NOTES TOWARDS A LIFE-HISTORY OF POLYOMMATUS D0NZELII. 17 



ing at a point on the posterior portion of the segment. Each of the 

 three angles of the plate is occupied by a black patch of pigment, 

 seemingly at the bottom of a slight depression. The remainder is 

 thickly covered with large seta-bearing tubercles of a dull brown colour, 

 and not of the characteristic white exhibited by the other tubercles. 



General description : A general description of the larva, made when 

 nearly fullgrown, may be appended here, although repeating in some 

 measure what has already been said. Length, 11mm. Colour, pale 

 olive-green, thickly covered with white hairs, giving a silky appearance, 

 and hiding markings. The dorsal stripe is of a deep green and much 

 darker than the three lateral stripes, which, in their turn, are darker 

 than the ground colour. These lateral stripes consist of one immedi- 

 ately below the bosses, the dorsal side of which is parallel to the dorsal 

 stripe, while the ventral side, owing to a broadening out of the posterior 

 margin, slopes slightly downwards from front to rear. Parallel to this 

 lower margin two lateral stripes occur at equal intervals between this 

 and the spiracle, so inclined that the lower stripe appears as the con- 

 tinuation of the upper one of the preceding segment. The spiracular 

 Mange is of a dull purplish-red, with a white band extending 

 along the extreme outer margin. This red colour, in early 

 stages of the instar, extends above the flange proper for a short 

 distance, but, in fullgrown larva?, is confined to the flange itself, the 

 other portions toning down into the olive-green of the lateral stripes. 

 The final segments are slightly suffused with reddish, and not so clear 

 a green as is the case with the anterior segments. The shape of the 

 larva, its broad flat prothorax, its overhanging mesothorax, dorsal 

 bosses, and sloping rear segments, is so typically Lyca3nid that a more 

 detailed description may be omitted here. When fullgrown the larva 

 attaches itself by a thread around the abdomen to the base of a stalk, 

 and changes in about three days to a pupa of the usual Lycamid form, 

 which produces the imago in fifteen days. 



Pupa. — In shape Lycamid, with no trace of anal spike, and with 

 pupal skin attached. Length, 9-5mm. General colour, pale olive, 

 with very transparent wing-cases. The abdominal segments possess a 

 dorsal stripe of a darker green, and, below the spiracles, traces of a 

 reddish stripe, similar in colour to that of the flange in the larva, may 

 be found. Owing to the transparency of the wing-cases this stripe 

 may be traced underneath the same for some distance. The thoracic 

 segments are generally of a rather brighter green colour than the 

 remaining surface. The whole pupa is covered with a fine network of 

 reddish veining, especially clear on the wing-cases, and further, with 

 the exception of the wing-cases, the surface is occupied by numerous 

 small white hairs and lenticles, which latter are more abundant in the 

 spiracular area than elsewhere. The spiracles themselves are white, 

 and situated in slight depressions. Viewed laterally, the pupa appears 

 well rounded at both ends. The mesothorax projects considerably, and 

 between the thoracic and abdominal segments the pupa is contracted 

 to a sort of waist, which is marked on the ventral side by a slight 

 hollow in the otherwise straight line of the wing-cases. Seen ventrally, 

 the pupa presents the appearance of gradually broadening out towards 

 the posterior end. In the thoracic region the width is about 3mm., 

 and from here to the 4th abdominal segment there is a gradual lateral 

 extension, until a breadth of 4mm. is reached. The sides then round 



