14 G. C. Crampton and W. H. Hasey, 



aes is merely the upper portion of the episternum, while the lower 

 portion of the episternum has united with the trochantin and the 

 narrow marginal region called the antecoxale (ac of Figs. 1 and 2) 

 to form the composite region pfn of Fig. 8. 



LowNE, 1890 — 1892, likewise homologizes a portion of the 

 episternum (which he designates as the "epitrochlea") with the 

 trochantin, in the prothorax of the blowfly. He is mistaken, however, 

 in his statement that this "epitrochlea is certainly the trochantin 

 of AuDOuiN and the rotula of Steaus Durckheim", for his "epitrochlea" 

 corresponds in part to the prothoracic episternum. 



CoMSTOCK & KocHi, 1902, consider that the posterior region of 

 the trochantin designated as pt, in Fig. 2 (of the present paper) 

 represents the entire trochantin in the meso- and metathorax of the 

 roach, and that the anterior region of the trochantin, at, represents 

 the "antecoxal piece". The designation „antecoxal piece", however, 

 is always applied by other writers, to the sclerite ac (Fig. 2, and 1) 

 in the roach, as is done by Walton, 1900, although this sclerite 

 is not strictly homologous with the so-called "antecoxal piece" 

 of the Coleoptera, which is a sternal subdivision. The true ante- 

 coxal piece, or antecoxale, ac, of the roach (Fig. 2) is termed the 

 "second antecoxal piece" by Comstock & Kochi. The terms "ante- 

 coxal piece" and "second antecoxal piece", would imply that the two 

 sclerites were either parts of the same plate, or at least had points 

 in common, but the sclerites ac and at (Fig. 2) have nothing- whatsoever 

 in common, since at is the anterior portion of the trochantin tn 

 (compare with Fig. 3), while ac is the posterior marginal region of 

 the pre-coxal bridge connecting the episternum with the sternum. 

 It is therefore preferable, if confusion is to be avoided, to restrict 

 the designation „antecoxal piece" (or antecoxale) to the sclerite ac 

 (Figs. 1 and 2) as is done by other writers and to term the anterior 

 region of the trochantin, at, the anterior trochantin, or antetrochantin 

 (instead of designating it as the "antecoxal piece") while the 

 posterior region of the trochantin pt, instead of being designated 

 as the entire trochantin, should be termed the posterior trochantin, 

 or the postrochantin. 



In his fig. 120 of the prothorax of the roach Blahera (which he 

 uses to illustrate the sclerites of the Blattidae) Shaep, 1895, 

 designates the true epimeron {em of Fig. 1, of the present paper) 

 as a "fold of the pronotum", while the basal portion of the entire 

 trochantin (i. e. U, of Fig. 1), he thinks is the "epimeron", and the 



