1974] 
Cooper — Boreus 
91 
Fig. 1. Mating of Boreus notoperates. A, mated pair preserved in female 
perpendicular position; the medial tooth of the gonostylus has disengaged 
(at death) from the lateral basal notch of the gonapophysis. B, full union 
of male and female; medial tooth of gonostylus seated into the lateral basal 
notch of the gonapophysis ; C, semi diagrammatic representation of mated 
specimens cleared in clove oil ; as in A, the gonapophysis is partially with- 
drawn from the endandrium, and the lateral basal notch of the gonapophysis 
(at arrow) is clearly visible; dorsal proctigeral plate (closely, transversely 
lined) lies within epandrial notch; gonapophyses stippled; aedeagus (widely, 
transversely lined) partially inserted in common oviduct — note flap at 
anterior margin of female gonopore and paired ejaculatory ducts entering 
base of aedeagus; the sclerotized lamina that forms floor of endandrium is 
cross-hatched (see text). D, male terminalia with everted aedeagus, apical 
nipple of which bears the gonopore; upper left — inner face of right gono- 
style to show median tooth and stylocavernula. All from camera lucida 
sketches; scale: for A and B equals 1 mm, for C and D equals 0.5 mm. 
