J. H. MERRILL 153 



EXPLANATION OF PLATES 



Plate XII 



Fig. 1. — Antenna of Megarhyssa lunator. 

 Fig. 2. — Maxilla of Megarhyssa lunalor. 



C — cardo. Gr— galea. L — lacinia. P — palpus. S — stipes. 

 Fig. 3. — Head of Megarhyssa lunator. 



CE — compound e3'e. CL — clypeus. GE — gena. L — labrum. MD — 

 mandible. 

 Fig. 4. — Mandible of Megarhyssa lunator. 

 Fig. 5. — Dorsal view of thorax of Megarhyssa lunator. 

 Fig. 6. — Lateral view of thorax of Megarhyssa lunator. 

 a2 — second abdominal segment, cxl — procoxa. cx2 — mesocoxa. cx.3 — 

 metacoxa. epm2 — mesoepimeron. epmS — metaepimeron. epsl — proepi- 

 sternum. eps2 — mesoepisternum. eps3 — metaepisternum. nl — pronotum. 

 ppct2 — prepectus. psc2 — prescutum. sp — spiracle. scl2 — mesoscutellum. 

 sclS — metascutellum. sct2 — mesoscutum. sct3 — metascutum. tg — tegula. 

 tsp — thoracic spiracle. 



Plate XIII 



Fig. 1. — Abdomen of Megarhyssa lunator. 



Fig. 2. — Sternal plate of abdomen of Megarhyssa. 



Fig. 3. — Sternal plate of abdomen of Rhyssa. 



Fig. 4. — Second abdominal segment of Rhyssa. 



Fig. 5. — Second abdominal segment of Megarhyssa. 



Fig. 6. — Hind leg of Megarhyssa hmator. 



Fig. 7. — Fore leg of Megarhyssa lunator. 



Plate XIV 



Fig. 1. — Fore wing of Megarhyssa lunator according to Snodgrass. 



1 — costal vein. 2 — sub-costal vein. 3 — radial vein. 4 — median or ex- 

 terno-median vein. 5 — anal, sub-median or interno-median vein. 7 — basal 

 vein. 9 — cubital vein. 11 — transverse cubital vein. 12 — transverse cubital 

 vein. 13 — transverse medial vein. 14 — discoidal vein. 15 — subdiscoidal 

 vein. 16 — first recurrent vein. 17 — second recurrent vein. 19 — stigma. 



Fig. 2 — Fore wing of Megarhyssa lunator according to Cresson. 



a — costal and sub-costal nervures blended, b — externo-mcd'al nervure. 

 c — anal nerviire. d — basal nervure. e — marginal or radial nervure. f— 

 first transverse cubital nervure. g — second transverse cubital nervure. 

 h — transverse medial nervure. i — abbreviated cubital or stump of ner\-ure. 

 j — discoidal nervure. k — cubital nervure. 1 — recurrent nervure. m — sub- 

 discoidal nervure. n — stigma. 



TRANS. AM. EXT. SOC, XLI. 



