120 liidlctin de la Socirlc Eiitoìnoluyiqitc d'Eijijide 



There is in the mule larva a peculiaiily which, 

 so tar as 1 kjiovv, has not vet been described. At the 

 time of Ihe I'ormatioii of the himellae, their edges 

 are joined to one another so as to form a conti- 

 nuous sheath transversely striated. Fi^. [\ drawn 

 from a male which died durinj^ the last moult is 

 \cry instructiAc from this point of view. The frag- 

 ment having been tr(>atcd with caustic ])otash, the 

 larval cuticle is 1rans{)aierd enough to alloAA the final 

 or imaginai antenna to be seen already complete 

 within the sheath. It is seen to be composed of twp 

 parts : i" the liui>L\ c(jmposed of Ihi; suc- 

 cessive joints ; >" the Icclli, now se[)arate and 

 inserted in pairs on llic trunk. The teeth are set at 

 an angle with respect to the striae oi the sheath. It 

 is nevertheless obvious that the teeth of the imaginai 

 antenna correspond primarily to the laival lamellae 

 which are cdosely luiiled during the period of forma- 

 tion. In fact it is on the inner surface of these 

 lamellae that the teeth of the imaginai antenna are 

 formed by different iatioti of the epideiaiis. The slant 

 of the teeth is (iuc ])artly to the separation of the 

 cuticle whicli starts at the base of tlie 3rd joint and 

 partly to their own growth. Vs they become too long 

 for the sheath the\ are bound to become slanting. 



Fig. f) represents the other antenna of the same 

 specimen, but as the imaginai antenna has not been 

 drawn the larval lamellae are belter seen. Tli(> exuviae 

 of the antennae of an adult male show the same ap- 

 pearance. 



From the histological point of view the antennal 

 lamellae of the larva have the same appearance as 



