64 Annals Entomological Society of America [Vol. IX, 



terms it the "katopleura" in the roach, but in the Forficulidae 

 he appHes the term "katopleura" to an entirely different 

 sclerite. 



In Forficiila the condition is quite different from that found 

 in Periplaneta. In the prothorax the precoxale may have 

 fused with the trochantin and episternum following which there 

 was a secondary marking off, of a triangular sclerite, con- 

 sisting partly of trochantin and precoxale (Fig. 8, tni), and of 

 two narrow sclerites extending along the anterior margin of the 

 episternum (Fig. 8, pCi), which represent a part of the precoxale, 

 the rest of it having fused with the episternum. Another view 

 is that the triangular sclerite (Fig. 8, tni) represents the entire 

 trochantin and that the two narrow sclerites along the anterior 

 edge of the episternum represent the entire precoxale (Fig. 

 8, pci), which has become reduced in size. The precoxale in 

 Diapheromera is very narrow and reduced in size, thus showing 

 that such a condition is not at all abnormal or improbable. 



In the mesothorax the precoxale has become split trans- 

 versely into two sclerites (Fig. 8, PC2). For the sclerite nearest 

 the sternum, I suggest the term sternocoxale (Fig. 8, stc) and 

 for the sclerite nearest the pleuron, the term pleurocoxale 

 (Fig. 8, pic). In the metathorax a portion of the precoxale 

 may have fused with the episternum, sternum and trochantin 

 (Fig. 8, pCs). How much has fused with each, it is impossible 

 to say. Another view is that the pleurocoxale has fused with 

 the episternum; the sternocoxale with the sternum and the 

 triangular sclerite (Fig. 8, tna) represents the entire trochantin. 

 In the thorax of Forficula there is no complete connection 

 between the episternum and sternum. 



There is a small sclerite between the pleural region and 

 sternum in the mesothorax of Gryllus, which is homologous 

 with the sternocoxale (Fig. 7, stc). Voss termed it the 

 " coxosternite. " 



In Locusta, Capnia, Corydalis, and many Lepidoptera, 

 Diptera, Coleoptera, etc., the precoxale is usually fused with 

 the • episternum and sternum, forming a continuous bridge 

 between them (Fig. 4, PC2). Secondarily formed sutures often 

 appear in this bridge or precoxale, as in Capnia, Corydalis, etc. 



The precoxale shows an interesting transition in the 

 prothorax of sawflies. In Abia and also Cimbex, the episternum 

 and sternum are connected by the precoxale (Fig. 15, pc). The 



