Odontacolus dayi sp. n. Figures 43, 125-130; Morphbank 49

Description.

Female. Body length: 1.68 mm (n=1). Antenna color: clava and A2 light honey yellow, remainder of antenna yellow. Body color: head and metasoma beyond T1 dark brown, mesosoma and T1 honey yellow. Coxae color: yellow. Leg color (excluding coxae): yellow. Fore wing color: slightly infuscate throughout.

Head. Size of compound eye: approximately 1/2 × height of head. Head shape in lateral view: lower head elongate and broad at mouth, head appearing elongate and somewhat thin. Sculpture of antennal scrobe: largely smooth ventrally, sparsely granulate ventrally. Surface of torular triangle: flat. Development of central keel on frons: present, elongate (equal to or greater than 1/3 × height of frons), but not reaching anterior ocellus. Sculpture on upper frons below anterior ocellus: granulose throughout. Sculpture of malar space: with sparse, short fan-like striae, striae not extending into scrobal area, mixed with weak coriaceous sculpture. Furrow at lateral portion of antennal scrobe: absent. Mesal surface of vertex: slightly depressed. Size of lateral ocelli: large. Distance between lateral ocellus and occipital carina: 0.5 –1.2× maximum ocellar diameter. Lagrimal: absent or minute. Length of OOL: less than or equal to 1/3 × width of ocellus. Sculpture of vertex: granulate. Sculpture of occipital carina: largely simple, at most with sparse weak crenulae medially. Distance from occipital carina to orbital carina: at least 2 × width of occipital carina. Shape of occipital carina: simply arcuate medially. Sculpture of occiput: with weak, small granulae. Sculpture of gena: granulose.

Mesosoma . Dorsal mesosoma in lateral view: convex. Sculpture of pronotal cervical area: with small (at most as large as crenulae on anterior edge of mesoscutum), well-defined foveae. Sculpture of pronotal lateral area: coriaceous. Netrion: present, smooth, well developed, sub-obovate. Notaulus: present, simple. Length of notaulus: approximately less than or equal to 1/3 of length of mesoscutum. Width of notaulus: narrow (notaulus width less than or equal to half the width of tegula). Sculpture of mesoscutum: weakly rugulose mixed with weak granulae. Sculpture of mesoscutellum: granulose. Mesoscutellar profile: elevated, anterior margin higher than posterior. Mesoscutellar shape: flat, not depressed. Lateral propodeal area: coarsely rugulose. Shape of propodeal anterior spine: elongate, narrow, apex rounded. Sculpture of propodeum between anterior spines: smooth or largely smooth. Sculpture of ventral half of mesepisternum: smooth or nearly so. Sculpture of upper 1/4 of mesopleuron: densely longitudinally costate across half width. Metapleural sculpture: largely smooth except lower half with longitudinal carinae.

Wings. Stigmal vein: present, elongate, narrow. Campaniform sensilla at distal area of stigmal vein: present.

Metasoma. Shape of T1 horn: narrow, short. Sculpture of upper portion of T1 horn: longitudinally carinate. Sculpture of posterior portion of T1 horn: largely smooth, with sparse longitudinal carinae. Lateral carinae on T2: present, well-defined. Sculpture of T2: largely weakly coriaceous mixed with longitudinal costae, meson coriaceous. Sculpture of T3: anterior half weakly, longitudinally costate, coriaceous mesally, otherwise weakly coriaceous. Sculpture of S3-S6: finely, weakly coriaceous. S2 anterior carina: present, cristate, uninterrupted.

Male. Unknown.

Diagnosis.

This is the only known species that has a longitudinally depressed vertex. In the Neotropics there is one undescribed species (in CNCI) with a very conspicuous longitudinal depression on the vertex, but the general sculpture of the body is very different from Odontacolus dayi .

Etymology.

This species is named after the hymenopterist M. C. Day, now retired from the Natural History Museum, London. The epithet is a noun in the genitive case.

Link to distribution map.

50

Material examined.

Holotype female: INDONESIA: Maluku Prov., Ceram (Seram) Isl., Solea, VIII– 1987, M. C. Day, OSUC 238418 (deposited in BMNH).

Comments.

The holotype is in perfect condition.