<S(J Bulletin de la Société Entomologique d'Egypte 



which Iht' bk)0(l passes. The piinci])al or loiii^iluchnal 

 ii('i\iir('s contain in addition an easily visible liaclieal 

 tube ol' unil'oiin ealil)re contiguous with the dorstd 

 hwer. while the secondary or transverse n(Mvures do 

 not possess such a tube. ( i-'igs. 14 and I,')). 



V\r,. ]b.—ljni)iis(t C(icii(i. — Hind \vin,i; fixed durinjf llie 

 uiifoldin.i; stage. Cross section liirongh a lontj;iludinid vein 

 slio\vin;4, aiiovc, llic trachea conlignous willi the upjicr hiyei- 

 ol' tlie \vin,!4 : l>clc)\v, the i)critraelieal elianncl containing a 

 few hlood coi-puscies; and on eitlier side cells of Hie inters- 

 titial tissue. 



The nioxenient of the hlood can be easily Collowed 

 thanks to the small nucleated cells large numbers of 

 which lloat in that liciuid. In the portion which I 

 am examining these globules all How in the same 

 direction which is cenlrilugal. 'l"he whole mass of 

 blood shows very obvious beats, about ."JO to the mi- 

 nute, prol)ably synchronous with the contractions 

 ol' the alulomen. The movement ol theglol)uIes reuiindv; 



