( civ ) 



broad collar with two very lung narrow arms of cliitin de 

 veloped into long brushes, and the aedoeagus is a long narrow 

 curved tube sharply dentate at the lower apical margin. 



The Geometridae are as varied as any family in the general 

 structure of their genitalia; if we take the oldest subfamilies, 

 according to Prout, we should consider first the Brejphinae 

 and the Oenochrominae. 



Brephos noiha, Hb., 



retains the cingula in a well-developed, though not highly 

 developed, form ; it is almost articulated at the upper edge of 

 the harpagones, from whence it widens and is of moderate 

 width ; the tegumen is articulated to it at the rear and is (at 

 the rear) two-armed for a short distance, when the arms unite 

 and become one solid dorsal process, widening outwards at 

 first and then tapering forwards to the apex ; the harpagones 

 are fairly broad for the basal two-thirds, when they taper 

 down rapidly in a slight curve on each side to bluntly pointed 

 apices ; the aedoeagus is moderately broad and straight, with 

 the vesica armed with a horseshoe-shaped series of powerful 

 cornuti. 



Brephos parthenias, L., 



has the cingula more robust than in notJia; the tegumen is 

 similarly branched at the base, but soon becomes united into 

 one strong highly curved horn-like uncal extremity, the anus 

 is below this ; the harpagones are two long narrow arms, 

 decidedly broader at the base but suddenly constricted, and 

 are furnished for their ventral half with a loose outer case of 

 very long hairs arising from the harpago near the constricted 

 area, this half case fits more or less closely all along the narrow 

 portion; the aedoeagus is fairly long, narrower for the apical 

 half, the vesica being furnished with cornuti, somewhat 

 similar in shape to that in notha, but much finer. 



Three examples of the Oenochrominae must suffice, in which 

 we shall find indications of atavic characters differing, of 

 course, in degree. 



Alsophila aescularia, Schiff., 



retains the primitive cingula wherein the sternite and tergite 

 sections are plainly visible ; the articulation of the tegumen 



