192 



(2) The posteroventral part of the Ive-pouch is even more reduced than in Archiblatta 

 (compare fig. 55 and 68). (3) A deep notch (9 in fig. 63, 69) separates the right main part 

 of the vla-lobe from the remaining parts of the left complex. This notch lies within the 

 vla-lobe and does not correspond to the left edge 61 of via in Tryonicus (compare fig.63 

 and 87). Like in the other species, the posterior part of L2 extends onto a process (paa 

 in fig. 67, 68), which might thus be regarded as paa (compare fig. 55). That paa is 

 completely sclerotised is primitve compared with Archiblatta, but, like in Archiblatta, paa 

 and its L2-sclerotisation have been far removed from pda and its L4-sclerotisation (fig. 65). 



The muscles of Eurycotis, compared with Polyphaga and Mantoida, confirm the assumed 

 homologies: Eurycotis also has a muscular connection 13 from L2 to the posterior part of 

 LI (13a,b,c in fig.71, 13 in fig.50, 128; compare in 6.1.) and a muscle 14 from L2 to the 

 left edge of the left complex (fig.71, 50, 132). The 14 of Eurycotis and Mantoida and their 

 insertion areas are extremely similar and reveal an additional feature of the common 

 ground-plan of Blattaria and Mantodea: 



18. 14 (fig.50, 71) runs from L2 in the Ive-pouch to the swe-apodeme on L4- 

 sclerotisations in the left edge of the left complex (sclerites L4 or L4H), where it 

 inserts immediately ventral to muscle 12 (fig.49, 70) coming from the pne-pouch. 



Several muscles of Eurycotis run from the ventral wall of the left complex to the Ive- 

 pouch: 16b (fig. 70, 71) runs to the ejaculatory duct near its opening, like 16b in Polyphaga 

 (fig. 132) and the ventral part of 16 in Mantoida (fig. 52). Another muscle (16a in fig.73) 

 runs to the anterior ventral wall of Ive, and homology with either 15 or 16a of Polyphaga 

 (fig. 133) and Mantoida (16a = dorsal part of 16 in fig.50) seems possible. Two other 

 muscles (15a,b in fig. 72) insert on the ventral left edge of the Ive-pouch, somewhat hke 

 15 in Polyphaga (fig. 133); however, the ventral insertions of 15a and 15b are far posteriorly. 

 Thus, for 15a,b and 16a of Eurycotis the homologies are not completely clear, but I suppose 

 that the relations expressed by the designations are the most probable. 



Concerning the common ground-plan of Blattaria and Mantodea, one question remains 

 open: It is not decidable whether the right parts of L2 and Ive are level (like in Mantodea) 

 or up- and recurved (like in Blattaria). 



The definition of the regions of main sclerite L2 (fig. 324) is based on the primitive arch- 

 shape of L2, which is present in its typical form in Mantoida, Archiblatta, and Polyphaga. 

 From the left to the right four L2-regions are distinguished: 



- L2d (dorsal): The sclerotisation of the process paa. 



- L2p (posterior): The part of the L2-arch in the left posterior part of the Ive-pouch. 



- L2a (anterior): The part of the L2-arch in the anterior part of the Ive-pouch. 



- L2m (median): The part of the L2-arch in the right part of the Ive-pouch. L2m has an 

 articulation A2 with LI. 



- L2v (ventral): This is not defined as a separate region of L2. This term is used (mainly 

 in fig.324) if large parts of L2 have invaded the ventral wall of the Ive-pouch; these 

 parts of L2 are not necessarily homologous in the species concerned. 



The up- and recurved right parts of L2 of Blattaria belong to the regions L2m and L2a. 



