186 Transactions of the Society, 



exception of the first and of the anal segment, are supplied in the 

 same place with prominent rounded elevations or cushions which 

 infringe on the anterior edge of the preceding segment. These 

 appendages carry nine to ten parallel rows of very minute dark- 

 coloured teeth, giving them a resemblance to microscopical convex 

 curry-combs. In front of each row of these teeth, and standing at 

 some distance, one much stouter spine is visible. 



The anal segment terminates in five conical and somewhat in- 

 curved fleshy appendages, one of which is ventral and much larger 

 and broader than the others. This appendage carries near its apex a 

 large bunch of short curved bristles, while those opposed to it bear 

 several tufts of similar bristles, and the intermediate appendages are 

 quite glabrous. 



The total length of this larva is 5*10 mm. The length of the 

 anal segment including its appendages is • 66 mm. ; that of the three 

 thoracic segments 0'66 mm., while the middle segments of the 

 abdomen measure 0*45 mm. in length, by 0*90 mm. in width. 



The chinitous mandibles are distinctly visible ; they appear, as far 

 as I can make them out, to be widely three-lobed or toothed, and to be 

 in communication with two long internal chitinous rods, with slightly 

 swollen heads, which terminate as far back as the last thoracic 

 segment. 



Pupa of Male. — The pupa-case, after the imago has escaped 

 through a dorsal slit in the mesonotum, shows distinctly the three 

 sternal divisions of the thorax, as well as the various segments of the 

 abdomen. These are eight in number, unless the anal terminal 

 process is considered as a segment, in which case the abdomen has 

 nine segments. 



The sheaths of the legs are quite free, bag-shaped, distinctly 

 jointed, rounded at the ends. The hinder ones are convolute. Tbe 

 mesonotum shows a median transverse depression. The total length 

 of the pupa is 4 • 50 mm. 



As during my flying visit to Biarritz I found only one larva, and 

 a single pupa, from which the perfect insect, a male, was escaping, 

 my material has proved too scanty for a completely satisfactory study 

 of the external metamorphoses of this insect, the further elucidation 

 of which I must leave to some more successful collector, who should 

 be on the hunting ground as early as March or the beginning of April, 

 in order to secure the younger states of our insect. 



