962 THE ENTOMOLOGIST S RECORD. 
very dense organs, and in order to preserve their natural appearance 
Mr. Rayward has found it necessary to mount them in deep cells, to 
avoid flattening and consequent distortion. This method has the dis- 
advantage that in photographing them the whole of the organs are not 
in focus in the same photograph. Consequently it has been necessary 
to photograph separately portions of the claspers of the majority of the 
species, aS in these the chief differences of specific value exist. The 
whole of the preparations are mounted to show from the same view- 
point, z.e., underneath. 
The most remarkable feature in the organs of the group is that 
whereas two of the species, M. athalia and MM. parthenie, have as an 
uncus a pair of pronounced spines, the others are without anything in 
the nature of a dorsal armature that would assist them in clasping the 
female. M. parthenie and M. varia, which until recently were con- 
sidered to be forms of one species, are shown by the genitalia to be 
abundantly distinct, and M. berisalensis has important divergences from 
its parent species, M. deione, which seem to point to its distinctness as 
a species. 
The aedoeagus, which is usually of much value in giving specific 
distinctions, is in this group somewhat uniform, and as the claspers 
alone are abundantly sufficient to determine the species, I have not 
dealt with any differences I have perceived in this organ. The saccus 
varies a good deal in shape in the different species, but so far as I have 
gone, it varies almost as much in individuals of the same species, and 
therefore it would be necessary before relying upon the variations of 
this organ to examine a great many more examples than IJ have done. 
Only the most salient points of difference are called attention to in 
the following descriptions; for the lesser points study of the figures is 
necessary. 
MM. athalia.—The uncus consists of a pair of prominent spines which, 
in Pl. 1ii., fig. 1, can be seen behind the aedoeagus. The lower claw of 
clasper has a very distinct armature of serrations on the inner surface, 
which are shown in PI. iii., figs. 1 and 2; the outer surface is smooth. 
M. athalia var. dictynnotdes.—This form, which was originally 
described in Jris, vol. xi., p. 2, by Hormuzaki, from specimens taken 
near Czernowitz, in the Bukovina, was considered by him to be a form 
of M. aurelia. Reference to Pl. iil., figs. 8 and 4, which are made from 
a specimen kindly handed to me by the Rev. G. Wheeler, who obtained 
it from Hormuzaki, and which was captured on Monte Cecina, near 
Czernowitz, shows that it is not that species, but a form of MV. athaiia. 
In this sub-species the claw is somewhat more slender, and the 
serrations more pronounced than is the case in typical M. athalia. 
Unfortunately the preparation does not show this latter point to 
advantage. 
M. parthenie.—In this species the uneus consists of a pair of spines 
similar to those obtaining in M. athalia ; the claspers, however, are 
quite different in form from those of that species; in the upper claw 
the outer surface is smooth and the inner surface is serrated, whereas 
in the lower claw the inner surface is smooth and the outer surface has 
several not very pronounced serrations. See Pl. ii., figs. 5 and 6. 
M. varia.—The striking difference between this and the last species 
includes the absence of the bifid prolongation of the uncus. The upper 
