hearivfj on the orujin of Insects. 



10.5 



Iff. /• 



Fig. 7. ^ Blafta,^ sp. Appendages of the eighth sternum or anterior gona- 

 pophyses, in a specimen of the apterous female which appears 

 to have undergone the last ecdysis. No part of the sternum (.sf) 

 is shown in the figure ; i, the setulose endopodites (i^nife-bladc- 

 like processes of Prof. Huxley), answering to the two long> 

 many-jointed, and setulose styles forming the anterior elements 

 of the ovipositor (5, 5) in Machills ; in an earlier stage than 

 that here figured they are distinctly two-jointed; they are articu- 

 lated, not to the sternum, but to the inner ends of two pieces 

 (the protopodites) which are attached to the sternum and are all 

 but confounded with it ; externally to the endopodites two short 

 and depressed teat-shaped and sparsely setulose appendages, 

 which evidently homologizc with the cxopodites of MachlUs, 

 and the discovery of which, and of their homologucs in the 

 succeeding somite, estaljlishes the perfect morphological identity 

 of the gonapophy'ses of female BlatUdce with the ovipositor of 

 Macliilis and of Lep'isma, are attached to the posterior margins 

 of the same two pieces, from which they are marked off by a 

 faint circumferential inflection of the integument. In the earlier 

 stage above referred to, the endopodites at their bases as dis- 

 tinctly curve inwards and backwards as the homologous parts 

 in Macliilis are seen to do in fig. 6. The dotting is intended 

 to represent the epidermis and subjacent tissues, which have 

 contracted in the spirit and shrunk away from the chitiuous 

 cuticle. 



