Megarhyssa, OCCURRING IN

Khalaim, A. I., Ruíz-Cancino, E. & Coronado-Blanco, J. M., 2021, Darwin wasps (Hymenoptera: Ichneumonidae) of Mexico: subfamily Rhyssinae, Russian Entomological Journal 30 (3), pp. 305-313 : 311

KEY TO SPECIES OF MEGARHYSSA OCCURRING IN MEXICO

1. Metasoma laterally yellow, with broad dorsal longitudinal black stripe extending along entire length of metasoma. Fore wing hyaline with conspicuous subapical dark mark at apex of radial cell. Flagellum of antenna blackish with broad subapical pale band. Ovipositor sheath 3.4 times as long as fore wing .............................................. ...................... 1. M. gratiosa Khalaim et Ruíz-Cancino

— Metasoma with variable amount of yellow, reddish orange and black; tergites often transversely banded or with dorsal and/or lateral marks, but never with continuous median black stripe extending along entire length of metasoma. Fore wing without apical dark mark, or with radial cell darkened only at base. Flagellum of antenna more or less entirely black, sometimes somewhat lighter in the apical half, never with contrasting pale band. Ovipositor sheath about 1.9–3.0 times as long as fore wing .............................................................................. 2

2. Hind leg with coxa and tarsus entirely black, femur and tibia black in basal 0.8 and yellow in apical 0.2. Head and mesosoma black with yellow markings. Metasoma extensively black, tergites 1 and 2 with pre-apical dorsomedian yellow marks, tergite 3 and following tergites with lateral yellow markings. Malar space 1.4 times as long as apical mandibular width. Ovipositor sheath almost twice as long as fore wing ............................... 3. M. verae Kasparyan

— Hind leg predominantly brownish orange with yellow marks. Head and mesosoma predominantly yellow and brown. Metasoma yellow to reddish brown, with more or less distinct transverse pre-apical yellow bands on tergites. Malar space 0.7 times as long as apical mandibular width. Ovipositor sheath 3.0 times as long as fore wing ............................ 2. M. macrurus macrurus (Linnaeus)