( Ixxv ) 



ably well ; also many slides illustrating the differences in the 

 genital armature of the two species under review, and their 

 allies. 



Proceeding, Dr. Chapman said — 



" Not only in the Plebeiids but in all the Blues, the hair 

 bases in the larvae are stellate. Those of Lampides hoeticus 

 show them well. In contrast with these the hair bases in 

 Hairstreak larvae are petaloid, shown in a slide of hairs of 

 Laeosopis rohoris. In the ' Coppers ' the hair bases are simple, 

 but have a very deep socket for the hairs. In the Chryso- 

 phanids it is the hairs themselves that become complicated, 

 varying both on larvae and pupae into remarkable forms of 

 fungi-form and umbrella hairs. 



"There is a curious hair on the prothorax of the larvae of 

 Blues, and present also in other sections of Lycaenids ; in the 

 last stage of A. thetis {bellargus) it forms a very beautiful 

 object with the curious modification of the surroundings, it is 

 not quite so special in coridon. Unfortunately time did not 

 allow of slides of these being made, but I show you the similar 

 hairs in L. telicamis and Cupido minimus ; in these it is a very 

 long slender hair, like nothing else on the larva, and has a 

 very special base. In the larva of thetis and some others there 

 is a dark spot marking this region. 



"The honey-gland on the 7th abdominal segment is present 

 in most Blues, and also in Thestorids : it is well marked in the 

 majority of Plebeiids : it is not present in the first instar. The 

 narrow slit has usually a large number of lenticles along each 

 margin, with clubbed and curved hairs in many species. In 

 prepared skins there are usually four faint circles seen appar- 

 ently in the gland. These are no doubt glandular structures, 

 and are probably modified hairs, possibly hairs of tubercles 

 I and II which disappear when the honey-gland developes. 

 These circles are seen most plainly in the slide of C, rtibi, of 

 those shown. 



" The pupae of coridon and thetis are typical ' Blues,' 

 short, thick, and with the ends tucked under so that what 

 are in most butterfly pupae the extremities are here quite 

 ventral. They are not quite so short and dumpy as some other 

 Blues, and decidedly less so than many Theclids. They are 



