No. 1774. THORAX OF HYMEN0PTERA—SN0DGRA88. 89 



14, discoidal. 



15, subdiscoidal. 



16, first recurrent. 



17, second recurrent. 



18, transverse vein in anal cell. 



19, stigma. 



20, submarginal. 



21, marginal. 



22, postmarginal. 



23, stigmal. 



24, intercostal. 



Plate 1. 



Fig. 1. Tremex columba (Siricidse), thorax and base of abdomen. 



2. Tremex columba, propectus, ventral, left coxa removed. 



3. Tremex columba, mesotergum, dorsal. 



4. Tremex columba, mesotergum, ventral. 



5. Tremex columba, lateral and ventral parts of mesothorax, from above, tergum 



removed. 



6. Tremex columba, terga of metathorax and first abdominal segment, dorsal. 



7. Tremex columba, lateral and ventral parts of metathorax, from above, tergum 



removed . 



8. Tremex columba, left metapleurum, hind coxa, and attached part of first 



abdominal tergum, internal. 



9. Tremex columba, left mesopleurum and middle coxa, internal 



Plate 2. 



Fig. 10. Arge, sp. (Tenthredinidse), mesothorax, left side. 



11. Arge, sp., metathorax and first abdominal tergum (propodeum), left side. 



12. Arge, sp., propleurum, sternum, and front leg, left side. 



13. Dolerus aprilis (Tenthredinidse), propleurum and base of first leg, left side. 



14. Arge, sp., mesopectus, ventral. 



15. Arge, sp., metapectus, ventral. 



16. Trichiosoma lanuginosa (Tenthredinidse), mesothorax, left side. 



Plate 3. 



Fig. 17. Bactroceros pallimacula (Pamphilidse), thorax and base of abdomen. 



18. Lijgsenematus erichsonii (Tenthredinidse), thorax and base of abdomen. 



19. Trichiosoma Zawugrmosa (Tenthredinidse), thorax and base of abdomen. (See 



also fig. 16, pi. 2.) 



Plate 4. 



Fig. 20. Euurobracon penetrator (Braconidse), thorax and base of abdomen. 



21. Capitonius ashmeadii (Capitoniidse), thorax and base of abdomen. 



22. Odontaulacus editus (Evaniidse), thorax and base of abdomen. 



Plate 5. 



Fig. 23. Erymotylus macrurus (Ichneumonidse), thorax and base of abdomen. (See 

 also fig. 33, pi. 7.) 



24. Metopius pollinctorius (Ichneumonidse), thorax and base of abdomen. 



25. Megarhyssa lunator (Ichneumonidse), thorax and base of abdomen. 



