24 



PROCEEDINGS OF THE ACADEMY OF 



[Jan., 



(ES' + L) consists of a single piece which may be designated by 

 Heymon's, '99, term subcoxa. 7 However, it should not be taken for 

 granted that in adopting Heymon's terminology, his theory of the origin 

 of the subcoxa is likewise accepted ; for, as will be later discussed, it is 

 very improbable that the subcoxa is the basal portion of the leg. 



EM 



Fig. 9. Fig. 10. Fig. 11. 



Fig. 9. — Dolerus. — External view of the right cervico-pleuron (i.e., union of 



the cervicals with the prothoracic pleuron). This region is usually termed 



the prothoracic episternum. 

 Fig. 10 represents the anterior portion of fig. 9, seen from within to show the 



apodeme-like structure (CSad) separating the anterior lateral cervical (C»S 2 a) 



from the posterior lateral cervical (CS 2 p). 

 Fig. 11 represents the posterior portion of fig. 9 seen from within; showing the 



apodeme {AD') between the prothoracic episternum (ES') and epimeron (EM'). 



The trochantin (T) is represented as a portion of the subcoxa, though 

 it is quite possible that it was originally a portion of the coxa, separated 

 off by muscular tension, and united with the subcoxa as a secondary 

 modification. For the present, however, this point may be left out 

 of consideration. 



The first division of the subcoxa doubtless occurred along the line 

 a c (fig. 20), thus separating the subcoxa into the episternum (ES) 

 and a region which may be termed the laterale (L). The further divi- 

 sions in the laterale may occur in either of two directions — longitu- 

 dinally or transversely. A longitudinal division (i.e., along the line 

 c i g) would produce the condition found in the cockroach (fig. 21, 

 compare also pi. Ill): that is, there would be a separation into an 

 anterior region, which may be termed the anterior laterale 8 (L a ), and 

 a posterior one, which may be termed the antecoxal laterale (L b ). 

 The latter term is a slight modification of Walton's, '00, "antecoxal 

 piece," which has priority over Verhoeff's, '03, " katopleure. " If, on 

 the other hand, the laterale be divided, not longitudinally (as in the 



'According to Enderlein, the "subcoxa" represents the trochantin; Borner 

 considers it the equivalent of his merosternum; and Verhoeff homologizes it 

 with his coxopleure and trochantin. 



8 In a former publication this sclerite was termed the "pleuro-laterale." 



