238 



8. The posterior part of the right phallomere is composed of a dorsal lobe (fda in fig.31, 

 74) and a ventral tooth or ridge (pia in fig. 28, 29a, 77, 78). fda and pia are connected 

 along the right edge of the right phallomere, and they diverge to the left like the two 

 halves of an opened book. In Eurycotis pia is as large as fda (and two-pointed); in 

 Chaeteessa pia is much smaller than fda. 



9. The dorsal wall of the fda-lobe is sclerotised {Eurycotis: RIH in fig. 74; Chaeteessa: 

 RIA in fig.31). 



10. The posteroventral part of both RIF and RIB (fig. 28, 77; posterior to edge 16) extends 

 onto the pia-tooth. However, the sclerotisations of the anterior and of the posterior 

 parts of pia are connected in Chaeteessa (RIB) but separated in Eurycotis (RIF 

 anteriorly and RIG posteriorly, which articulate in A9). 



11. A large membranous area (17 in fig. 28, 77) is present at the posterior right edge of 

 the right phallomere, between the right margins of the sclerotisations of fda and pia. 



Homology is assumed for all these similarities, for all elements given the same name, and 

 for the compared sclerotisations taking the same relative positions. l.-U. are assumed to 

 be features of the common ground-plan of Blattaria and Mantodea. 

 A further similarity between Chaeteessa and Eurycotis is that the sclerotisation adjoining 

 articulation A3 posteriorly (RIB in fig. 28; RIF in fig. 74, 77) is separated from the dorsal 

 sclerotisation of the fda-lobe (RIA in fig.28, 31, 32, RIH in fig.74, 77) by membrane (4 

 in fig.28, 32, A8 in fig.74). The dividing Hues 4 and A8, however, are probably non- 

 homologous (discussion below). 



There are also some essential differences between Euiycotis and Chaeteessa: (1) The 

 separation or connection of the anterior and posterior sclerotisations of pia (compare 

 feature 10.). (2) Only Eurycotis has a sclerite R2 (fig. 77), which articulates with R3 (A7 

 in fig.75, 77) and RIF (A6 in fig. 75). (3) In Eurycotis the cbe-invagination has a summit 

 in the center of the right phallomere and becomes shallower to the left of this summit 

 (where R2 adjoins; fig. 75, 78); in Chaeteessa the cbe-invagination becomes continuously 

 deeper to the left (fig. 29a, 31). (4) Only Eurycotis has a tre-tendon in the anteriormost 

 dorsal wall of the fda-lobe (fig.74). (5) Only Eurycotis has the sclerotisations of pia (RIG) 

 and fda (RIH) connected with each other posterior to the membranous area 17 (by a 

 naiTow sclerite bridge; fig. 77, 78). 



As regards the right phallomeres of Mantoida and Chaeteessa, homology is quite evident 

 for most elements: Sclerite R3 has the same shape and position and a similar age-apodeme 

 (compare fig.28, 29a and 41, 43). The right posterior end of R3 articulates (A3 in fig.28, 

 41) with the sclerotisation adjoining posteriorly (RIE or RIB). However, only in Mantoida 

 the groove-shape of the sclerotisation extends from R3 (age) far beyond A3 onto the 

 posterior sclerite RIE (fig.41, 43). The posterior part of the right phallomere is, like in 

 Chaeteessa, composed of a large dorsal lobe (fda in fig.44) with a sclerotised dorsal wall 

 (RIE in fig.44) and a ventral tooth (pia in fig.41, 43) with dorsal and ventral sclerotisations 

 (RIE in fig.41, 43). However, in Mantoida the sclerotisations in the dorsal fda-wall and 

 those on pia are interconnected anteriorly by a broad sclerite bridge (RIE in fig.41, 44; 

 no membranous stripe 4 as in Chaeteessa, fig.28). Behind this bridge there is, like in 

 Chaeteessa, a large membranous area (17 in fig.41). In the ventral wall of the right 



J 



