110 GNATS OR MOSQUITOES — CHAPTER VI 



mesh. Presumably not only the spermatic elements, but 

 detached portions of the fibrous basis of the testicle are 

 carried down the vas deferens and stored in the receptacula, 

 but the manner in which this is effected is difficult to 

 understand. The ejacuiatory duct is short, simple and 

 straight, and ends in a short, fleshy penis, which is unpro- 

 vided with any chitinous armature. 



Fig. 28. — Male Genebative Organs of C. fatigans. 



A, The male organs, the vasa defercntia being represented as curved to 

 save space (they actually pursue a perfectly straight course) x 18 diams. ; 

 t, testicles; vd, vasa deferentia ; r s, receptacuke scminalcs ; ed, ejacuiatory 

 duct ; c, claspers or external gonapophyses ; i g, internal gonapophyses ; p, 

 penis ; B, contents of receptacula scminalcs, x 450 diams. 



All these points can be made out, if not at the first attempt, 

 at least after examining a few carefully made, teazed prepara- 

 tions, and the reader is strongly recommended to follow 

 the preceding descriptions with such preparations before 

 him rather than to trust to illustrations, which, owing to 

 the extreme delicacy of the objects which it is attempted to 

 represent, are at best mere diagrammatic representations, 

 and can do no more than serve as a guide to the recognition 

 of the parts sought for. 



Apart from the fact that the ova dififer markedly from 



