Diolcogaster

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Taxonavigation

Ordo: Hymenoptera
Familia: Braconidae

Name

Diolcogaster Ashmead, 1900 – Wikispecies link – Pensoft Profile

• Diolcogaster Ashmead 1900, 23(1206): 132; Viereck 1913, 46: 366; Viereck 1914, 83: 46; Viereck (1916)1917, 22: 202; Lyle 1918 51: 104, synon. by Szépligeti; Mason 1981 115: 113; Marsh et al. 1987 13: 32; Austin and Dangerfield 1992, 6(1): 5, 25; Whitfield 1997, No. 1: 337; Chen and Song 2004: 175. Type species: Microgaster brevicaudus Provancher, 1886. Designated by Viereck 1914.
• Zadiolcogaster Viereck 1913, 46: 366; Viereck 1921, 59: 147, synon. by Muesebeck and Walkley 1951.Type species: Zadiolcogaster anomus Viereck, 1913.

Diagnosis

Areolet of fore wing present, large or small, quadrangular or triangular; vannal lobe with margin usually convex and setose but sometimes varying to straight and setose and exceptionally concave and without setae. Side of pronotum always with ventral groove, rarely with dorsal groove. Propodeum usually rugose but occasionally smooth; median longitudinal carina strong and complete.
First tergite of metasoma bearing a sharp median longitudinal groove through most of its length; but varying from short and expanded apically to strongly narrowed, lorate. Second tergite with well- or ill-defined median field. Third tergite smooth, but strongly rugose when the second one is similarly sculptured. Hind coxa large, inner hind tibial spurs usually long.
Hypopygium short and inflexible. Ovipositor sheaths short, usually with dense setae near the apex; sheaths of most species with a few modified strong setae.

Key to species of the genus Diolcogaster Ashmead, 1900 from China

Key to species of the genus Diolcogaster Ashmead, 1900 from China — J. Zeng , J. He , X. Chen

1		Tip of scutellum polished, not interrupting posterior, polished band of scutellum at middle; vein r-m of fore wing arising from vein r+3-SR so that areolet is 4-sided    2
–		Rugose tip of scutellum interrupting posterior, polished band of scutellum at middle; areolet of fore wing various in shape    5
2		Metacarp short, shorter than twice as long as its distance from apex of marginal cell; T2 highly polished, shorter than T3    Diolcogaster brevivena Zeng & Chen, sp. n.
–		Metacarp longer, at least twice as long as its distance from apex of marginal cell; T2 more or less rugose to rugulose, slightly longer than T3    3
3		Propodeum with a weak and incomplete median keel    Diolcogaster alvearia (Fabricius, 1798)
–		Propodeum with a strong and complete median keel    4
4		Vein r of fore wing as long as or slightly shorter than vein 2-SR; disc of scutellum finely, discretely punctate; T2 with a shiny and feebly longitudinally striated raised median field, irregularly shaped but distinctly narrowed behind; the lateral fields striate-rugose, but reduced toward lateral margin    Diolcogaster praritas Zeng & Chen, sp. n.
–		Vein r of fore wing much longer than vein 2-SR; disc of scutellum with dense punctures, larger laterally; T2 transverse, shortened medially, with a raised pentagonal median field, shiny but densely rugulose all over    Diolcogaster punctatiscutum Zeng & Chen, sp. n.
5		Antennae of female very short, segments 10–12 being hardly longer than wide; metacarp short, shorter than 1.5× as long as its distance from apex of marginal cell; T2 divide by two curved, more or less rugose and ][-shaped grooves into three fields of which the middle one is triangular and narrowest behind    Diolcogaster spreta Marshall,1885
–		Antennae of female long, all segments distinctly longer than wide; metacarp longer, at least twice as long as its distance from apex of marginal cell; T2 never that sculptured    6
6		Vein r-m of fore wing arising from vein r+3-SR so that the areolet is 4-sided; vein 1-CU1 much shorter than 2-CU1    7
–		Vein r-m of fore wing more or less interstitial with vein r (1st abscissa of the radius) so that the areolet is virtually 3-sided; relative length of vein 1-CU1 variable    8
7		T2 as long as T3; T3 with traces of rugosity; vein r arising from distal 1/2 of pterostigma, far behind the middle    Diolcogaster laetimedia Zeng & Chen, sp. n.
–		T2 distinctly shorter than T3; T3 highly polished; vein r arising from distal 1/2 of pterostigma, but only slightly behind the middle    Diolcogaster perniciosa (Wilkinson, 1929)
8		T3 as heavily sclerotised as T2, the two tergites together forming a sculptured carapace, beneath which the more apical tergites are completely or partially hidden; fore wing marked with brown patches at apex    9
–		T3 usually smooth, polished and never forming a carapace with T2 such as above; fore wing without patches at apex    10
9		Ovipositor sheath with a thickened seta; T1 distinctly widened posteriorly; posterior margin of T3 rounded, emarginated medially; forewing with apical spot dark brown    Diolcogaster chaoi (Luo & You, 2003)
–		Ovipositor sheath without trace of apical, modified setae; T1 slightly widened posteriorly; T3 subrectangular, with posterior margin straight, not emarginated medially; forewing with apical spot slightly infuscate    Diolcogaster bifurcifossa Zeng & Chen, sp. n.
10		T2 without trace of median field, rugose more or less all over; vein 1-CU1 distinctly shorter than 2-CU2; mesoscutum shiny, with very dense and evenly discrete punctures    Diolcogaster ineminens Zeng & Chen, sp. n.
–		T2 with a more or less distinct median field that varies in shape but is never triangular or widened posteriorly, though sometimes is widened anteriorly; vein 1-CU1 slightly longer than 2-CU2; sculptures of mesoscutum variable    11
11		T1 linear, very long and narrow, more than thrice as long as its width; propodeum with weak median keel; T2 with a distinctly raised pentagonal median field that is sharply-sided and with smooth and shiny surface, area beside median field setose and also smooth and shiny; pterostigma brown, except basal pale spot    Diolcogaster grammata Zeng & Chen, sp. n.
–		T1 not linear, not more than 2.5× as long as its width; propodeum with strong complete median keel; T2 without such a raised pentagonal median field; pterostigma without a basal pale spot    12
12		T2 with an elongated median field that is not triangularly widened behind; vein 1-R1 more than four times as long as its distance from the apex of the marginal cell; POL much longer than OD; vertex and frons densely rugose; face at upper half with very indistinct median longitudinal carina    Diolcogaster translucida Zeng & Chen, sp. n.
–		T2 with an ill-defined median field, only slightly swollen; vein 1-R1 with distal end almost reaching to apex of marginal cell; POL about 1.5× as long as OD. Vertex finely transversely striate; frons polished and without setae in large part but densely rugulose and setose adjacent to eye margin; face without any trace of median keel    Diolcogaster pluriminitida Zeng & Chen, sp. n.

Taxon Treatment

• Zeng, J; He, J; Chen, X; 2011: The genus Diolcogaster Ashmead, 1900 (Hymenoptera, Braconidae, Microgastrinae) from China ZooKeys, 129: 49-87. doi