Boletina ichnusa, Chandler, 2009

Chandler, Peter J., 2009, The fungus gnats (Diptera: Bolitophilidae, Keroplatidae, Mycetophilidae) of Sardinia, with description of six new species *, Zootaxa 2318 : -

20. Boletina ichnusa sp. nov.

( Figs 11–14)

Type material. Holotype ♂: I-Sardegna (Cagliari), Iglesias Marganai, 700 m, Plot Conecofor SAR1, UTM 32 S 462853 4355582, 17.XII.2004 - 4.I.2005, Malaise trap, G. Chessa legit, Conecofor Programme CNBF ( CNBFVR).

Paratype: 1 ♂: same data as holotype except 18.I-1.III.2005 ( CNBFVR) .

Diagnosis. A small dark species with legs yellow except mid and hind coxae which are mainly dark and a bare laterotergite, differing from other species with these characters by the structure of the male genitalia, the gonocoxites narrowly cleft medially with a pair of short broad ventral apical processes, the gonostylus broad with a short medial setose process and the cerci short and broad, with an apical comb of thickened setae and irregularly distributed setae on basal half.

Description. Male. Head dark brown with dark bristling. Antenna dark brown, twice as long as head and thorax together, with long slender flagellomeres. Palpus yellowish, slender, as long as head.

Thorax dark brown with black bristling on mesonotum and scutellum. Pleura, laterotergite and mediotergite bare. Wing clear, with costa and radial veins brown. Vein Sc ending in costa beyond level of base of Rs. Vein Sc 2 present, at just beyond half length of Sc. Costa extending 0.5 times distance from R 5 to M 1. Vein R 5 divergent from R 1 basally, then parallel with it in median portion and again divergent apically. Crossvein r-m diagonal, about two thirds length of stem of median fork. Veins setulose except for Sc, Sc 2, r-m, tb, A 1, stems of forks and bases of fork veins. Vein A 1 weak, ending just beyond level of base of posterior fork. Haltere yellow. Wing length 3.7–3.9 mm. Legs yellow except for mid and hind coxae which are mostly dark brown but a little paler apically; with short dark irregular setulae, tibiae with irregular rows of weak setae, of length subequal to 1.5 tibial width. Fore metatarsus 0.6 length of its tibia. Tibial spurs long, yellow; fore leg with one spur, mid and hind legs with two spurs.

Abdomen including genitalia brown with short dark bristling. Genitalia ( Figs 11–14) with gonocoxites narrowly cleft medially with a pair of ventral apical processes, which are broad basally, then curved and internally emarginate on apical half; gonostylus broad with a short medial setose process; aedeagus ( Fig. 12) with short preapically geniculate apical lobes. Tergite 9 ( Fig. 13) narrowly articulated with gonocoxites basally; cerci short and broad, with an apical comb of thickened setae and irregularly distributed smaller thickened setae on basal half ( Fig. 14).

Female. Unknown.

Etymology. The ancient name of the island of Sardinia and is a noun in apposition.

Chorotype. Type 6 [3.02 of Vigna Taglianti et al. (1999)]. Mediterranean.

Italian distribution. Sardinia only.

Notes. This species belongs to the Boletina sciarina group, which also includes the other Sardinian species except B. basalis , and many others in the Palaearctic fauna. These are characterised by absence of setae on the laterotergite and the structure of the male genitalia including an undivided gonostylus. Within this group it resembles B. gripha and a few other species in having partly darkened coxae and differs from previously known species in the form of the gonocoxites and gonostylus.