504 BRITISH LEPtDOPTERA. 



abdominal segments dorsally, also the wings, maxillae, legs and 

 antennae, shiny black ; the remaining abdominal segments duller 

 blackish, but with shiny rings on the posterior portions of the seg- 

 ments, and a shiny cremaster. Ventral view : The mouth is ventral, 

 surmounted by a prominent headpiece ; the glazed eye forms a distinct 

 lunule, running from the base of the antenna to the base of the first 

 pair of legs ; the maxillae forming two slender ridges, extending to the 

 6th abdominal segment, passing for some distance beneath the first 

 pair of legs and antennae, but reappearing again at the 5th abdominal 

 segment. The third pair of legs terminates on either side of the tip of 

 the tongue. The antennae terminate above the incision, between the 

 4th and 5th abdominal segments. The first pair of legs conspicuous, 

 but the second pair almost entirely hidden ; the terminal portions of 

 the maxillae and third pair of legs free from the abdominal segments ; 

 the ventral portions of the 6th, 7th and 8th abdominal segments ex- 

 hibit transverse scars in the position of the larval prolegs. The genital 

 organs, on the 9th abdominal segment, are not at all conspicuous ; 

 there are distinct divisions ventrally between abdominal segment 8, 

 abdominal segment 9, and the cremaster, in the $ pupa, whilst in the 

 5 pupa, the genital organs on abdominal segment 8 cause the partial 

 obliteration of the division between 8 and 9. Lateral view : The antenna 

 comes from the front of the head along the costa of the wing; the 

 fore-wing itself shiny with distinct neuration, the hind-wing extending 

 for some distance beyond the inner margin of the fore- wing ; the spiracles 

 on the 3rd, 4th, 5th, 6th and 7th abdominal segments consist of a slight 

 oval depression, surrounded by an illdefined rim ; above the spiracles 

 on these segments is a deep oblique depression ; on the 8th abdominal 

 segment the spiracle is undeveloped ; the cremaster is rounded, 

 smooth and shiny ; the abdominal incisions very distinct, dull black 

 in colour. Dorsal view : The dorsal headpiece is prominent, extend- 

 ing beyond the prothorax, which is clearly defined ; the mesothorax 

 swollen dorsally, and extending laterally into the fore-wings ; the 

 central part of the metathorax, narrow, wider at the sides where it 

 extends into the hind-wings. The 1st, 2nd, 3rd, 4th and 5th abdo- 

 minal segments moderately uniform in width, the succeeding segments 

 gradually decreasing in size until the cremaster is reached. Each abdo- 

 minal segment, after the first, consists of : (1) A dark intersegmental 

 membrane. (2) A black transverse ridge. (3) A thinner pale band. 

 (4) A line of longitudinal black ridges bearing series of prominent 

 rough points (by which pupal movement is effected). (5) A shiny belt, 

 fading back into the dark hinder part of the segment (and comprising 

 the greater part thereof), and further into the intersegmental membrane. 

 Movable incisions occur between abdominal segments 3-4, 4-5, 5-6, 6-7 

 in the female, also 7-8 in the male (probably also between 1-2, 2-3 in 

 both sexes). The cremaster rounded, with a number of short black 

 points. The anal segment seems to be formed by the fusion of 

 the 9th and 10th abdominal segments. [Description made July 13th, 

 1897, from pupae collected at Waxham, on the Norfolk coast, by Mr. 

 Bacot.] Speyer notes the pupa as black, but the back of the abdomen 

 of a somewhat paler colour, with green segmental incisions. 



Dehiscence. — In dehiscence, the pro- and mesothorax split medio- 

 dorsally. The head, antennae and tongue separate from the other 

 appendages ; the leg-cases disjointed from the base of the antennae, 

 and the latter from the wings. 



