﻿LEPIDOPTEROLOGIE COMPAREE 45 



var. Armoricanus, and var. Alpina, Pyrénées), to 0.66 (in spéci- 

 mens from Allos and Switzerland). Slight différences appa- 

 rently exist in the side processes of the dorsal armature, thèse 

 are so soft as to vary under différent aspects and pressures so 

 that any measurements are unreliable, and the différences are 

 therefore doubtful. 



Tt may be noted that the darkness of the Figs. lo, il and 12 

 is photographie, the préparations are of similar pale chitinous 

 colour as the others. 



The number of teeth varies very much, or perhaps rather the 

 teeth that are vvell developed may be the whole set, or may be 

 perhaps two-thirds of them, the remainder being small or even 

 too small to be counted. I cannot correlate thèse variations with 

 any race or variety — e. g. Armoricanus may hâve 10 to 13 teeth; 

 Alpina (Digne) 10 to 14; Alpina (Pyrénées) 7 to 12. A spécimen 

 from Saas-Fee has 10 without evanescent ones. Var. Nivea 

 (Pfynwald, etc.) has ii, 12 or 13, sometimes with and sometimes 

 without an evanescent tail. 



In the Aegus section, we may take the falces as fairly de&ning 

 the species. The simplest measurement seems to be the length 

 of the straight portion from the lowest point of the curve or 

 bend. As compared with Argîis with a length of 0.4 mm., we 

 find Micrargus (Amoor, Japan) with a length of 0.53, M élis sa 

 (America [and Sarepta]), 0.56 and Aegus (Geneva) of 0.63 mm. 



In Micrargus, the straight pièce is not quite so straight as in 

 the others, and, as in Aegus, it is fairly robust, in Melissa and 

 in Sareptensis it is much more slender and very straight, so that 

 it looks very long though not really as long as in Aegus. In 

 Melissa the soft processes are more slender than in Aegus and 

 Micrargus, and still more so in Sareptensis. 



In Aegus and Micrargus, the angle below the end of the clasp 

 so pronounced in Argus just exists, and the teeth are small and 

 numerous, 16 to 20; in Melissa and Sareptensis the teeth are 

 still smaller. 



In Micrargus the toothed extremity is not only without appre- 



