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

(Figs 162–168)

Female. Body length (Fig. 162): 3.0 mm. Body color: head black-dark brown except pedicel, scape, face, clypeus and basal half of gena yellow; mesosoma black except fore legs, middle legs and propleura yellow, pronotum dorsally brown and ventrally yellow, and fore legs yellow with tarsus and tibia brown; wings slightly infuscated; metasoma black-dark brown. Head (Figs 163–164): antenna with 25 flagellomeres; flagellar length/width ratios as follows: F1 = 3.1, F10 = 2.1, F25 = 2.7; 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 0.2 × eye height; malar space equal to basal mandible width; gena pubescent, except glabrous around eye; shortest distance between eyes as long as clypeus width; eye in lateral view 1.8 × taller than wide; lateral ocellus separated from compound eye by a distance 1.4 × ocellar width; frons pubescent; vertex pubescent; temple pubescent; temple width 0.8 × eye width; occipital carina thick and complete. Mesosoma: pronotum glabrous and smooth in lateral view; propleuron smooth; median mesonotal lobe pubescent; lateral mesonotal lobes pubescent; notauli either absent or only present anteriorly (Fig. 166); pit on mesoscutum small and oval (Fig. 166); scutellar sulcus with one carina; scutellar disc pubescent; mesopleuron pubescent, with two glabrous areas medially; precoxal sulcus absent; metanotum carinated; metapleuron pubescent; propodeum pubescent except dorsum glabrous; propodeum subdivided into anterior and posterior halves by a strong transverse carina, and with a median-longitudinal dorsal carina present (Fig. 165); propodeum surfaces rugose except smooth areas on dorsum. Legs: hind coxa 1.3 × longer than middle coxa; hind femora length 3.9 × maximum width; hind tibia length 9.8 × longer than maximum width; hind tibial spur 0.4 × as long as hind basitarsus; ratio of hind tarsomeres from basitarsus apically 18:9:8:610. Wings: fore wing length 3.0 mm; pterostigma 3.1 × longer than maximum width; length of marginal cell 2R1 along anterior wing margin 1.0 × the pterostigma length; vein r-rs 0.4 × as long as pterostigma width; vein Rs+M absent; ven m-cu basal with vein RS; hind wing with three sickleshaped hamuli. Metasoma: first tergite basally 0.8 × as wide as apical width, and 1.5 × longer than apical width; first tergite with costae longitudinally almost parallel, except apical border and apical-medial area smooth (Fig. 167); spiracle of tergum one situated on lateral margin near to the basal quarter of segment; hypopygium long, ventrally convex and with dorsal margin rounded; ovipositor sheath 3 × longer than basal width, and 1.6 × as long as basitarsus; ovipositor sheath pubescent, and terminating in a rounded area (Fig. 168).

Male. Unknown.

Holotype female. COSTA RICA: San Jose, Zurqui de Moravia, 1600 m, vi.1990, P. Hanson leg. Malaise. Deposited in UWIM.

Paratypes. Known only from the holotype.

Comments. Centistes pilosus, C. hirsutus and C. auricephalus share a conspicuous and distinctive pubescence on head and thorax. However, among them C. pilosus is the only one without the vein Rs+M on the fore wing.

Etymology. The dense pubescence on head and mesonotum is underlined by the specific epithet “ pilosus ”, which means pubescent.