122 Mr. W. F. KIrby on Two new 



tubes. They occur either at the tips of such branches where 

 the eggs ordinarily develop, or as slight lateral bulgings of 

 the same." T have recently had occasion in the course of my 

 work to examine a series of longitudinal sections through 

 Apus cancriformisj and I have failed to identify any such 

 " sperm-producing centres." 



On p. 144 he gives a figure representing a portion of the 

 ovary, and at one point the epithelium of the duct is inter- 

 rupted by a group of small round granules, which is labelled 

 "testis, as occasionally found (e. g. in Apus cancriforniis)^ 

 This " testis " is neither a terminal nor a lateral bulging ; 

 this figure, too, which is the only illustration of the point in 

 question, is so crude that we ought to have further details of 

 these '' sperm-producing centres." 



I will not presume to deny the possibility of hermaphro- 

 ditism in the i^podidse, however improbable it may be; I 

 merely repeat, we wait for further evidence. 



With regard to Bernard's figure of the ovary I would say one 

 more word. Von Siebold, in a paper accompanied by beautiful 

 figures, showed that each terminal swelling of the ovary is 

 formed of four cells, of which the distal cell becomes the egg- 

 cell, the other three being yolk-forming cells. That this is 

 true for Apus a glance at a section is suflScient to demon- 

 strate ; but Bernard, in the figure referred to (illustrating 

 presumably Lepidurus), represents the proximal cell of the 

 four as the egg-cell. If this is really the case, we have an 

 extremely interesting difference between the two genera. 



Oxford. 

 December 16, 1895. 



XVI. — Descriptions of Two new Species o/Eugaster (Hetro- 

 didae) from East Africa. By W. F. KiRBY, F.L.S., F.E.S., 

 &c., Assistant in Zoological Department, British Museum. 



Eugaster suakimensis. 



Long. corp. 37-40 millim. 



Head brown, strongly punctured above, the lower mouth- 

 parts, the palpi, and the base of the antennae more or less 

 varied with testaceous ; a short conical testaceous spine 

 between the antennae ; pronotum reddish brown or blackish, 

 varied with testaceous in front and along the median line, and 

 with reddish behind. It is strongly rugose, with two irre- 



