﻿46 LÉPIDOPTÉROLOGIE COMPARÉE 



ciable angle, but is very short and very broad, at least as broad 

 as in Argus, whilst in M élis sa it is narrow and even narrower in 

 A cgiis. 



The width across the base of the teeth is in Argus, 0.19 mm.; 

 Micrargus, 0.2; Melissa, 0.16; Aegus and Sareptensïs, 0.13. 



The spécimens are mounted as nearly as may be in the same 

 manner, with spécial référence to giving a dorsal view of the 

 dorsal armature and displaying the dentate end of the clasp, 

 they are ail pressed flat so as to be easily photographed, the 

 photographs are by Mr. F. N. Clarke. 



The évidence of the androconia is strongly in favour of 

 Flebeius Aegus being one species and ail the other European 

 forms of Argus being another. It is periiaps not quite décisive 

 for this reason that in both Aegus and Argus there is consi- 

 dérable variation. 



The typical form in Aegus is a circular outline with a long 

 shaft. In Argus the outline is rather quadrilatéral with two more 

 or less straight sides, narrowing basally and more or less rounded 

 ends and a shaft rather shorter than in Aegus. Aegus varies a 

 little in the Argus direction but really very little, but Argîis 

 varies very much so that some spécimens are, judging by andro- 

 conia only, doubtful. Thèse variations in Argus do not afford 

 any material for further dividing it into races or species, since, 

 for example, a number of spécimens from one locality. Val Veni 

 (Courmayeur) afforded as great a range of forms, as occurs 

 throughout the species. See Figs. 57 and 56, Androconia of 

 Aegus and of Argus, var. Arnioricanus. 



The androconia of the American and Asiatic species agrée 

 very closely with those of Aegus. 



I hâve not been able to detect any différences in the female 

 appendages, to which I can attach spécifie value. In neither 

 form {^Argus and Aegus') is there any definite terminal plate to 

 the rein (heina), in both there is a slight irregular longitudinal 

 line of chitin along the ductus, opposite about the middle of 

 the rein, the amount of this varies a little in individuals. In 



