19G 



HYMENOPTERA. 



The genvis Bhyssa contains our largest species, and frequents 

 the holes of boring insects in the trunks of trees, inserting its 



remai'kubl}' long ovipositor 

 in the body of the larvae 

 deeply embedded in the 

 trunk of the tree. Harris 

 states that Rhyssa (Pimpla) 

 atrata and lunator (Fig. 128, 

 male) of Fabricius, "may 

 frequentl}^ be seen thrusting 

 their slender borers, measur- 

 ing from three to four in- 

 ches in length, into the 

 trunks of trees inhabited 

 hy the grubs of the Tre- 

 mex, and by other wood- 

 ^'?- J"^"- eating insects ; and, like 



the feranle Tremex, they sometimes l)ecome fastened to the 

 trees, and die without lieing a])le to draw their borers out 

 again." The abdomen of the male is very slender. 



Pim2>la has the ovipositor half as long as the abdomen. P. 

 pedalis Cresson is a parasite on t'lisioeampn. 



The genus Trorpis leads to Ichneumon. The antennas are 

 sliortcr than the body ; the abdomen is slightly petiolate, fusi- 

 form, and the second subcostal cell 

 Is quadrangular. Tror/ns exesorius 

 ]>rull6 is tawny red, and is a para- 

 site of Papilio Asterias. 



The genus Iclineumon (Fig. 129) 

 is one of great extent, probably 

 containing over three hundred spe- 

 cies. The abdomen is long and 

 slender, lanceolate ovate, slightly 

 petiolate. The second subcostal cell 

 is five-sided, and the ovipositor is 

 either concealed or slightly exserted. Fig. j2s. 



Ichneumon suturalis Say is a very common form, and has been 

 reared in abundance from the larva of the Army-worm, Leu- 

 cania unipuncta. The bod}- is pale rust-red, with l)lack sutures 

 on the thorax. Another common species, also parasitic on the 



