122 PAPIRIUS. 



The tarsus itself is short and bare. The appendages of 

 the tarsus are (Pl.LXV,figs. 2 and 3j manifestly arranged 

 on the same type as in 8. fuscus, though the details so 

 far differ as to offer good specific characters. The outer 

 spine {a) is not elliptic, but resembles in outline the blade 

 of a clasp knife, and has two strong teeth on the under 

 edge. The second or inner appendage (h) also presents 

 well-marked differences. The basal portion bears a 

 small spine, and in the first foot gradually contracts ; 

 while in those of the third pair there is a sudden 

 diminution immediately beyond the basal spine. The 

 tip of the filament appeared to me to be slightly swollen. 

 In this character it presents much analogy with the 

 so-called " tenent hairs " described by Mr. Tuffen 

 West in the twenty-third volume of the ' Transactions 

 of the Linnean Society ;' see, for example, his figures 

 of these hairs on the tarsus of Ocypus olens (PI. 

 XLII, fig. 247*), or those from Mylahris cichorice (PL 

 XLII, fig. 29). In both these cases, however, 

 the hairs are very numerous, and their combined 

 action is, no doubt, sufficiently efiicacious ; but in 

 this case, where we have only a single hair on each 

 foot, its action must be very slight. On each side of 

 the back is a dorsal tubercle. The spring (PI. LYIII, 

 fig. 10) in this species is rather longer and slenderer 

 than that of the preceding. The basal part gradually 

 tapers to the extremity, which is sparingly clothed 

 with short hairs, but no trace of the three long tenent 

 hairs which occur in Smynthurus Bushii. The terminal 

 segment is, as usual, free from hairs ; it is lanceolate, 

 and bears on its inner side from twenty-five to 

 thirty-five small teeth; between the two last is a 

 rounded knob, which occupies the space of about 

 three teeth, but does not project beyond the general 

 outline. The ventral tentacles are very similar to 

 those of S. Bushii. They are provided with the same 

 gland-like papilla3, and fulfil doubtless, the same 

 functions. 



PI. LXIV, fig. 13, represents the palpus of this species. 



