Macreupelmus crassicornis (Cameron)

Gibson, Gary A. P., 2016, Revision of the Neotropical genus Macreupelmus Ashmead (Hymenoptera: Chalcidoidea: Eupelmidae), Zootaxa 4161 (1), pp. 81-115 : 97-99

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Macreupelmus crassicornis (Cameron)


Macreupelmus crassicornis (Cameron)

Figs 6, 7 View FIGURES 1 – 10. 1 – 5 , 52–62 View FIGURES 52 – 62

Lutnes crassicornis Cameron, 1884: 126 –127; pl. 6, fig. 15. Holotype ♀ ( BMNH), examined. Published type data: Panama, Volcan de Chiriqui, 3000 to 4000 feet, Champion.

Macreupelmus crassicornis (Cameron) ; Gibson, 1995: 219.

Type material. Cameron (1884) did not state the number of females on which he based Lutnes crassicornis , but unlike for the previous species description in the same paper ( L. dromedarius ), only a single length measurement was given rather than a range in length. For this reason I conclude the species was based on a singleton and interpret the BMNH female with the following labels as the holotype of M. crassicornis : V. de Chiriqui, | 3–4000 ft. | Champion / Type [red-bordered printed label] / Lutnes | crassicornis | Cameron type | B Ca Hy. i.126 / B.C.A. Hymen. I. | Lutnes | crassicornis | Cam. [upside down printed label] / NHMUK 0 10198543.

The holotype is uncontorted and glued by its mesosternum to a card rectangle, it’s left fore wing is glued to the card but the right wings are free with the hind wing attached to the fore wing. The female is entire except for the antennae, which are partly encased in glue on the card.

Description. FEMALE (habitus: Figs 6, 7 View FIGURES 1 – 10. 1 – 5 ). Head ( Fig. 52 View FIGURES 52 – 62 ) with face at least partly green to bluish-green ventrally but at least interantennal prominence, lower face, and parascrobal region ventrally with variably extensive reddish-violaceous to purple lusters; vertex and most of scrobal depression bluish ( Fig. 57 View FIGURES 52 – 62 ) but sometimes scrobes, scrobal depression dorsally, and frons variably extensively darker with reddish-violaceous to purple lusters or frons more green to greenish-blue along inner orbits; gena at least narrowly blue or purple along orbit but otherwise with variably extensive reddish-violaceous luster; vertex with dark setae mesally between inner orbits. Head with interorbital distance about 0.24–0.26× head width; OOL: POL: LOL: MPOD = 0.25–0.35: 0.8– 1.0: 1.0–1.1: 1.0; distance between anterior ocellus and inner orbit about 1.0–1.1× MAOD; frons with anterior ocellus about 1.1–1.3× MAOD from dorsal limit of scrobal depression and with sulcus extending from anterior ocellus to within depression dorsally; scrobal depression, vertex and frons ( Fig. 57 View FIGURES 52 – 62 ) including interantennal prominence usually entirely micropunctate-reticulate or frons mesally below anterior ocellus sometimes partly coriaceous. Antenna dark brown except apical two clavomeres with at least ventral micropilose sensory regions paler ( Fig. 6 View FIGURES 1 – 10. 1 – 5 ); scape robust-compressed, about 3.5–3.9× as long as medial width, and in lateral view apex of pedicel extending to or only slightly beyond ventral margin when at right angle to scape.

