82 Bulletin de la Société Eniomolo^igiie d^Egypk 



The circiilalion of hlocd in Ihc wings ol" insects 

 bolh newly monlted ;in(l liilly develojietl has already 

 l)een observed : 



By (l.MU s in newly enieri^ed drai^on Hies, in Ej>he. 

 lììcra lutea and lììarf/inala, (^hifiso/xi j)eila, Laiìipyris 

 iUdicd ixudsplendidiild, lihizolror/iis ^ohlilidlis. Dijtiscns ; 



lîy Imiiu-;m5i:i!(. in Maiiiis ; 



1ÌV BrKMi;isri:ii in Hrisidlis Iciiax and iieiuoruiu ; 



lìy TvHi'.ia. in Mnscd Doim'slicd ; 



lîy ß()\vi;iU'.ANK (1.s;î7) in (Ihnjsdpd pcrhi. 



Quoted Troni Ni.wi'OMr (LSiiU, p. 9S()), and Packard 

 (1898. p. 410). 



I add to the al)ü\e list the observations of Xh.olkt 

 (1847) on the eirenlation in the elytra of the lady bird, 

 ( ('coccinella ). those of Mosklkv (1871) on the wings ol" 

 the cockroach, and finally tiiose of Fh. Biu)C.iii-:r (191(5) 

 on the motions of the blood in the elytra and wing\, 

 of Diiliscus. 



VI. The Histology of the Wing. 



The wings ol' insects are mere e\[)ansi()ns oi- folds 

 of the epidermis. Their hollow, flattened into a slit, is 

 continuous with the body cavity and can receive from 

 it tracjieae, peritracheal sliealhs, bhjod, tendon lila- 

 ments, (active when the wing clones), perhaps even 

 nei\(' lilaments. 



11 is indeed as ex|)ansions of the integument that 

 the wing rudiments appear in the Mantidae. Entirely 

 absent at the time of hatching, these rudiments appear 



