202 R. E. SNODGRASS. 



There are two apical appendages on each side (fig. 58). The 

 upper is a simple fliat lobe tapering distally (A). The lower (B) 

 lobe is wide and flat ending above in a narrow neck like process. 

 Covering the outer anterior edge of* the main lobe is a partially de- 

 tached plate ending above in a free point. On the posterior distal 

 angle is a high thin crest-like lobe, and on the outer side of the base 

 a small elongate lobe (C). 



The penis extends forward to the anterior part of the sixth seg- 

 ment, making an ordinary wide bend. The central vesicle (fig, 57, 

 c. V.) faces anteriorly, i. e., the surface usually directed downward is 

 turned forward. The penis, hence, first goes dorsally and posteriorly 

 making a wide loop by curving downward to the ventral part of the 

 abdomen in the sixth segment, and then going posteriorly to the 

 guard of the penis on the floor of the genital chamber. The latter 

 (fig. 57, J), g.) consists of a straight tapering rod grooved above. A 

 thick tapering process projects posteriorly from its base ; from each 

 side of the base there arises a slender sickle shaped process. 



Pachyrrliina ferruginea Fab. {PI. XI, figs. 55. 56). 



The hypopygium is very simple in its structure. The tergum is 

 deeply notched in the median line on the posterior border. The 

 sternum is also deeply notched mesially. The pleura are separated 

 from the sternum on each side by a suture running forward three- 

 fourths the length of the hypopygium and then ending in an up- 

 ward bend. 



Of the two apical appendages the upper is thin, wide basally and 

 tapering distally, and is curved inward. The lower one is wider and 

 shorter and ends in a point directed upward and forward. On its 

 outer anterior edge is an elevated ridge ending above in a free point. 



The penis extends forward to the anterior end of the fourth seg- 

 ment. The guard of the penis is simply a trough-shaped structure 

 projecting backward from its origin on the floor of the genital cham- 

 ber just in front of the notch of the sternum. The base of the guard 

 is expanded laterally, and from each expansion there projects poste- 

 riorly a long bifid appendage (fig. 55.) The lower arm on each side 

 is the larger. It is tapering, convex outwardly along the basal half, 

 inwardly along the distal half, and terminates in a small knob. 

 The dorsal arm is shorter, slenderer and more tapering than the 

 lower. From the common base of each pair a long arrn-like pro- 