Mesoscutum not or variably distinctly and extensively carinate mediolongitudinally from posterior of anteromedial lobe partly through posteromedial depressed region; scutellar-axillar complex with axillae and scutellum similarly coarsely meshlike reticulate but reticulations on scutellum aligned more longitudinally so to sometimes appear partly strigose. Front leg dark brown except tarsus sometimes paler, more orangish. Middle leg ( Figs 6 View FIGURES 1 – 10. 1 – 5 , 60 View FIGURES 52 – 62 ) dark brown with trochantellus (except ventrobasally) and femur apically white; posterior surface with distinctly differentiated region of longer white setae submesally ( Fig. 60 View FIGURES 52 – 62 ); tibia with 3–6 pegs in straight or only slightly offset row ( Fig. 61 View FIGURES 52 – 62 ). Hind leg dark except apex of coxa, trochanter, trochantellus, femur apically ( Fig. 59 View FIGURES 52 – 62 ), and tibia basally white, and usually extreme apices of one or more tarsomeres and sometimes entire second tarsomere orangish. Fore wing ( Figs 53, 54 View FIGURES 52 – 62 ) with dark setae continuously through hyaline basal cell onto infuscate basal part of disc, but distal to basal cell mediocubital fold with at least a few white setae ( Fig. 54 View FIGURES 52 – 62 ) that usually extend slightly onto infuscate part of disc anterior of fold; with small hyaline region with white setae along posterior margin opposite anterior hyaline region ( Fig. 54 View FIGURES 52 – 62 ); costal cell dorsally bare except in front of parastigma. Propodeum ( Fig. 58 View FIGURES 52 – 62 ) with plical region very short, with foramen broadly ∩-like incurved virtually to medially, narrowly V-like incised anterior margin, with posterior margin of foramen not vertically raised and transversetriangular panels reticulate-rugulose.

Gaster ( Fig. 62 View FIGURES 52 – 62 ) mostly dark brown dorsally, but under some angles of light with purple to reddish-violaceous lusters laterally on Gt1–Gt5 and sometimes dorsally on Gt5 to syntergum, though Gt6 and syntergum more commonly with slight bluish luster; Gt6 sometimes meshlike coriaceous basally but shallowly meshlike reticulate at least apically. Ovipositor sheaths longer than metatibia ( Fig. 6 View FIGURES 1 – 10. 1 – 5 ), about 1.1–1.2× metatibia length.

Material examined. COSTA RICA. Alajuela, Penas Blancas , 700m, III.1987 (1 CNC), IV.1987 (1 CNC), E. Cruz, primary rain forest, MT . Alajuela, Penas Blancas, Cord Tilaran , 700m, XII.1986, E. Cruz (1 CNC) . Cartago, Dulce Nombre, Vivero Linda Vista , 1300m, VIII–X.1993 (2 MZUCR), II–IV.1 994 (1 MZUCR), P. Hanson. Gste [Guanacaste] Pr. , Guanacaste Nat. Pk., Est Mengo Vn Cacao, 100m, V.1988, I.D. Gauld & D.H. Janzen (9 CNC, 5 CNC Photo 2016-25 – 2016-29). Guanac. Volcán Cacao, Cerro Pedregal, 1000m, II–IV.1989, I. Gauld (1 CNC) . San José, San Antonio de Escazú , 1300m, VI.1993, moving like an ant, E. Eberhard & P. Hanson (1 MZUCR) .

Distribution (Map 1A). Costa Rica *, Panama.

Remarks. Females of M. crassicornis form a species trio along with M. aurantispina and M. nigrispina , as discussed under M. aurantispina . As discussed under M. dromedarius , any females of the latter species with only a few, inconspicuous white setae on the basal fold that incompletely separate the dark setae of the basal cell and disc ( Fig. 71 View FIGURES 63 – 71 ) could be keyed through the second half of couplet 1 to couplet 4 near M. crassicornis because of similar propodeal structures and fore wing setal color patterns. However, females of M. dromedarius have at least a few dark setae dorsomesally in the costal cell ( Fig. 66 View FIGURES 63 – 71 ) and the only one seen without the dark setae of the basal cell and disc being obviously separated by white setae has a distinct preapical white region on the metafemur similar to that of M. nigrispina ( Fig. 109 View FIGURES 106 – 115 ).


Canadian National Collection of Insects, Arachnids, and Nematodes














Macreupelmus crassicornis (Cameron)

Gibson, Gary A. P. 2016

Macreupelmus crassicornis

Gibson 1995: 219

Lutnes crassicornis

Cameron 1884: 126