AND ANATOMY OF CERTAIN HYMENOPTERA PARASITICA. 



415 



EXPLANATION OF THE PLATES. 



Lettebing. 



L. 



M. 



MP.Si 



MT.3. 



MU. 



NC. 



NY. 



O. 



OC. 



P. 



PT.2. 



P. 



S. 



1st S., 

 SA. 



SG. 

 SH. 

 SP. 

 ST. 

 STIL.' 

 Tx. 



T.R. 

 T.V. 



V. 



W & 



Carcase of the caterpillar of 



Porthesia similis after exit of 



the parasites. 

 Mouth. 

 MN. Mesenteron of hyperparasite. 

 Metathorax. 

 Muscle. 

 Nerve-cord. 



Last segment of nerve-cord. 

 Opening of vesicle gland. 

 Outer chitinous layer or cuticle. 

 Parasite inside host. 

 Prothorax. 

 Rectal region. 

 Outer embryonic membrane 



(serosa ?) 

 1th S. First and seventh stigmata. 

 Pseudo - amnion or embryonic 



membrane. 

 Silk (salivary) gland. 

 Sheath of ovipositor. 

 Space between edges of cells. 

 Stomach. 



Stylets of ovipositor. 

 Enigmatic tubular gland (Mal- 



pigbian tube?). 

 Tracheal tube. 

 Terminal vesicle. 

 Ventral. 

 W-. Imaginal discs of wings. 



Plate 24. 



Fig. 1. Microgaster connexus cocoon after emergence ot imago. The latter has made its 

 exit by cutting a beautiful lid (X). Compare fig. 9. x 8. 



Fig. 2. Mici-ogaster connexus (Nees), adult male. X 8. 



Fig. 3. Outlines of larvse of M. connexus drawn at different ages, a — h, at same scale as 

 previous figures. 



Fig. 4. Adult Porthesia similis larva, with hyperparasitic Mesochorus pallidus (Brisch.) at 

 HP. drawn to same scale as caterpillar, x 1. 



Fig. 5. Parasitized caterpillar's skin after emergence of parasitic M. connexus. The latter 

 larvae have spun their cocoons at C x 1. 



Fig. 6. Somewhat diagrammatic drawing of the complete anatomy of the three-quarter 

 grown larva of M. conne.xus. Hyperparasite at HP. The tracheal system 

 rather schematic, everything else except heart drawn to scale. The secondary 

 branches of the tracheal system were not put in, so as to leave the drawing 

 clearer. The heart in the hind region should be wider, but it has not been put 

 in so, in order to show the gut better, x 45, 



