Enizemum tridentatum Dasch 1964a

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 53

Enizemum tridentatum Dasch 1964a

Diagnosis. Fore wing length 4.5.– 6.5 mm. Antenna in females dark brown, with 22–24 flagellomeres, with ventral surface of the apical flagellomeres covered with a velvety pile, devoid of multiporous plate sensilla which are restricted to lateral and dorsal sides; in males with 22–23 flagellomeres and broad tyloids on flagellomeres 6/7 to 13/14. Mesoscutum and mesopleuron with punctures dense, interspaces smooth and shining, less so in some specimens on mesopleuron. Propodeum with pleural and lateral longitudinal carinae present as traces, but median longitudinal and transverse carinae usually absent. First tergite with median dorsal carinae converging over basal half, forming a rather blunt angle and subparallel on apical half of the tergite, although this character is somewhat intermediate between E. ornatum ( Fig. 14 E) and E. nigricorne ( Fig. 14 F). Second tergite with basal carinae often weak.

Colouration of females. Antenna black. Head and mesosoma black, face often with a small yellow central face patch, clypeus and mouthparts orange or dark, yellow-marked on hind corner of pronotum, tegula, subtegular ridge, often with shoulder mark and upper mesepimeron; scutellum often with a yellow tip. Legs and coxae orange; femora orange; hind tibia with a white base, remainder dark, hind tarsus dark. Metasoma black.

Colouration of males. As in females but with yellow ventrally on scape and pedicel, antenna paler below; face yellow, often except for two black vertical lines arising from below antennal scrobes, propleuron, epicnemium, large part of mesosternum and often mesopleuron ventrally; mesopleuron sometimes marked with orange below. Fore and mid coxae and legs often largely yellow. Hind tibia often with basal white marking extended to more than half the length of the tibia.

Material examined. New for Tadzhikistan: E. Peter I Mt region, 7 km S Tadshikabad, Mirzaen v. 1800 m, leg. Osipov, 22.VII.2004. 1♂, at MR .

Additional material. Russia, Kwak, 35 km from Stalinabad, 2000m, 16.VI.1938. 1♂, at ZSM . USA, Wyoming, Yellowstone NP, 1B 6.8mi N S. Entrance, Malaise trap in heavy burn, 12.VIII.1990. 1♀, at UWL . USA, Maine, Mount Blue, 20.IX.–6.X.1969. 1♀, at ZSM . USA, Alaska, Mt. McKinley, 2700', leg. David Townes, 8.VIII.1954, 1♀, 5.VIII.1954, 1♂, both at AEI.

Distribution. Holarctic.

Notes. This species can sometimes be difficult to distinguish from E. nigricorne .

Figures

FIGURE 14. A. Phthorima compressa ♀, metasoma. B. Enizemum ornatum ♀, hind tibia. C. Enizemum ornatum ♂, hind tibia. D. Homotropus frontorius ♀, hind tibia. E. Enizemum ornatum ♀, first tergite. F. Enizemum nigricorne ♀, first tergite. G. Homotropus elegans ♀, first tergite. H. Homotropus sundevalli ♀, first tergite. I. Enizemum ornatum ♀, clypeus. J. Homotropus elegans ♀, clypeus. K. Fossatyloides gracilentus ♂, antenna. L. Fossatyloides gracilentus ♀, propodeum. M. Homotropus pictus ♀, propodeum. N. Homotropus crassicornis ♀, propodeum.