30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



bears a longitudinal ridge (ppr), and a rounded posterior lobe next 

 to it on each side (ppl). The ental side of the posterior notal wing 

 processes (pnp) of the scutum bears a small transverse phragma of 

 unknown homology. 



The endotergites of the metathorax are much more extensive than 

 those of the mesothorax. The most conspicuous are the two V-ridges 

 (figs. 4 F, 5 A, vr) converging anteriorly near the center of the seg- 

 ment. These mark the lateral boundaries of the scutellum but are not 

 marked on the ectal surface by definite sutures. Posteriorly each 

 V-ridge seems to coalesce with a transverse apodeme, the posterior no- 

 tal ridge (ponr), which is formed from the posterior edge of the scu- 

 tum and scutellum and extends from the base of one wing to the base 

 of the other. Just laterad of the anterior end of the V-ridge is a short 

 transverse apodeme called the transverse notal ridge {tnr). The cen- 

 tral part of the anterior edge of the prescutum bears a lobate phragma, 

 the prephragma (prph), which is more or less connected laterally to 

 the large muscle disk (mdtt). The prescutoscutal suture (psss) 

 marks the invagination of the anterior notal ridge (annr), which ex- 

 tends around to the base of the wings, where it approaches a small 

 apodeme supporting the axillary process (axp). The posterior part 

 of the postnotum (pn) bears a transverse suture (acs) marking a 

 long apodeme, the postphragma (pph), which supports the postnotal 

 articulations (pna) and is expanded into a pair of lobes which project 

 over the posterior ends of the V-ridges and appear to be more or less 

 connected with the posterior notal ridge (ponr). 



The endopleurites are present in all three of the thoracic seg- 

 ments. Since the pleuron of the prothorax is greatly reduced and 

 united with the trochantin, it is this combined sclerite that bears the 

 pleural apophysis. This is a large crescentic process which projects 

 under the inflexed hypomera. There is an oval sclerotization on the 

 ental surface of the peritreme, but this is a structure of the endo- 

 pleuron of the mesothorax. 



The endopleurites of the mesothorax are very small. The pleural 

 apophysis (fig. 5 B, pla) is formed between the episternum and the 

 epimeron and projects into the coxal cavity to form the pleural coxal 

 process (cxp). An apodeme also extends from the pleural apophysis 

 along the posterior edge of the episternum or pleuron to the region of 

 the muscle disk of the endotergites and to the base of the elytra. 



The endopleurites of the metathorax are relatively much more de- 

 veloped than those of the mesothorax. The pleural apophysis (fig. 5 A, 

 pla) is composed of a pleural ridge (plr) formed between the epi- 

 sternum and the epimeron along the pleural suture, and an ental ex- 



