New Species o/ Prionocalua /row Ecuador and Peru. 503 



less apparent from the outset of their formation. As I have 

 ah-eady said, however, growth proceeds with the greatest 

 slowness ; it follows therefore that during the time which 

 elapses before the next moult the part in process of growth 

 barely forms a minute projection from 1 to 2 millim. in length. 

 It is covered by a thin protective cuticle of a brown colour, 

 moulding itself exactly upon the rudiment of the limb, which 

 up to the present shows no separation into joints. It is only 

 after the next moult that the limb, beginning to be of appre- 

 ciable length, will show any distinct traces of division into 

 tarsal joints. The growth is so slow that it is only after two 

 or even three moults that the mutilated limb is completed and 

 becomes serviceable to the insect *. 



It is interesting to compare the slowness of the growth of 

 parts in process of regeneration atfer artificial removal, as 

 well as that — much less marked nevertheless — of limbs in- 

 tended to replace those removed by self-mutilation, among 

 Phasmidas with the marvellous rapidity of such growth which 

 has been found among the Mantidae and Blattidse. Whilst 

 among the latter limbs regenerated after self- or artificial 

 mutilation may begin to be of use to the insect immediately 

 after the next moult, in the Pliasmidai limbs in course of 

 regeneration cannot become useful until after the second or 

 third moult. I have noted that the same holds good for 

 the Orthoptera saltatoria. 



LXVII. — New Species of the Coleopterous Genus Prionocalus 

 from Ecuador and Peru. By Chas. O. Watkkhouse, 

 V.P.E.S. 



The British Museum has recently received a few specimens 

 of Lougicorns of the genus Prio7iocalus. One I refer with a 

 slight doubt to P. cacicus, White, but in tlie type the tubercle 



* In the most perfectly regenerated limbs there is a tetramerous tarsus. 

 I have nevertheless obtained after cuts made upon the third joint of the 

 tarsus : — 



1. A pentamerous tarsus with incompletely separated joints. 



2. A pentamerous tarsus as perfect as the normal one. 



3. A bent and monstrous tarsus of six incompletely separated joints. 

 But these are rare exceptions to the rule. Tetramery after regeneration 



has been determined among the Phasmidas not only in the four genera I 

 quoted in my previous papers, but also in Aiwhiale, Acanthoderus, Lopa- 

 phus, Diapheromera, and probably in Cyphocrania, Diura, and Bacteria 

 mexicana, the total number of species of Orthoptera cursoria in which 

 tetramery has been determined being thus twenty-tive. 



