects was to study on the spot these two species, and 

 with regard to F. Icfchvrci to determine some points, quite 

 apart from the structure of the appendages, that would 

 appeal to the ordinary systematist as proving it to be a 

 species distinct from E. melas. 



I obtained a very fair series of E. /cfcbvrei at Gavarnie, 

 and had the pleasure of exhibiting them to the Society 

 (Feb. 5, 1908). Of U. mdas, I have a fair series from 

 various sources, chiefly from Staudinger and from Mr. 

 A. H. Jones. 



At Gavarnie U. Icfchvrei occurs apparently in all suitable 

 localities. These are always more or less steep stony 

 slopes, so that it is not altogether erroneous to compare its 

 habits in this respect with those of B. ghiciali^. The range 

 of E. glacialis is, however, some 1,000 feet higher than that 

 of E. lefebvrei, and its habitats are even more stony and 

 bare than those of the latter. Both, however, occur 

 amongst rough stones where it is practically impossible 

 to follow them and where it seems a problem where the 

 larva? can find food. Both, if driven otf into grass}^ ground, 

 work back at once to the stony slopes. But both may 

 also be met with on steep slaty screes, on which loco- 

 motion is fairly practicable. The lowest level at which I 

 met with the insect at Gavarnie was on the floor of the 

 Cirque, at about 5,500 feet. I met with it in various other 

 directions, but it was most abundant and most easily 

 captured on the ridge between the two paths to the Port 

 d'Espagne, but more especially on its north slope looking 

 down into the Val de HoUe, at about 7,500 feet. It was 

 also seen freely at the Port d'Espagne itself, rather on the 

 Spanish side, on tolerably level ground (for Icfchvrci). The 

 females are much less numerous than the males, not 

 probably actually, but from the collector's point of view, 

 and like those of f/lacialis, not unfrcquently occur, singly 

 or paired, towards the grassy lower margin of the bare 

 slopes where the males disport themselves. 



