1895.] 63 



I have only taken one imago, an exceedingly worn ?, on July 

 ISth, 1888, though I have often searched for it. Those bred in 

 captivity have, like most of the genus, great running powers. 



The larva makes itself a case out of lichen and particles of stone, 

 with a silk lining, something like that of T. i^eUionella, but much 

 neater and better shaped and differently formed at the ends, which 

 are similar to each other. The case lies quite close to the lichen- 

 covered rock, which it resembles so closely that it is difficult to see. 

 The rather flat case is less than half as deep as it is broad, and nearly 

 three times as long ; the transverse section in the middle is slightly 

 convex below, and more so above. The upper half projects consider- 

 ably beyond the lower at each end, the extreme portion of the lower 

 side forming a kind of flap, which is closely shut up against the top 

 part, when the larva retreats into its ease, and opens when the head is 

 protruded. This flap is so elastic that if, when the case has been lately 

 tenanted, it is bent open by a needle, it springs back and shuts on being 

 released. As a rule the larva, when it retreats into its case, leaves its 

 two long prothoracic bristles projecting outside, and it would naturally 

 be concluded that these were delicate organs of touch, especially as 

 they are moved about in different directions, independently of the 

 movements of the prothoracic segment, but I have not, on trying 

 them, found them very sensitive. At the base of this flap the case 

 is narrowest, but sw^ells out again a little near the end, which is 

 beautifully rounded, so as to fit against the inside of the top part. 



The measurements of a case containing a living larva, full-grown or verj nearly 

 80 (A), and of a second one containing a younger living larva (13), are as follows : — 

 Total length (A) 5-6 mill., (B) 46 mill. Greatest breadth (iu middle) (A) lOT 

 mill., (B) I'l mill. Breadth at narrowest part (about 1 mill, from caeh end) (A) 

 1-2 mill., (B) 1 mill. Breadth close to end (A) l-i mill., (B) 1-05 mill. Thickness 

 in middle (A) 0"9 mill., (B) 0'5 mill. Thickness at narrowest part (about 1 mill, 

 from end) (A) 0*5 mill. 



Length of flap (A) 07 mill. 



Length of projection beyond flap (A) 07 mill. 



Length of under-side between ends of flaps (A) -IS mill. 



This shows the great difference in shape between young and full- 

 grown cases. 



I have been particular in giving these measurements, as Major 

 Hering has sent me a translation from von Heinemann (Schmetterlinge 

 Deutschlands und dcr Schweiz, Abth , ii, Bd. ii, p. 5G), as folloijs : — 



" I have cases from the Taunus and from Rntisbon. The former are very flat, 

 1\ lines (German) broad, 3.\ lines in length, rounded on both ends and compressed 

 before them, covered with fine grains of sand, flesh-coloured (sic .'), with darker 



