Aphanistes crepuscularis, Hopperand, 1981

Alvarado, M., 2018, Nocturnal Aphanistes (Hymenoptera: Ichneumonidae: Anomaloninae) in the Neotropical region, with the description of five new species, Zootaxa 4369 (2), pp. 221-236 : 235

Key to the species of the crepuscularis species group

1 Mesopleuron with epicnemial carina sometimes absent laterally, usually extending above level of lower corner of pronotum (Figs. 5, 7, 25); ovipositor with a dorsal notch, and pre-apically more or less cylindrical with diameter less than that of ovipos- itor medially (Figs. 4, 11, 27)............................................................................ 2

- Mesopleuron with epicnemial carina present, extending to about 0.5× distance to upper margin (Figs. 13, 22); ovipositor with- out a notch and pre-apically markedly swollen (Figs. 15, 21)................................................... 5

2 Metacoxa at least dorsally blackish brown, remainder reddish-brown or testaceous.................................. 3

- Metacoxa uniformly reddish-brown or testaceous............................................................ 4

3 Frons with median longitudinal ridge with a sharp, triangular ridge at middle; frons reddish-testaceous with orbits yellowish (Fig. 32).................................................................... A. crepuscularis Hopper, 1981 *

- Frons with median longitudinal ridge reduced to a short carina from base of median ocellus to between toruli; frons entirely and evenly reddish-brown (Fig. 31)............................................................ A. cachil sp. n.

4 Predominantly reddish-brown; hind tarsomeres 2–4 whitish (Fig. 24)................................. A. silviae sp. n.

- Predominantly testaceous; hind tarsomeres 2–4 brownish (Fig. 1)................................. A. augustoi sp. n.

5 Meso- and metasoma concolorous, testaceous (Fig. 18)........................................................ 6

- Color of mesosoma contrasting with that of metasoma (Fig. 12), or mesosoma of two colors.......................... 7

6 Antenna with 36 flagellomeres; lower face and orbits fulvous........................ A. guatemalenus (Cameron, 1886)

- Antenna with 44–50 flagellomeres; lower face and orbits (except next to lateral ocelli) yellowish (Fig. 34).. A. ruthae sp. n.

7 Lateral ocelli separated from compound eyes by 0.3× their own maximum diameters; mesosoma mainly reddish brown, black ventrally on propleuron and mesopleuron; antenna with 36 flagellomeres; mesoscutellum centrally flat............................................................................................ A. arcei Gauld & Bradshaw, 1997

- Lateral ocelli separated from compound eyes by less than 0.1× their own maximum diameters; mesosoma blackish brown (Fig. 33); antenna with 47–48 flagellomeres; mesoscutellum centrally concave............................. A. paolae sp. n.