Journal 



OF THK 



NEW-YORK MICROSCOPICAL SOCIETY. 



Vol. VI. OCTOBER, 1890. No. 4. 



THE OVIPOSITOR OF CRYPTUS SAML-E PACK. 



BY LUDWIG RIEDERER. 

 {Read Febnia)y -jtli, 1890.) 



The members of this genus of hymenopterous parasites are 

 conspicuous on account of the length of the exserted ovipositor. 

 This latter is composed of the ovipositor proper, and the two 

 enclosing sheaths. These originate from the end of the abdo- 

 men, while the ovipositor proper protrudes from the ventral 

 line of the abdomen, behind the sixth ring. The oviduct 

 reaches this place in a forward direction, and there connects 

 with the ovipositor, where it makes a bend downward and 

 backward. As a consequence the thence straightening tube 

 reaches far behind the body of the insect. Several bundles of 

 muscles run from the point of exit of the ovipositor, in both an 

 upward and backward direction, the latter bundles extending 

 towards the anal end of the abdomen. The ovipositor proper 

 is formed by one dorsal and two ventral parts, and they are 

 fastened together in such manner that they can slide up and 

 down upon each other, as far as the corresponding muscles in 

 the abdomen will allow, but the parts cannot be separated 

 sidewise. 



Description of Plate 35. 



T., It.— Dorsal parts, X 350. 



III., IV.— Ventral parts, X 350. The combination of the tubes gives the greatest 

 strength for the least material employed. The substance of the tubes is 

 thieke8t on the sides of the surface, and near the tongues and grooves, and it 

 is thinnest and most tlexible on the sides which form the vertical slit. The 

 soft substance and trachea' are seen in the tube. 



v., VI.— Appendices to ventral parts, connected by elastic joints, X 800. Figs. I.-VI. 

 are drawn with the camera. 



VII., VIII.— Diagrams to show the ovipositor while closed, and also while extended by 

 the passing of the egg. Jo, Joint of dorsal part. SI, Slit, forming passage 

 for the egg. Tr, Trachea:- enclosed with soft substance in the tubes. To, 

 Tongues, gr. Grooves. Ap, Appendices on the ventral parts. E, Egg. 



