Tachardiobius Timberlake, 1926

Triapitsyn, Serguei V., 2008, A review of Tachardiobius (Hymenoptera: Encyrtidae), with description of a new species from California, USA, a parasitoid of Tachardiella spp. (Hemiptera: Kerriidae), Zootaxa 1716, pp. 44-52 : 45

Tachardiobius Timberlake, 1926

( Figs 1–18 )

Tachardiobius Timberlake 1926: 19 –22; De Santis 1964: 214 –215; Noyes 1980: 231. Type species: Tachardiobius nigricans Timberlake , by monotypy and original designation.

Diagnosis. FEMALE. Body length 0.83–1.70 mm. Body and appendages mostly brown to dark brown, with light brown or whitish areas or patches; body nonmetallic and mostly dull, at most mesonotum slightly shiny. Occipital margin almost sharp. Antennal scrobes as deep grooves meeting above and interantennal prominence usually narrow and sharp, but sometimes more broadly narrowing above; frontovertex with a deep, rounded incision in dorsal view. Antenna slender, not broadened; scape much longer than wide; pedicel subconical, longer than wide; funicle 6–segmented, with funicle segments usually more or less longer than wide but sometimes about as long as wide or wider than long; clava 3–segmented, with third claval segment rounded, nontruncate. Mandible with 2 teeth and a broad inner truncation; maxillary palpus 3– or 4– segmented, labial palpus 3–segmented. Wings not abbreviated; forewing with parastigma not broadened; marginal vein punctiform; stigmal vein rather long, notably wider distally than basally; postmarginal vein almost absent; marginal setae very short, disc hyaline or just slightly infuscate at apex of venation; linea calva almost entire, “closed” near posterior margin. Mesotibial spur rather short, not longer than mesobasitarsus. Hypopygium not reaching apex of gaster; ovipositor either not or just barely exserted beyond apex of gaster.

MALE. Body length 0.60–1.10 mm. Funicle segments longer than wide or wider than long, with setae not exceeding segments’ width. Antennal clava entire ( Fig. 16 ) or 2–segmented ( Fig. 6 ), sometimes the subdivision is indistinct or incomplete. Genitalia as in Figs 8 and 18 . Otherwise similar to female.

Figures

FIGURES 1 – 5. Tachardiobius nigricans, female (Riverside County, California, USA). 1. Antenna. 2. Head (rear view). 3. Middle leg. 4. Mesosoma and metasoma. 5. Forewing.

FIGURES 6 – 8. Tachardiobius nigricans, male (Riverside County, California, USA). 6. Antenna. 7. Forewing. 8. Genitalia.

FIGURES 9 – 11. Tachardiobius silvestrii, female (holotype). 9. Antenna. 10. Mesosoma and metasoma. 11. Forewings.

FIGURES 12 – 15. Tachardiobius vladimiri sp. n., female (holotype). 12. Antenna. 13. Head (rear view). 14. Mesosoma, metasoma, and legs. 15. Fore and hind wings.

FIGURES 16 – 18. Tachardiobius vladimiri sp. n., male (paratypes). 16. Antenna. 17. Forewing. 18. Genitalia.