Bracon (Bracon) tenuicornis Wesmael, 1838

Papp, Jenő & Xviii, Budapest, 2012, A revision of the Bracon Fabricius species in Wesmael’s collection deposited in Brussels (Hymenoptera: Braconidae: Braconinae), European Journal of Taxonomy 21, pp. 1-154: 97-100

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Bracon (Bracon) tenuicornis Wesmael, 1838


Bracon (Bracon) tenuicornis Wesmael, 1838  

Fig. 47 View Fig A-K

Braco tenuicornis Wesmael, 1838: 42   ♀ (type material: 1 ♀), type locality: “environs de Bruxelles ” ( Belgium), ♀ holotype (“J’ai pris une seule femelle de cette espèce...” Wesmael l.c., present designation) in the Royal Belgian Institute of Natural Sciences, Brussels; examined.

Braco tenuicornis   – Szépligeti 1901: 184 (in key, in Hungarian); 1904 (1901): 160 (in key, in German) ♀. Bracon (Orthobracon) tenuicornis   –Fahringer1927:271,273(♀),281 (♁)(in key) and425 (redescription) ♀ ♁, assigned to “Section Orthobracon   ”. — Telenga 1936: 162 (♀, in key), 249 (redescription) (in Russian) and 365 (in key, in German) ♀ ♁. — Shenefelt 1978: 1648 (literature up to 1971).

Bracon (Bracon) tenuicornis   – Tobias 1986: 129 (in key, in Russian). — Tobias & Belokobylskij 2000: 138 (in key, in Russian). — Papp 2008: 1753 (in key).

Designation of the ♀ holotype of Bracon tenuicornis   ( Fig. 47 View Fig A-H)

(First label, printed) “ Coll. Wesmael ”; (second label, printed) “2043”; (third label) “ Braco   ♀ / tenuicornis mihi” (handwriting) / “dét. C. Wesmael ” (printed); (fourth label, printed) “ Type ”; (fifth label, with my handwriting) “ Belgique / Bruxelles / VIII leg. Wesmael ” (above), “test J. Papp / 1987” (reverse); sixth label is the holotype card (labels 5-6 attached by me). Holotype is in good condition: (1) micropinned, pin thick hence mesoscutum almost invisible; (2) flagelli apically deficient.

Material examined

12 ♀♀ + 1 ♁ from six countries: SCOTLAND: 1 ♀. THE NETHERLANDS: 2 ♀♀ from two localities. GERMANY: 2 ♀♀ from one locality. SWEDEN: 1 ♀. HUNGARY: 3 ♀♀ + 1 ♁ from three localities. BULGARIA: 2 ♀♀ from two localities.

Redescription of the ♀ holotype of Bracon tenuicornis   ( Fig. 47 View Fig A-H)

LENGTH. Body 3.1 mm long.

ANTENNAE. Antennae deficient, left antenna with 30 and right antenna with 24 antennomeres (according to the original descripion antenna with 31 antennomeres). First flagellomere clearly twice and 28th flagellomere 1.8 times as long as broad.

HEAD. In dorsal view less transverse ( Fig. 47A View Fig ), 1.7 times as broad as long, eye 2.2 times longer than temple, temple constricted, occiput weakly excavated. Horizontal diameter of oral opening somewhat longer than shortest distance between opening and compound eye (cf. Fig. 40D View Fig ). Head polished.

MESOSOMA. In lateral view 1.6 times as long as high, polished. Propodeum polished, above lunule with short carina and above it surface uneven ( Fig. 47B View Fig ).

LEGS. Hind femur 2.8 times as long as broad medially ( Fig. 47C View Fig ). Claw downcurved, basal lobe large as in Fig. 47D. View Fig

WINGS. Forewing about as long as body. Pterostigma ( Fig. 47E View Fig ) four times as long as wide and issuing r proximally   from its middle, r as long as width of pterostigma. Second submarginal cell long, 3-SR 1.3 times longer than 2-SR, SR1 straight, twice as long as 3-SR and reaching tip of wing; 1-R1 just 1.5 times as long as length of pterostigma. First discal cell less high, 1-M 1.7 times as long as m-cu, 1-SR-M bent and 1.3 times longer than 1-M ( Fig. 47F View Fig ).

