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A New Species of Blacus Nees Collected in Nests of Bombus lapponicus F, in North Sweden

(Hym., Ichneumonoidea, Braconidae)

By Kant.-JoHAN HEDevrsr S*'edish Natural Science Research (lounr:il c/o Dcpt. of Ent., Su,edish ]{useunr of Natural Historv

S-101

50 Stockholnr 50, Sweden

Abstract

Hroqvrsr, K.-J. .{ neu' species of Blacus Nces collecterl in nests of Bombus lapponicus

F. in North Su'eden (H1'm., Ichneumonoidea, Braconidae).

- Ent. 'I'idskr. 95: 184-185.

1974.

A nevl' species of sp.n., is described. It bumble bee. Bornbu.s

\orth Sq'eden.

Blacas Nees. I]. nidit'oln was collected in nests of

:r

Iopponicus F. in .\bisko.

Dtrling his studies of bumble bees in North Srveden Mr Il. G. Svensson has col-

lected some parasitic Hlmenoptera, among

them specimens of a new species of the genus Blacus Nees. It is described below.

Blacus nirlicola sp.n.

?. Illack *'ith gaster bro.rvnish black. Legs and rving veins brorvn.

Head (fig. I A, R) smooth. Antennae (fig.

I D) inserted nearer to median ocellus than

to the base of cl1'peus and lvith l7 joints.

All flagellar joints except first joint equal in length. Ocelli in an equilateral triangle.

Thorax finelv punctated, in front of scutellar furrorv at junction of notauli a rugose tri- angular area. Scutellar furrorv rugose.

Scutellum flat not r.nargined, smooth on the disc and punctated laterallr'. Thorax all over

hairl', strongly so along notauli. Sternauli rug()se. Prol;odeum r.ugose with indistinct areolation. Gaster as long as thorax*head.

Ent.

Tidshr.95.

1974.

3-4

Terebra nearly half as long as gilstel.. Irot.c rving see fig. I

C.

d. Unknorvn.

Length: 2.8-3.0 mm.

Holotvpe: in coll. rnea, 'I'orne Lappnrark, Abisko, 918 1972, leg. I). G. Svensson, col- Iected in rrests of Rombus lopponictrs F.

Palatlpe: 2 Q (in coll. mea)

f

ronr the sanre localitt' as holotvpe.

IJlqcus nidicola sp.n. belongs to the e.rilis

group (see Haeselbarth 1973) and is similar

to lJlcrctrs tobiae Haeselb. but differs

as

follorvs: Terebra is longer, nervulus nret,t discoideus before the middle, the shape of prollodeum is more rounded (not cubic

as

in l]. tobiae Haeselb.) and scutellum flat.

Reference

Hlpsrln^lnrn, E. 1973. Die /l/rrcus-Arten Europns und Zentral-Asiens.

- \'eriiff. zool. StSamntl.

lliinch. l(i:69-170.

(2)

A NEW SPECIES OF BLACUS NEES COLLECTED IN NESTS OF BOMBUS 185

Fig. 7. Blacus nidicoltt sp.n. ?. - .{. Head in frontal vieu'. B. Head in

lateral vielr'. C. Fore u'ing. D. Antenna.

i!￨￨「

ど″′ア

'Jsi′

,5・ゴ,74・

3-`

References

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