Dicoelothorax parviceps Cameron

Torrens, Javier & Heraty, John M., 2012, Description of the species of Dicoelothorax Ashmead (Chalcidoidea, Eucharitidae) and biology of D. platycerus Ashmead, ZooKeys 165, pp. 33-46: 33

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Dicoelothorax parviceps Cameron


Dicoelothorax parviceps Cameron  Figs 1-5

Dicoelothorax parviceps  Cameron 1913: 117-118; De Santis 1979: 107; De Santis 1980: 211; Heraty 2002: 130. Type female in BMNH 5.364 [examined], UCRC_ENT 310015.


Distinguished from Dicoelothorax platycerus  by the mesosoma and frenal processes having distinct, widely spaced longitudinal striae (Figs 2, 5); dorsal concavity of mesoscutum and scutellum smooth medially (Fig. 2); frenal processes in dorsal view distinctly tapered with apex narrowly rounded (Figs 2, 5); venation yellow with stigma pale brown; scutellar processes of male white and straight in lateral view, and 1.6 × as long as scutellum (Figs 4, 5).

Female. Length3.8 mm. Head, mesosoma, coxae, petiole and Gt1 except distal part black; basal ¾ of femora, frenal processes, distal part of Gt1 and rest of terga brown; antenna yellowish to light brown; rest of legs and distal limits of terga yellowish. Wings slightly infuscate, venation yellow, stigmal vein pale brown (Fig. 3).

Head 1.7 × as broad as high. Frons and face granulate, weakly strigose, with small and scattered setae (Fig. 1). Eyes separated by 2.3 × their height. Malar space as long as height of eye. Antenna with 8 segments; scape 2.9 × as long as broad, broader apically, smooth, with a few scattered setae. Length of flagellum 0.9 × height of head, basal flagellomere (homologous to F1+F2; Heraty 2002) as long as scape (BF, Fig. 1), following flagellomeres serrate, clava rounded (Fig. 1).

Mesosoma. Midlobe of mesoscutum elevated anteriorly, with short, thin, decumbent and scattered setae; striate-rugose on anterior face of mesoscutum, sidelobes longitudinally striate, midlobe dorsally smooth and concave (Figs 2, 3). Axilla and scutellar disc smooth and concave dorsally, scutellar disc longitudinally striate laterally. Scutoscutellar sulcus (SSS) weakly crenulate dorsally; deeply invaginated and smooth laterally. In dorsal view, frenal processes tapering toward narrowly rounded apex, with longitudinal striae distinct and widely spaced; processes 3.8 × as long as maximum width and 2.1 × as long as scutellum (frp, Fig. 2), in profile curved over gaster. Upper half of mesepisternum and mesepimeron longitudinally striate. Hind coxa semiglobose, 1.9 × as long as broad; with weak longitudinal striae and scattered, thin setae. Hind femur densely setose. Forewing 2.8 × as long as broad; stigmal vein slender and perpendicular to wing margin, 3.3 × as long as broad; postmarginal vein indistinct but present and about as long as stigmal vein (Fig. 2).

Metasoma. Petiole 4.1 × as long as broad, 1.8 × as long as hind coxa and 1.2 × as long as hind femur; First gastral tergite (Gt1) smooth and without setae (Gt1, Fig. 3).

Male. Length 2.4 mm. Similar to female except for following. Antenna brown, frenal processes and venation completely white; Gt1 and following segments yellowish (Figs 4, 5); forewing hyaline. Head 1.3 × as long as high. Eyes separated by 2.1 × their height. Malar space 0.9 × as height of eyes. Antenna pectinate; scape shorter than female, 2.4 × as long as broad; branch of basal flagellomere 0.9 × as long as height of head, following flagellomeres with branches progressively decreasing in length (Fig. 4). Mesoscutal depression rugose (Fig. 5); axilla and scutellar disc narrower than mesoscutum and with longitudinal striae. SSS deeply crenulate dorsally. Frenal processes smaller than female; frenal processes 4.3 × as long as maximum width, 1.6 × as long as scutellum; spines straight in lateral view (Figs 4, 5). Mesepisternum and mesepimeron with weak striae. Hind coxa 1.8 × as long as broad. Petiole 3.4 × as long as broad, 2.0 × as long as hind coxa.

Biology of Dicoelothorax parviceps  .


Material examined.

COLOMBIA. Vichada, P. N. Tuparro, 16.vi.2000, Sharkey, UCRC_ENT 161564 (1 female, UCRC); same location and data, UCRC_ENT 92180 (1 male, UCRC).