Mr. W. F. Kirby on new Hymenoptera. 141 



Fi(/s. 3-5. Elasmopus rapax. Second gnathopod, J , showing three 



stages of development of the hand. 

 Fig. 6. The same. Last porffiopod. 

 Fig. 7. The same. Last uropods. 

 Fig. 8. The same. Telson. 



Fig. 9. Clieirocratus Sundevalli (Lilljeborg). First gnathopod, $ . 

 Fig. 10. The same. Second gnathopod, $ . 

 Fig. 11. Cheirocratus assimilis (Lilljeborg). Second gnathopod, $. 



Plate XII. 



Figs. 1-3. Cheirocratus StmdevaUi (h\\\]e\)or^). Three stages of develop- 

 ment of hand of second gnathopod in male. 

 Fig. 4. MelpJiidippa maera, Norman. First gnathopod. 

 Fig. 5. The same. Second gnathopod. 

 Fig. 6. The same. Last pertcopod, the thigh (basos). 

 Fig. 7. The same. Last perosopod, terminal joints. 

 Fig. 8. Melita dentata (Kriiyer). First gnathopod. 

 Fig. 9. The same. Second gnathopod. 

 Fig. 10. The same. Last perfeopod, the thigh (basos). 

 Fig. 11. Giimmarus locusta (Linn.). The telson (one half). 

 Fig. 12. Gammarus 7narinus, Leach. The telson. 

 Fig. 13. Gammarus catnpylo2)s, Leach. The telson. 



XIV. — Descriptions of neui Species of Tenthredinidge, Cyni- 

 pida3, and Chalcididse in the Collection of the British 

 Museum. By W. F. Kirby, Assistant in the Zoological 

 Department, British Museum (Natural History). 



In the present paper I offer descriptions of six interesting 

 new species which have recently been received belonging to 

 families of Hymenoptera which I had previously arranged. 



Tentliredinidse. 



Selandriin^. 

 Sela7idria Umbata. 



Exp. al. 18 raillim. 



Female. — Head, antennae, and jaws black, rhinarium and 

 nasus pale yellow ; thorax pale yellow above, with very large 

 black spots on the frontal and lateral lobes, and with the 

 sutures round the scutellum and postscutellum marked with 

 blackish ; prothorax beneath pale yellow, with a large black 

 spot on each side, followed by a small one, the latter just 

 before the front coxge ; mesopectus and mesopleura shining 

 black ; metapectus pale yellow, witli a large black spot on 



