270 



ORTHOPTERA 



CHAP. 



(Fig. 167) ; the tegmen of the Phyllium is very different, the radial 

 vein and all the parts behind it being placed quite close to the 

 posterior edge of the structure. A similar view is taken by 

 both Eedtenbacher and Brauer. The latter says/ " In Phyllium 

 (the walking-leaf) almost the whole of the front wing is formed 

 by the praecostal and subcostal fields ; all the other fields with 

 their nervures, including even the costa, are compressed towards 

 the hind margin into a slender stripe. In the hind wing the 

 costa is, however, marginal." Unfortunately no examination 

 appears to have been made of the male tegmen, so that we 

 do not know whether that of the female differs from it morpho- 

 logically as strongly as it does anatomically. It is, however, 

 clear that the tegmina of the female Phyllium not only violate 

 a rule that is almost universal in the Insecta, but also depart 

 widely from the same parts of its mate, and are totally different 

 and, for a Phasmid, in an almost if not quite unique fashion 

 from the other pair of alar organs of its own body. 



Fig. 157. Y^g^oi Phyllium scythe. (After Murray.) A, The whole egg, natural size ; 

 A', magnified ; B, the capsule broken, showing the true egg inside, natural size ; 

 B', magnified. 



We have already alluded to the resemblance to seeds displayed 

 by the eggs of Phasmidae. The eggs of Phyllium have been 



^ aS"^. Ak. Wicn, xci. 1885, p. 361. The nomenclature applied to the nervures 

 by these authors is not the same as that of Brunner ; according to their view the 

 wing o[ Phyllium, female, differs more from the Aving oi Blatta than it does accord-' 

 ing to a comparison made with the nomenclature we adopt. 



