86 Annals Entomological Society of America [Vol. Ill, 



ing to Joly (7) who has worked on the structure of the egg of 

 Phyllium crurifoliiim "ce tissu prcsente la plus grande analogic 

 avec celui du liege, c'est-k-dire qu'il est forme de cellules irregu- 

 lieres (carrees, pentagonales, sexagonales) tres petites et tres 

 serrees. La couche exterieurc qui recouvre cette coque, est 

 beaucoup plus epaisse et, comme nous I'avons dit, elle ressemble 

 li I'ecorce loigueuse du Chene-liege, dont elle a la legerete. Nou- 

 velle et curieuse analogic de notre insecte avec le regne vegetal: 

 analogic qui devicnt plus complete encore, quand on songe que 

 I'oeuf du Phyllium est muni d'un opercule qui s'ouvre lors de 

 I'eclosion, a la maniere d'une pyxide." Brongniart* who has 

 ■examined the eggs of Phyllium pulchrifolium also compares the 

 ^'xternal envelope to that of cork. According to Henneguy (5) 

 who has also worked on the histological structure of the egg- 

 capsule of Phyllium crurifolium, "L'ensemble de la couche 

 externe presente une grande analogic de structure avec la partie 

 libericnne d'une ecorce de dicotyledone traversee par les rayons 

 m^dullaires." 



A cross section through the operculum of the egg of Diaphero- 

 mera femorata shows that the space between the floor and top of 

 the dome is partially filled with chitinous deposits, which, accord- 

 ing to a vegetable histologist, resembles somewhat the thin 

 walled parenchyma of plant tissue, except that no middle lamella 

 Avas discernible (Fig. 4, a). Miiller (13) describes the chitinous 

 deposition as "ein zelliges Gewcbe aus dcutlich scchseckigen oben 

 <jffenen Zcllen bilden. Dies schcint einer besonderen Beachtung 

 werth, da die Erchcinung eines regelmassigen zelligen Gewebes in 

 •der Organisationsstufe der Insecten gewiss die seltenste ist." 

 Jt would be rash to speculate as to the formation of this chitinous 

 deposition since the manner in which the operculum is formed 

 is obscure. Sharp (16) suggests two methods: "first, autotomy 

 of the pole of the egg; second, adhesion of the mass of matter 

 from the adjacent nutrient chamber, to form as it were a very 

 imperfect second egg." 



"Hilar area, cicatriciila or Narhe'' of Egg: On the outer 

 surface of the exochorion, of the slightly more convex side of 

 the egg is an elliptical region resembling somewhat the hilum 

 of a seed. Sharp (16) calls this region the "hilar area," Miiller 

 (13) the "cicatricula" or "Narbe," Leuckart (10) and Hcymons 

 (6) also use the term "Narbe." The margin of this "hilar area" 



* Paper not accessible. Quoted from Henneguy 's (5) paper. 



