226 BRITISH BUTTERFLIES. 



is the labrum, the sutures, marking out the rectangular point of which, 

 branch right and left upwards for about OSrnrn. From the end of 

 these lines, the lines of the skin-sculpture radiate on each side ; above 

 these lines the labrum, or what seems continuous with it, narrows into 

 what (in the mounted shell) has all the appearance of a funnel-shaped 

 tube, fading out at about 0*3mm. further ; this is probably the pharynx 

 or beginning of the oesophagus. On either side of this, about (Mmm. 

 apart, are two minute lines with apparently a small drawn-out filament 

 attached underneath. The glazed-eyes (about 0*6mm. across the arc) are 

 pale and dotted with eye-points ; the area within carries one minute 

 hair, and an obsolete hair-base, and is well-sculptured with netted 

 lines. The face between the labrum and antenna 1 carries two or three 

 hairs and as many obsolete bases, somewhat irregularly disposed. 

 There are several lenticles and obsolete hairs at a position that might 

 represent the mandibular articulation. The whole surface has a 

 variously-netted sculpture. The maxilla?, each (Mmm. across at the 

 base, rapidly narrow to 0*2mm., and then, narrowing but slightly, 

 disappear under the antennae at about 8-5mm., their extremities for 

 about 075mm., however, appearing again beyond the ends of the 

 antenna?. And here one notes a very remarkable arrangement, which 

 is quite new 7 to me, though, probably, like other odd structures, once 

 detected, it will be found to be not uncommon, at least in allied 

 species. The extension of the maxillae beyond the antenna? is quite 

 invisible in the living pupa or the empty case, though the mounted 

 specimen leads one to look for a similar arrangement to that seen in 

 the pupa 3 of Calophasias, Plusias, etc. Both the antenna 1 and wings 

 come to the front margin of the 5th abdominal segment, and are there 

 soldered down in the usual way. A little further investigation shows 

 that the maxillary extremities take their further extension inside the 

 pupa-case ; they pass inwards by forming a pocket in the inter- 

 segmental membrane between the 4th and 5th abdominal segments, 

 and lie just within the ventral face of the 5th segment, their 

 extremities reaching to the 6th abdominal. Searching for a similar 

 condition in other species, I find it is much the same in the pupa of 

 Plebeius aryyrognomon, and apparently so in Polyommatus icarus, 

 ( 'yaniris semiaryus (acis), and other Plebeiids. I find no trace of it in the 

 pupae of Ruralids(Theclids), except that, in some Theclids and Lycsenids 

 that do not possess it, there is, at the end of the antenna 1 , a condition 

 a little more than if they merely abutted on the 5th abdominal 

 segment, but rather as if the extremity was a little overlapped. It is 

 apposite to the question of intersegmental membrane, that 1 detect no 

 indication of any incision possessing movement, or of having recently 

 lost it. The first leg is about 2'5mm. long, and 0'iinin. wide at the 

 widest: this wide portion is very short, the upper portion extending 

 to a sharp point between the eye and antennae, and the lower dwindling 

 less rapidly to a point between the second Leg and maxilla at 2*0mm. 

 from the top of maxillae. The second leg is about 0*4 mm. at widest, 

 just over '2mm. long, and ending in a point at each end. between 

 the antenna and the first leg above, between antenna and maxilla below. 

 The first leg possesses three or lour lenticles and an abortive hair at 

 0'8mm. or 09mm. from its lower end. The second leg lias several 

 lenticle< or aborted hairs at 0* 3mm., and again one or two at about 

 0-9mm. from its lower vn^\. These hairs and lenticles vary a little in 



