Megarhyssa macrurus ( Linnaeus, 1771 )

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

2. Megarhyssa macrurus ( Linnaeus, 1771)

Ichneumon macrurus Linnaeus, 1771: 540 [lectotype female (LS), USA, South Carolina, near Charleston ].

= Ichneumon georgicus Megerle, 1802 [ Townes, Townes,1960].

= Megarhyssa lunator phaeoptila Michener, 1939 [ Townes, Townes, 1960].

= Thalessa? histrio Kriechbaumer, 1890 (name preoccupied by Ichneumon histrio Christ, 1791 ).

REFERENCES. Rohwer, 1920: 428 [ Thalessa? histrio ; remarks]; Townes, Townes, 1960: 429 [description; review, key to 3 subspecies; biology], 434 [ Ichneumon georgicus (syn.), M. lunator phaeoptila (syn.)]; Townes, 1961: 108 [notes on type]; Stillwell, 1967: 688 [host; Canada (New Brunswick)]; Fitton, 1978: 369 [lectotype female (LS) designated; USA, South Carolina, near Charleston]; Carlson, 1979: 354 [catalogue; 2 subspecies in America north of Mexico]; Ruíz-Cancino et al., 2002: 646 [checklist; Mexico]; Pook et al., 2016: 143 [diagnosis, photographs].

There are three Nearctic subspecies that differ from each other mostly by their colour pattern [ Townes, Townes, 1960; Pook et al., 2016]. One subspecies occurs in the northern parts of Mexico.

BIOLOGY. Parasitoid of horntail sawfly Tremex columba (L.) ( Hymenoptera : Siricidae ) [ Townes, Townes, 1960; Stillwell, 1967].

DISTRIBUTION. Canada, USA, Mexico (Chihuahua, Nuevo León).