6(i iìiilh'tin tir hl Socìctr ICii1oiiu>ìogi(iiic d'Eyiflìtr 



throe-jointed (fij;. o). Measiircd >\itli a micronielor, 

 these joints A\ere round to bo -340, 204 and 221 \i 

 respeclively, making a total ol' TGo^fx; it will be 

 seen that the first joint is nearly as long as the other 

 t^^o together. 



riie lenglh ot the cerei of tiie athilt female is 

 •"> mm. and of the anuit male 7.5 or about 10 times 

 that of Ihe ne\Aly hatched larva. 



Tlie first joint is relatively the shortest and seems 

 to hav(> divided nian\ times. I was not able lo 

 ascertain whether new joints are formed elsewhere. 



The most important result of this enquiry is the 

 pcculiai' method of develo|)nient of the antennae and 

 ceici ill I Ids insect . 



NN hilc the other appendages, legs and mouth 

 parts, have from the first their final shape and all 

 their i)arts, then> are two kinds of oigans (three if we 

 include the wings/, the antennae and the cerei, which, 

 incomplete at birth, only reach their full develop- 

 ment at the beginning of the adult staGi-. 



It would be interesting to make similar measure- 

 ments in Locustidae, the Gryllacris of Ceylon and 

 Orthoplera in general as well as in Crustacea with 

 long antennae such as crayfish and crawfish. 



Perhaps a comparison of the results would com- 

 plete usefully the appioximate results put forward in 

 this article. 



