Centistes sergeyi Aguirre, Almeida & Shaw

Aguirre, Helmuth, Almeida, Luis Felipe Ventura De & Shaw, Scott Richard, 2017, Revision of the genus Centistes (Hymenoptera: Braconidae: Euphorinae: Centistini) of Costa Rica, Zootaxa 4216 (1), pp. 1-46 : 41-42

Centistes sergeyi Aguirre, Almeida & Shaw , sp. n.

( Figs 176–182 )

Female. Body length ( Fig. 176 ): 2.8 mm. Body color: head black except pedicel, scape and ventral half of clypeus brown; mesosoma black; legs honey yellow except middle coxa, hind and middle tarsus dark brown and hind coxa black-dark brown; wings hyaline; metasoma black-dark brown. Head ( Figs 177–178 ): antenna with 22 flagellomeres; flagellar length/width ratios as follows: F1 = 2.5, F10 = 2.0, F22 = 2.3; last flagellomere terminating apically in a sharp point; pedicel as long as wide; scape 1.5 × longer than wide; mandibles when closed overlapping for 0.5 × mandible length; mandible width basally 0.4 × mandible length; malar space 0.3 × eye height, and 1.2 × basal mandible width; gena sparsely pubescent; shortest distance between eyes 1.3 × greater than clypeus width; eye in lateral view 2.3 × taller than wide; lateral ocellus separated from compound eye by a distance 1.5 × ocellar width; frons glabrous; vertex with a few scattered setae; temple with few scattered setae; temple width 1.4 × eye width; occipital carina thick and complete. Mesosoma: pronotum glabrous; pronotum in lateral view laterally smooth, dorsally costate-rugulose; propleuron with anterior and medial margins rugose, remaining surfaces smooth; median mesonotal lobe pubescent anteriorly, glabrous posteriorly; lateral mesonotal lobes glabrous, except lateral borders pubescent; notauli either absent or only present anteriorly ( Fig. 180 ); pit on mesoscutum large and oval, bisected by a longitudinal carina ( Fig. 180 ); scutellar sulcus with one carina; scutellar disc sparsely pubescent; mesopleuron pubescent except glabrous area centrally; precoxal sulcus foveate; metanotum irregularly longitudinally carinated; metapleuron pubescent; propodeum pubescent except dorsum glabrous; propodeum subdivided into anterior and posterior halves by a strong transverse carina, and without a median-longitudinal dorsal carina ( Fig. 179 ); propodeum surfaces rugose except smooth areas on dorsum. Legs: hind coxa 1.4 × longer than middle coxa; hind femora length 4.4 × maximum width; hind tibia length 8.7 × longer than maximum width; hind tibial spur 0.4 × as long as hind basitarsus; ratio of hind tarsomeres from basitarsus apically 18:10:9:7:9. Wings: fore wing length 2.9 mm; pterostigma 2.6 × longer than maximum width; length of marginal cell 2R1 along anterior wing margin 0.9 × the length of pterostigma; vein r-rs 0.3 × as long as pterostigma width; vein Rs+M complete; vein m-cu basal with vein RS; hind wing with three sickle-shaped hamuli. Metasoma: first tergite basally 0.5 × as wide as apical width, and 1.3 × longer than apical width; sculpture of first tergite longitudinally costate with costae almost parallel ( Fig. 181 ); spiracle of tergum one situated on lateral margin near the basal quarter of segment; hypopygium short, ventrally folded, dorsal margin rounded, and posterior margin truncated; ovipositor sheath 1.8 × longer than basal width, and 1.3 × as long as basitarsus; ovipositor sheath densely pubescent, and terminating in a rounded ( Fig. 182 ).

Male. Body length: 2.0 mm. Body color: same as female. Head: antenna with 21 flagellomeres; mandibles when closed overlapping for 0.6 × mandible length; mandible width basally 0.5 × mandible length; Malar space equal to eye height, and 1.3 × basal width of mandible; shortest distance between eyes 1.4 × greater than clypeus width; eye in lateral view 2.1 × taller than wide; lateral ocellus separated from compound eye by a distance 2.0 × ocellar width; frons glabrous, except sparse setae around eyes; temple width 1.2 × eye width. Mesosoma: median mesonotal lobe anteriorly pubescent, posteriorly glabrous; scutellar sulcus with three carinae; propodeum pubescent. Wings: fore wing length 2.8 mm; vein M almost absent.

Holotype female. COSTA RICA: Cerro de la Muerte , 26 km N. San Isidro, 2100 m, ii–v.1992, P. Hanson leg., Malaise. Deposited in UWIM.

Paratypes. COSTA RICA: One male, Cartago, 4 km N.E. Canõn Genesis II, 2350 m, ii–iii.1995, P. Hanson leg., Malaise. Deposited in UWIM.

Comments. The presence of a pit on notauli and the complete vein Rs+M are distinctive features shared by C. sergeyi , C. cartagoensis and C. puntarenensis . Nonetheless, the shorter and broad ovipositor sheaths of C. sergeyi contrast with the long and narrow ones seen in the other two species.

Etymology. This species is named in honor of Dr Sergey Belokobylskij, prominent Russian braconidologist.

Figures

FIGURES 176 – 182. Centistes sergeyi sp. n. 176) Lateral habitus, 177) anterior head, 178) dorsal head, 179) propodeum, 180) mesoscutum, 181) dorsal metasoma, 182) ovipositor sheaths with ovipositor partly protruding.