6 BtiUetin of the Brooklyn Entomological Society Vol. XVI 



into a primary and a secondary pair. Species examined: 

 Sthenopis humuli and 5". thuli L. (Fig. 3). 



Gorgopis. 



In this genus the fusion of terga 9 and 10 with the chitinous 

 processes of tergum 9 has resulted in the formation of two large 

 lobate processes located on either side of the opening of the 

 Ductus Ejaculatorius and attached basally to tergum 9, leaving 

 sternum 10 as a small isolated sclerite in the conjunctiva caudad 

 to sternum 9. The probable function is as an intromittent organ. 

 Tergum 9 is enlarged into a dorsal hood surrounding the base of 

 the anus and bears a small pair of secondary chitinous processes 

 on its inner dorsal margin. The preservation of tergum 11 in 

 this genus has been previously discussed. It is figured as a hood- 

 like structure with well chitinized lateral margin dorsad to the 

 anus. Species examined : an undetermined species in the Cornell 

 University collection (Fig. 4). 



Pielus. 



This genus presents the extreme of specialization by fusion. 

 The Vinculum is large, heavily chitinized and completely isolated 

 from the remaining uninvaginated portion of sternum 8 but situ- 

 ated dorsad to it. Sternum 9 is heavily chitinized, firmly attached 

 to the Vinculum by conjuctiva and bears on its lateral margin a 

 small pair of Harps. Tergum 9 is enormously enlarged, heavily 

 chitinized and bears a primary and secondary pair of processes. 

 Sternum and tergum 10 are small and firmly articulated to tergum 

 9. Appendage III is lost through the approximation of sternum 

 10 and the primary processes of tergum 9. These latter probably 

 function as the intromittent organ. The opening of the Ductus 

 Ejaculatorius is just caudad to sternum 10 and dorsad to these 

 processes (Fig. 5). Species examined: Pielus labyrinthicus. 



Summary 



By careful comparison it has been found possible to homologize 

 the taxonomic terminology of Pierce and other systematists with 



