234 M. E. Bordage on the Absence of Regeneration 



front, with a complete marginal stria ; the metasternum also 

 has a somewhat similar and independent stria, but the stria is 

 without the sinuosity ; the first abdominal segment has a 

 well-marked lateral stria ; the anterior tibiifi are armed with 

 two strong teeth, the apical one bifid, and three small ones 

 behind. 



Hister meridanus may be associated with H. nodatus and 

 H. gihberosu.9, Lew, 



JJab. Yucatan [Donchier] . Two examples. 



[To be continued.] 



XXX. — On the Absence of Regeneration in the Posterior 

 Limbs of the Orthoptera saltatoria and its probable Causes. 

 By Edmond Bordage *. 



Up to the present opinions have been divided with regard to 

 the regeneration of the posterior limbs of the Orthoptera 

 saltatoria. Among naturalists denying the possibility of such 

 regeneration I may mention Heineken, Graber, Durieu, 

 Frdddricq, Contejean, Werner, and PeyerimhofF. Among 

 those who admit it I may mention Professor Griffini (of 

 Turin). 



In tlie attempt to settle this debated question I undertook 

 a very large series of experiments upon representatives of 

 three families of Orthoptera saltatoria, choosing for my subjects 

 Phylloptera laurifolia and Conocephalus differens among the 

 Locustidse, Acridium rubeUum among the Acrididte, and 

 Gryllus capensis among the Gryllidas. 



The experiments in question have led me to the conclusion 

 that regeneration of the jumping-legs does not take place. I 

 have, in fact, not been able to find the least trace of regene- 

 rative power. 



Here is a fact which at first sight seems to be contrary to 

 the law of Lessona, for the jumping-legs are those which are 

 most exposed to injury by enemies, and can be detached from 

 the body by self-mutilation as a means of escape, as well as 

 t« casting the skin \ea;uvial self-mutilation^. We shall see, 

 however, that this case by no means forms an exception to 

 the law of the celebrated Italian biologist. 



I have in fact been able to note with regard to larvae kept 

 in captivity how difficult the moults became after the loss of 



* Translated from ' Comptes Rendus,' cxxix. (July 10, 1899) pp. 120- 

 123, by Wilfred Mark Webb, F.L.S. From a separate impression 

 communicated by the Author. 



