NEW MAI.I.Ol'HAQA. lOi' 



Oncophorus bisetosus calif ornicus. 



There is iiotlimg in the genitalia of tliis form differ- 

 ent from those already described. The ehitinous parts 

 consist of a rather wide internal plate with thickened 

 margins and transparent central part, and of an outer 

 median tapering chitinous intromittent organ with 

 articulated lateral processes. Piaget figures Oncu- 

 pkuriifi liny iL it'll I atus in which the genitalia are ai»j»ar- 

 ently the same as in the t'orm just described. 



Goniocotes creber. (Plate Xl\', lig. '•). 



In this form the chitinous genitalia are extremely 

 reduced. Within the body is a long narrow i)late 

 reaching almost to the anterior end of the abdomen. 

 It is very thin and transparent except laterally, where it 

 is weakly chitinized, giving the appearance of two long, 

 very delicate, slightly curved rods lying within the body. 

 Each of these is continuous externally in the wall of 

 the penis. Their outer parts are more chitinized, the 

 tips sharp and convergent. Muscles are attached to 

 the internal part. I'iaget figures several species of 

 Goniocoteft in whieli the chitinous genital parts are 

 about the same as in G. creber, consisting of an internal 

 plate with external prongs. In some the plate is evi- 

 dently more chitinized than in this form. 



The species whose genitalia have been described are 

 all Ischnoceran forms; the following l)elong to the 

 Aniblycera and it will be seen that the genitalia are 

 more sim})le than in the others, though essentially the 

 same. 



Trinotou luridum. (Plate XI \'. tig. 7). 



A genital chamber is present with a membranous 

 penis arising from its inner end. The chitinous parts 

 consist of a long, slender, tapering rod running forward 