TERGITES. First tergite ( Fig. 47G View Fig ) 1.3 times as long as broad behind, beynd pair of spiracles faintly broadening, margin of scutum crenulated, scutum posteriorly and tergite laterally from scutum rugoserugulose. Second tergite transverse, three times as broad behind as long and as long as third tergite; suture between tergites 2-3 feebly bisinuate and finely crenulated. Second tergite medially rugose, laterally rugulo-granulo-uneven, further tergites with weakening sculpture. Ovipositor sheath just shorter than hind tibia, hind end of ovipositor sheath and ovipositor as in Fig. 47H. View Fig

COLOUR. Antenna dark brown, scape basally, pedicelle entirely and first flagellomere again basally testaceous. Head and tergites brownish black, mesosoma black. Oral organs and clypeus yellow. Tegula yellow with brownish suffusion. Legs yellow, coxae 2-3 basally blackish, fifth tarsomere light brownish. Second tergite latero-posteriorly with a pair of little yellow maculae. Sternites yellow with brownish pattern. Wings hyaline, pterostigma and veins yellow.

Variable features of the ♀ (12 ♀♀) ( Fig. 47 View Fig I-K)

Body 2.8-3.2, usually 3-3.1, mm long. Antenna with (20-)25-30 antennomeres. Penultimate flagellomere 1.6-1.8 times as long as broad. Temple in dorsal view somewhat more constricted ( Fig. 47I View Fig ). Propodeum with a carina and medially rugulose ( Fig. 47J View Fig ). Hind femur 2.8-2.9 times, rarely 4.1 times, as long as broad medially. First tergite more broadening posteriorly, i.e. somewhat longer than broad behind ( Fig. 47K View Fig ). Sculpture beyond first tergite rugulos to granulose. Dark colour either more or less extended, or tergites brown and head + mesosoma black to blackish.

Description of the ³ (1 ³)

Similar to the ♀. Body 2.2 mm long. Antenna with 26 antennomeres. Metasoma from fourth tergite smooth and shiny. Body black, legs yellow.


COL. Scolytidae   : Phloeophthorus scarabaeoides Bernard.  


Europe (so far known in six countries)

Taxonomic position

Bracon tenuicornis   is nearest to B. orbus Papp   ( Papp 1981; Hungary) albeit the latter species is ranged in the subgenus Glabrobracon   , the two species are similar to each other and are distinguished by a few features:

1 (2) Metasoma from second tergite with weakening sculpture (subgeneric difference of Bracon   s. str., Fig. 47G View Fig ). Head in dorsal view 1.7 times as broad as long, temple constricted ( Fig. 47A, I View Fig ). Second tergite as long as third tergite ( Fig. 47G View Fig ). Forewing: second submarginal cell less long, 3-SR 1.3 times longer than 2-SR ( Fig. 47E View Fig ). Propodeum medially either uneven or (less usually) with a mediolongitudinal carinula ( Fig. 47B, J View Fig ) .................................................... B. (B.) tenuicornis Wesmael, 1838  

2 (1) Metasoma less sculptured: second tergite (♀) or second and third tergites (♁) rugo-rugulose, further tergites polished (subgeneric difference of Glabrobracon   , Fig. 23H View Fig ). Head in dorsal view 1.6 times as broad as long, temple rounded ( Fig. 23G View Fig ). Second tergite somewhat longer than third tergite ( Fig. 23H View Fig ). Forewing: second submarginal cell long, 3-SR 1.5-1.6 times longer than 2-SR ( Fig. 30F View Fig ). Propodeum polished, around lunule with short rugulae(cf. Fig.3C View Fig ) .................. B. (Gl.) orbus Papp, 1981  














Bracon (Bracon) tenuicornis Wesmael, 1838

Papp, Jenő & Xviii, Budapest 2012

Bracon (Bracon) tenuicornis

Papp J. 2008: 1753
Tobias V. I. & Belokobylskij S. A. 2000: 138
Tobias V. I. 1986: 129

Braco tenuicornis

Shenefelt R. D. 1978: 1648
Telenga N. A. 1936: 162
Szepligeti Gy. 1901: 184

Braco tenuicornis

Wesmael C. 1838: 42