90 Bulletin de la Société Entomologique d'Egypte 



Fahre foresaw and oven staled the action of the 

 blood in his study of tlie Grasshopper. Tliis able obser- 

 ver wrote ( 1(S79, VI, j). 'iUo, and 1917, p. 257): "To unfold 

 these poor bundles, it is suflicient that the organism 

 should act here as a force pump and drive into the 

 channels previously prepared a flood of humours kept 

 in reserve for Ibis mom.Mit which is the most labo- 

 rious of all. With this system of channels ready 

 beforehand, a tine injection explains the spreading." 



Fahhi; would certainly have actually seen the 

 irculation in the alar system if, instead of cutting 

 ofT a wing, he had placed ujider the microscope a 

 wing still joined to the living body. 



Joi'SSKT nKBi:Li,HSMK(I877)showed that the nymph of 

 Libellula depressa l)egins by storing air in the digestive 

 tube(l). This becoming swollen pushes l)ack the other 

 organs against the integuiiienf. I'nder this strong 

 pressure the blood is driven with force towards the 



1. We tiave (jhscrved Hit' slorinjj; of air in (he digestive 

 tube of the locust, Schislocercd pereyriiui, and of several 

 I-^gyptinn species of Mdiilidae previous to tiie moults. The 

 more or less prolonged period during which insects abstain 

 from food before moulting gives tlicm the opportunity of 

 Idling the digestive tube with air. If Ihc head of a locust 

 about to moult is pulled oil', the alimentary canal easily 

 follows and is seen to he very mucli distended with the 

 stored air. It sometimes happens that the ])ressure exerted 

 by die blood in the cervical region bursts not only the skin 

 about to he cast but also the newly formed integument 

 beneath. In this ease, which is not of fretpient occurrence, 

 flie insect invariably dies without being at)le to complete ils 

 oiouU, The following is Iraidatcd from IIknxeocv, lOO'i p.p. 

 300 to r)02;— " KiiNCKRL dIIercilais (18'.H)) lias shown that 



