( Ixxvi ) 



of rather delicate texture (compared with their allies), but 

 have similar surface sculpturing. On the prothorax of thetis 

 are seen multitudes of lenticles, a good many hairs of several 

 varieties, the ordinary network of raised lines, but in this 

 specimen no 'rosettes.' Near the 6th abdominal spiracle 

 ribbing (or network) largely gives way to lenticles, and short 

 clubbed (and spiculated) hairs are numerous. Near the 7th 

 spiracle there happen in this specimen to be a few longer 

 baton-like hairs, fewer lenticles and a few rosettes, these are 

 the flower-like points that occur at meeting-places of the ribs 

 of network. 



" The cremastral area is quite devoid of hooks, and possesses 

 a few hairs. The cremastral hooks are homologous not with 

 hairs, but with rosettes, and we see in thetis a good many 

 rosettes in this area, a reversion or degeneration. This 

 specimen shows well the finer skin structure, corresponding 

 probably to the skin-points of the larva (seen in slide of 

 Honey-gland). 



" In the Lycaenid pupa, certainly in many other butter- 

 flies and probably in some other pupae, there is a structure 

 on the legs, that I only observed comparatively recently. 

 The appendages (wings, antennae, legs, maxillae, etc.) have 

 only the ribbing of the net ork and are without hairs, 

 rosettes, or lenticles ; but to this rule there is the excep- 

 tion, that lenticles, hairs, etc., are to be found at the 

 tibio-tarsal articulation of the legs, and sometimes on the 

 tarsal joints. They are well seen in Callophrys avis as a little 

 group of lenticles. A portion of the wing of C. avis is shown 

 as a normal example, contrasting in its want of hairs, etc., 

 with the other portions of the pupa of thetis shown. In tlietis 

 the pupa is so delicate that the netting of the wings cannot 

 be photographed so effectively." 



Passing to the structure of the male appendages. Dr. Chap- 

 man continued : — 



" My study of these in the ' Blues ' has led me to recognise 

 certain definite groups, and also that outside these there is a 

 large territory of which I am still too ignorant to recognise 

 very clearly marked groups. 



"The greater number of our British ' Blues' belong to the 



