32 Rev. F. D. Morice on male terminal segments and 



the aspect in which we view them is even slightly changed. 

 Consequently, to get a real idea of their structure we must 

 look at them all round, and the more we do this the more 

 we find that the characters which strike the eye at once in 

 some particular aspect can no longer be recognized if the 

 point of view be ever so slightly changed. (For this reason, 

 as well as because of its comparatively simple character, I 

 greatly prefer the characters of the seventh segment to those 

 of the armature — they are both more positive, and more 

 recognizable in different positions of the object.) 



However, let us suppose that an armature is lying 

 perfectly flat before us with its dorsum uppermost, and 

 see what characters may be then observed in it. 



First, as to the siijntes. Each of these will generally 

 ap]jear more or less evidently three-jointed. There is a 

 pilose, somewhat palpiform, and often pale apex — a longer 

 and much broader central portion — and (separated from 

 the last by what looks like a transverse suture) a large 

 sub-triangular or sub-reniform hasal lobe — bulging inwards 

 so as to meet the corresponding lobe of the other stipes 

 below the sagittiB. 



This is the commonest type, and when it occurs we can 

 take into account the forms of the three apparent joints 

 which compose the stipes ; the comparative length and 

 breadth of each (individually or as compared with the 

 other two) ; the straightness, convexity, sinuation, etc., of 

 their outlines; the extent, density, and length of the 

 pilosity at the apex, etc. In all these points the stipes of 

 a particular species will present characters which seem to 

 be constant, and will help to distinguish it. 



In other cases, as RadoszkoAvski has pointed out, we can 

 see no suture defining the basal portion of the stipes. In 

 some such armatures the pilose apices are exceedingly long 

 and narrow ; in others much less so. The pilosity in this 

 group is generally very much developed, and differs a good 

 deal in its arrangement in the different species. 



Next as to the sagittcV, we see — or rather seem to see, 

 lor the ai^pearance is very different from the reality — two 

 strips or rods of chitin lying side by side, dilated at the 

 base into lobes which are sometimes sharply angled 

 laterally, while their apices generally look pointed and 

 sometimes divergent. To each of these rods laterally is 

 attached a sort of membranous " wing " or " sail," called by 

 Eadoszkowski the " fourreau," not flat, but bent and folded 



