THE BLOOD, ETC., IN THE WING-VEINS 147 



and in the wing-veins at a later period, blood-corpuscles which are 

 more or less gorged with nutritive material, and also the "balls 

 of granules ? ' of Weismann, which are perhaps the " single fat-body 

 cells " detected by Semper. Schaeffer also states that into the 

 hypodermal fold of the rudiments of the wings pass peculiar forma- 

 tions of the fat-body and traclieal system, and connected with the 

 fat-body are masses of small cells which by Schaeffer are regarded as 

 blood-building masses. 



Fine nerves have also been detected within the veins, Moseley 

 stating that a nerve-fibre accompanies the trachea in all the larger 

 veins in the insects he has examined (Fig. 162), while it is present 

 in Melolontha, where the trachea is absent. 



LITERATURE ON THE WINGS 



Jurine, L. Nouvelle niethode de classer les Hyme'nopteres et les Dipteres. 



Geneve, 1807, 4, pp. 319, 14 Pis. 

 Observations sur les ailes des Hyrne'iiopteres. (Me"rn. acacl. Turin, 1820, 



xxiv, pp. 177-214.) 

 Latreille, P. A. De la formation des ailes des Insectes. (Mem. sur divers 



sujets de 1'histoire naturelle des Insectes, etc. Paris, 1819. Fasc. 8.) 

 De quelques appendices particulSers du thorax de divers Insectes. (Mem. 



du Mus. d'Hist. nat., 1821, vii, pp. 1-21, 354-363.) 

 Chabrier, J. Essai sur le vol des insectes. (Me"m. du Mus. d'Hist. nat., 1820, 



vi, pp. 410-476; 1821, vii, pp. 297-372; 1822, viii, pp. 47-99, 349-403.) 



Separate, pp. 328, 13 Pis. 

 Burmeister, Hermann. Handbuch der entornologie, i, 1832, pp. 96-106, 263- 



267, 494-505. 



Untersuchungen liber die Fliigeltypen der Coleopteren. (Abhandl. d. 



naturf. Ges. Halle, 1854, ii, pp. 125-140, 1 Taf.) 

 Romand, B. E. de. Tableau de 1'aile supe'rieure des Hyme'nopteres, 1 PI. 



Paris, 1839. (Revue Zool., ii, pp. 339; Bericht von Erichson fur 1839, 



pp. 54-56.) 

 Lefebure, A. Communication verbale sur la pterologie des Lepidopteres. 



(Annal. Soc. Ent. France, 1842, i, pp. 5-35, 3 Pis. Also Revue Zool. 



Paris, 1842, pp. 52-58, 1 PI.) 

 Deschamps, B. Recherches microscopiques sur 1'organisation des e'lytres des 



Cole'opteres. (Ann. sc. nat., sdr. 3, iii, 1845, pp. 354-363.) 

 Heer, Oswald. Die Insektenfauna der Tertiargebilde von Oeningen und Radaboj., 



1847, 1. Teil, pp. 75-94. 

 Newman, E. Memorandum on the wing-rays of insects. (Trans. Ent. Soc. 



London, ser. 2, iii, 1855, pp. 225-231.) 



West wood, J. 0. Notes on the wing- veins of insects. (Trans. Ent. Soc. Lon- 

 don, ser. 2, iv, 1857, pp. 60-64.) 

 Loew, H. Die Schwinger der Dipteren. (Berlin, Entom. Zeitschr. , 1858, pp. 



225-230.) 

 Saussure, H. de. Etudes sur Paile des Orthopteres. (Ann. scienc. nat., 



5 ser. x, p. 161.) 

 Schiner, J. R. Ueber das Fliigelgeader der Dipteren. (Verhdl. k. k. Zool.-bot., 



Ges. \Vien, 1864, pp. 193-200, 1 Taf.) 



