314 Dr. T. A. Chapman on 



and ncrine are races that arc very closely related. ]\Iy 

 own opinion still is, that they are local forms of one 

 species, but there is no ditHculty in any one believing 

 they are distinct; it is more a question of the definition 

 of "race" and "species" tiiau of the precise amount by 

 which the two forms differ. 



The plates are from enlarged photographs by Mr. A. E. 

 Tonge, and will enable all the points noted to be easily 

 seen, except the colour of the antenna?, which they do not 

 illustrate. 



Lycc'vna jii/renaica is a very interesting species, being 

 very close to L. orhitulus, yet abundantly distinct. It is 

 especially to be observed that it is not the Pyrenavan 

 representative of L. orJntulus, that species occurring in 

 the same region. 



Pijrcnauu seems to be less variable than orhitulus. I 

 found odd specimens at various places near Gavarnie, 

 places a very long way from and very different to that 

 in which I appeared to recognise one of its headquarters. 

 This was on a steep slope at about 5,500 feet, where a 

 limestone of almost chalky whiteness formed the greater 

 part of the surface, sometimes in rocky outcrops, sometimes 

 in partially overgrown screes, not easy to get about on, 

 sometimes quite impassable. 



One recognised that the marked paleness of 2^j/renaica 

 here corresponded with the colour of the rocks, and when 

 the males settled, it was very difficult to see them on the 

 white rubble, unless they had been actuall}* seen to alight. 

 One concluded that this cryptic coloration afforded them 

 valuable protection, and that their rarity elsewhere was 

 probably due to the want of this and not to any 

 absence of food-plant or climatic conditions. I gather 

 that M. Pierrot (Ann. Soc. Ent. France, 1848, p. 899) 

 found the insect at precisely the same place where I 

 took it. 



Any doubt as to jrj/rcnaica being a variety of orbitulus 

 is set at rest by the difference in the ancillary appendages. 

 (PI. XL) The jointed apophyses of the dorsum have rather 

 straighter tips, and the toothed extremities of the clasps, 

 where the differences between different sjiecies of Lyc;vn<i 

 are most easily observable, have 8 or 9 teeth in orbitulus, 

 and IG or 17 much smaller ones in ijyrcnaica. The smooth, 

 chitinous plate which carries them is of about the same 

 size and form in both species. 



