Atto species of Vx'xowocoXna from Ecuador and Peru. 503 



less apparent from tlie outset of their tormatioii. As I have 

 already said, hmvever, growth proceeds with the greatest 

 slowness; it ibllows therefore that during the time which 

 elapses before the next moult the part in process of growth 

 harely forms a minute projection from 1 to 2 millim. ia length. 

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

 moulding itst-jt exactly upon the rudiuieiit of the limb, which 

 up to the present shows no si'[)aralioii 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 

 j)arts in j)rocess of regeneration alter artificial removal, as 

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

 tended to replace those removed by self-mutilation, among 

 Phasmidic with the marvellous rapidity of such growth which 

 has been found among the Mantid^e and Blattidte. Whilst 

 among the latter limbs regenerated after self- or artilicial 

 mutilation may begin to be of use to the insect immediately 

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

 rrgeneration cannot become useful until after the second or 

 third moult. 1 have noted that the same holds good for 

 the Orthoj)tera saltatoria. 



LXVII. — yew Species of the Coleopterous Genus Prionocalus 

 from Ecuador and Peru, liy (JhaS. U. WatekhoUSE, 



V.P.E.8. 



The British Museum has recently received a few specimens 

 of Longicorus of the genus I'rionocalus. One 1 refer with a 

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



• In the mitst perfectly regenerateil limb- tliere is a tetramerotis tarsus. 

 I have nevertheless obtained alter cuts made upon tiie 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. 'J'etramery after regeneration 



has been determined among the IMiasmid.e not only in the four genera I 

 quoted in my previous papers, but also in Anchiale, Acanthuderus, Lopa- 

 phit^, Diaphi rutin ra, and probably in Cyphucrania, Diura, and Bacteria 

 ine.vicana, the total number of sjwcied of Ortlioptem cursoria in which 

 tetramery has been determined being thus tweuty-bve. 



