180 THE entomologist's kecord. 



With regard to the male genitalia, Mr. Prout published a note in 

 this paper stating on the authority of Mr. Pierce that in ronr'umata the 

 spines on the tedoeagus are intermediate between those of the allied 

 species and nearer to those of citrata. In spite of this it appears to 

 me that in the general appearance and in individual details alike 

 tnincata and concinnata are extremely close, whilst citrata is somewhat 

 removed from either. 



In the case of the jedcieagus the total width and length is the same in 

 tnincata and cuncinnata ; in citrata it is much longer- and about double 

 the width. The area covered by spines is also the same in length and 

 width in these two species, but much broader and longer in citrata. 

 In fact, so great is this difference that mounted specimens of the 

 genitalia of this species can be recognised readily with the naked eye 

 from those of either of the other two. 



The individual spines vary considerably in length and breadth in 

 all three species, and those of tnincata cannot be distinguished from 

 those of co)tcinnata, but those of citrata are much longer and broader 

 (about two-thirds larger). The total number is about the same in all. 

 The valvHB in all three species differ a little. They are of equal length 

 in trnncaia and concinnata, and obviously shorter in citrata. They 

 widen out more abruptly in concinnata and reach a greater maximum 

 width than in trnncaia. Thus the total area of the valva is greatest in 

 concinnata and least in citrata. The valva of citrata has a straighter 

 inner edge and the smooth area covered by long straight hairs (costa 

 of Pierce) is longer than in the other two. In concinnata the costa is 

 broader than in tnincata, and the hairs on the anellus seem to be a 

 little coarser. 



The total length of the tegumen is equal in tnincata and concinnata, 

 shorter in citrata, it is also narrower throughout in the last-named. 

 The uncus also is shorter and narrower in citrata, and is different in 

 shape. It tapers much less gradually and the extreme tip is shorter 

 and narrower than in either concinnata or tnincata, Avhich in this 

 respect resemble one another closely. 



The females of all three have a rather elaborate genital apparatus, 

 but, as in the case with the male armature, the resemblance is closest 

 between tnincata and concinnata. 



The signum is scobinate in all three species, but in these two 

 species the scobinations become smaller towards the middle, leaving a 

 smooth central area. In citrata Pierce says the whole is scobinate ; 

 there is, however, a very narrow, smooth strip down the centre. 



In all three species there is a thickening of the chitin at the neck 

 of the bursa, and on the inner aspect their spines are placed at regular 

 intervals. In citrata these are few, and they only occupy a part of the 

 ventral side of the neck. At a rough glance the neck appears to be 

 spineless. 



In the other two species they extend almost all the way round, but 

 the band covered with spines in concinnata is nearly double the width 

 of that in tnincata. 



Thus in every point of external appearance and in the details of 

 internal structure concinnata is seen to approach more closely to 

 tnincata than to citrata. 



The geographical distribution of concinnata is a most interesting 

 one. It is quite common in the island of Arran and has been recorded 



