82 BRITISH TYROGLYPHID^E. 



the accessory glands of the male are stored with secre- 

 tion, the reproductive organs become some of the 

 largest, if not the largest, in the body : indeed they 

 seem often to force almost all the other organs out of 

 position, and even produce considerable distension of 

 the external cuticle. 



THE MALE REPRODUCTIVE ORGANS. PL B, figs. 1 7;', 

 PL C, fig. 5. 



These consist of the testes, two in number in all 

 species whose anatomy is known ;* the vasa deferentia ;. 

 the ductus ejaculatorius ; the accessory glands ; and the 

 penis with its surrounding sclerites and its and their 

 muscles ; and finally the genital suckers (so called), and 

 the copulative suckers; they all usually lie in the 

 hinder part of the abdomen. 



The Testes. In Glj/cyphagus platygaster, and in all 

 other Tyroglyphida3 the anatomy of which is known, 

 the testes consist, as above stated, of two paired 

 organs; in G. platygaster they are pyriform, the 

 broader end being the posterior ; they lie far back in 

 the body (PL B, figs. 1, 2, t) ; they are, as before 

 stated, at first plasmodic masses with very numerous 

 scattered nuclei, round each of which the plasma 

 gradually collects and forms a cell; the formation 

 being of course by individual nuclei at different times, 

 not all at once. Nalepa figures the testes of Tyroglyphw 

 longior similar in form, but one of them placed rather 

 further forward in the body, involving a shortening of 

 its vas def erens ; he says that they are globular or oval, 

 but later on become irregular in form ; the testes of 

 Sericia Robini I also found to be of the same shape, 



* Haller describes and figures four in Aleurobiusfarinx, and six in 

 Glycyphagus sciurinus, but it is extremely doubtful whether this is 

 reliable ; he apparently did not dissect or cut sections, and probably 

 mistook the accessory glands for a second pair of testes, and possibly 

 even the caeca of the ventriculus for a third. Pagenstecher, treating 

 of the same species, which he in error calls T. siro, only -gives two; 

 his 'paper, however, is very slight and cannot be considered an 

 authority. 



