Dryinus hamulus Coelho, Aguiar et Engel, 2011

Coelho, Beatriz W., Aguiar, Alexandre P. & Engel, Michael S., 2011, A survey of Dryinidae (Hymenoptera, Chrysidoidea) from Caxiuanã, Amazon Basin, with three new taxa and keys to genera and species, Zootaxa 2907, pp. 1-21 : 9-11

Dryinus hamulus Coelho, Aguiar et Engel , sp. nov.

( Figs 10–13 )

Diagnosis. The female of D. hamulus is most similar to D. bocainanus ( Olmi, 1987) but differs in the color of the pronotum, mesoscutum, mesopleura, and propodeum (fully or partially black in D. bocainanus ), OL as long as POL, OOL approximately 1.5 × POL (OL shorter POL, OOL as long as POL in D. bocainanus ), fore wing with three dark transverse bands (two bands in D. bocainanus ), distal part of Rs about 2 × longer than proximal part (3 × in D. bocainanus ), and protarsomere 3 produced into a hook.

Description. FEMALE. Fully winged; body length 3 mm; head testaceous, lower area of frons, clypeus, and mandible whitish; antenna testaceous, segments 1–2 whitish; pronotum, mesothorax, and metathorax testaceous, mesoscutum darkened, chestnut brown; propodeum brown; petiole black; metasoma testaceous, median area of posterior marginal zones of T1–T4 brown; legs testaceous with parts whitish, metafemur partly brown. Antenna distally thickened; antennal segments in following proportions: 17:8:34:20:18:14:12:12:10:16; head almost flat, granulate; frontal line absent; occipital carina incomplete, only visible behind and lateral to ocellar triangle, but not reaching compound eyes; OL as long as POL, OOL approximately 1.5 × POL, posterior ocelli touching occipital carina; pronotum granulate, disc weakly humped, with anterior and posterior weak transverse impressions; anterior and posterior collar weakly visible; pronotal tubercles not reaching tegulae; mesoscutum, mesoscutellum, and metanotum granulate; notauli incomplete, weakly visible, reaching approximately 0.5 length of mesoscutum; propodeum reticulate rugose, granulate, weakly reticulate rugose on dorsal surface, posterior surface with two longitudinal keels; fore wing with three brown transversal bands, proximal band lighter and smaller than others; distal portion of Rs vein about 2 × longer than proximal portion; tibial spur formula 1–1–2; protarsomere 1 slightly shorter than protarsomere 4; protarsomere 3 produced into hook; enlarged pretarsal claw without subapical tooth, with broad apical lamella and row of six smaller lamellae; protarsomere 5 with row of about 10 lamellae; apex with group of approximately eight lamellae.

MALE. Unknown.

Material examined. BRAZIL: Holotype Ƥ ( MPEG), PA, Melgaço, Caxiuanã, trail at Estação Científica Ferreira Pena, P05004, 13–16.XI.2003, YPT, A.P. Aguiar & J. Dias.

Distribution. The species is known from type locality only.

Etymology. The specific epithet is a diminutive form of the Latin term hamus, meaning “hook” with reference to the hooked protarsomere 3 distinctive of this species relative to D. bocainanus .

Comments. Dryinus hamulus shares with D. bocainanus the sculpturing of head and mesossoma, incomplete occipital carina, posterior ocelli touching occipital carina, length of notauli, and protarsomere 1 is shorter than protarsomere 4. According to the key to species-groups of Neotropical Dryinus proposed by Olmi (1993), the new species belongs to lamellatus group (formerly Chelothelius Reinhard 1863 ). The key to females of Neotropical Dryinus (sensu Olmi 1993) published by Olmi (1992) can be modified as follows so as to permit identification of the present species:

8 Fore wing with a single dark transverse band............................................................... 9 - Fore wing with three dark transverse bands ( Fig. 12 )......................................................... 10 9 Occipital carina incomplete; frons with weak keels; mesoscutum black.............................. D. pegnai (Olmi) - Occipital carina complete; frons without keels; mesoscutum reddish brown............................ D. rufus (Olmi) 10 Occipital carina laterally reaching compound eyes; protarsomere 1 longer than protarsomere 4; dorsal surface of propodeum

with two median, parallel, longitudinal keels and with numerous lateral curvilinear keels, integument not reticulate rugose...

....................................................................................... D. parkeri (Olmi) - Occipital carina laterally not reaching compound eyes ( Fig. 12 ); protarsomere 1 shorter than protarsomere 4; dorsal surface of

propodeum reticulate rugose ( Fig. 13 )................................................................... 10’ 10’ OL shorter POL, OOL as long as POL; fore wing with two dark transverse bands; distal portion of Rs about 3 × longer than

proximal portion; protarsomere 3 not produced into a hook.................................... D. bocainanus (Olmi) - OL as long as POL, OOL approximately 1.5 × POL; fore wing with three dark transverse bands ( Fig. 12 ); distal portion of Rs

about 2 × longer than proximal portion ( Figs 10 , 12 ); protarsomere 3 produced into a hook............ D. hamulus sp. nov.

Figures

FIGURE 10. Dryinus hamulus sp. nov., holotype, habitus, lateral view.

FIGURES 11 – 13. Dryinus hamulus sp. nov., holotype. 11. Head, anterior view; 12. Habitus, dorsal view; 13. Propodeum, dorsal view.