APTERYGIDA ALBIPENNIS. 59 



MALE IMAGO (PL V, f. 7). --Col our pale sienna-brown, 

 legs, antennae, and callipers usually paler, pubescent. 

 Size rather less than typical F. auricularia. Length 

 13-16 mm., length of callipers 3-4*5 mm. Antennae 

 of 12 segments. Pronotum with hind margin rounded. 



o 



Elytra free, hind margin straight. Wings absent. 

 Abdomen covered with fine hairs; with bright dark 

 scent-folds on segments 3 and 4 ; a tubercle on each 

 side of the anal segment ; pygidium squarish, notched 

 behind. Callipers (fig. 2, no. 7) slender, hairy, only 

 slightly incurved, undilated, bearing one tooth at about 

 the middle of each branch of the callipers on the inner 

 side, and a blunt one at the base ; tips not contiguous. 



FEMALE IMAGO.- -Much as the male, except that the 

 anal segment is narrow, and without tubercles, while 

 the callipers are nearly straight and unarmed. Length, 

 12-14 mm., length of callipers 2'5 mm. 



VARIATION.- -In dried examples there is considerable 

 variation in size ; but probably this would be less 

 conspicuous in the living insects. Some are much 

 darker than usual, the deeper colour extending to 

 antennae, legs, and callipers (fig. 3, no. 6). 



DATE.- -Westwood's Ashford specimens were taken 

 in June (fide C. W. Dale). B. S. Harwood has taken 

 it on 31 August and also in September. Porritt took 

 it profusely in September 1913, while Chitty found it 

 in evidence from the end of July till the 10th of 

 October, 1904. Apparently, like F. lesnei, it is mature 

 in its British localities in late summer and autumn. 

 Nothing seems known about the earlier stages, at any 

 rate in this country. 



HABITS. According to C. W. Dale, Westwood's 

 historical specimens were taken (scantily, Burr) in 

 a nursery-garden at Ashford. A. J. Chitty found 

 them plentifully in the autumn of 1904 in the same 

 district in which West-wood obtained them nearly 

 three-quarters of a century before. They occurred 

 throuo-hout the district in suitable localities, which 



