78 ENTOMOLOGISK TID^^KRIFT 1894. 



III. Propagation. 



Having treated one of the females with caustic potash and 

 then cleaned it in glycerine, something still remained in its in- 

 terior, incommoding the study of the skeleton and the tracheal 

 system. Having taken it out and examining it I became astonished 

 by finding the skin of a gigantic young and skins of several 

 smaller young ones of very different size. These skins being 

 very distended and therefore not giving any trustworthy idea of 

 the shape and real longitude of the young I did clip a longitudinal 

 aperture in the back of the other female and found 6 young ones. 

 The greatest one was situated rather posteriorly in the abdomen, 

 the other in front of it and the smallest one far forward under 

 the metanotum. They were all of different size, the largest one 

 (PI. 3, fig. 11) gigantic, in his convoluted condition having the 

 length of 2,8 ■"'" from the anterior to posterior margin, conse- 

 quently much longer when being stretched out in full length and 

 then, I think, attaining almost ^/?, of the length of the mother 

 (ii,S '""^) the smallest one was in the convoluted state 1,2 """ long. 

 Perhaps it had been possible to find still i or 2 very small young 

 or ova, if I had undertaken a regular dissection, but the rare 

 animal should be treated with lenience. 'Hie largest of the young 

 ones [?\. 3, fig. 11) is convoluted in such a way, that the cerci i^c) 

 are lying along the upper side of the head; all the segments of 

 the body are easily seen kelson excepted) and the set;ii on the 

 thorax, the abdominal tergites and sternites, the cerci and the 

 legs are well developed. The antennae (a) have but 8 joints and 

 are still inclosed in the skin from an earlier larval stage, much 

 surpassing its tip. On the ventral side of the thorax is seen a 

 folded mass of membranous skin (d). In the larva coming nearest 

 as to size to the former the body is covered by a thin membrane 

 Avithout set;v, but under this is seen the above described setœ more 

 feebly developed. In the earlier stages such seta; are wanting. 

 The most remarkable feature is, however, that in the 4 greatest 

 specimens issues from the membrane between the head and the 

 protergum an unpaired organ (b), slender at the basis but rapidly 

 rather stout, the exterior side and the lateral margins of which 

 are lacerated in a different way in the difterent larvae; to the best 



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