American Entomological Institute

couplet #1

History
Key to genera of Nearctic Acaenitinae (modified from Townes, 1960) (at the start)

Notes: Useful links for key: general ichneumonid morphology

1. Fore and middle tarsal claws simple. Supra-antennal area without strong median longitudinal carina. Areolet of fore wing present except in Coleocentrus flavipes. Apex of ovipositor with prominent teeth on ventral valves . Hind tarsus of females with tarsomere 5 0.5-1.1x as long as tarsomere2 (usually 0.5-0.7x as long).

1. Coleocentrus pettiti

2. Coleocentrus pettiti

3. Coleocentrus occidentalis

4. Coleocentrus occidentalis

5. Coleocentrus pettiti

future couplets

2. Clypeus with median subapical to... ... Coleocentrus

2’. Clypeus without median subapica... ... Mesoclistus

1’. Fore and middle tarsal claws with acute accessory tooth near apex. Supra-antennal area with strong medial longitudinal carina. Areolet of fore wing absent. Apex of ovipositor without teeth on ventral valves, or with teeth weak. Hind tarsus of females with tarsomere 5 1.3-1.9x as long as tarsomere 2.

1. Arotes decorus

2. Spilopteron occiputale

3. Yezoceryx rupinsulensis

4. Spilopteron franclemonti

5. Arotes decorus

future couplets

3. Ventral swelling of S1 without s... ... Yezoceryx

3’. Ventral swelling of S1 with num...

4. Hind tarsal claws with small acc... ... Arotes

4’. Hind tarsal claws without acces... ... Spilopteron



Home Loans Identification Service Publications Founders Visiting the AEI Type Specimens Genera Ichneumonorum Nearcticae	couplet #1 History Key to genera of Nearctic Acaenitinae (modified from Townes, 1960) (at the start) Notes: Useful links for key: general ichneumonid morphology go 1. Fore and middle tarsal claws simple. Supra-antennal area without strong median longitudinal carina. Areolet of fore wing present except in Coleocentrus flavipes. Apex of ovipositor with prominent teeth on ventral valves . Hind tarsus of females with tarsomere 5 0.5-1.1x as long as tarsomere2 (usually 0.5-0.7x as long). 1. Coleocentrus pettiti 2. Coleocentrus pettiti 3. Coleocentrus occidentalis 4. Coleocentrus occidentalis 5. Coleocentrus pettiti future couplets 2. Clypeus with median subapical to... ... Coleocentrus 2’. Clypeus without median subapica... ... Mesoclistus go go 1’. Fore and middle tarsal claws with acute accessory tooth near apex. Supra-antennal area with strong medial longitudinal carina. Areolet of fore wing absent. Apex of ovipositor without teeth on ventral valves, or with teeth weak. Hind tarsus of females with tarsomere 5 1.3-1.9x as long as tarsomere 2. 1. Arotes decorus 2. Spilopteron occiputale 3. Yezoceryx rupinsulensis 4. Spilopteron franclemonti 5. Arotes decorus future couplets 3. Ventral swelling of S1 without s... ... Yezoceryx 3’. Ventral swelling of S1 with num... 4. Hind tarsal claws with small acc... ... Arotes 4’. Hind tarsal claws without acces... ... Spilopteron go