BR, J I'NI NAI HIST., 13: 2001 



223 



Posterior fork wilh anterior branch slightly interrupted at base. Costa ends at tip oj 

 R 5 before wing lip. Haltere yellow. 



Abdomen mainly yellow with apical (medially narrowed) brown band on tergites 

 I 4, tergite 5 with the brown band extended towards lore margin medially: tergite 6 

 with brown basal band. Stcrnitcs yellow, with brown markings laterally on sternites 

 5 6. Genitalia (Figs 18 20) yellow wilh appendages brown; gonostylus broad 

 basally, with slender blunt ended apical process. 



Wing length 3.6 3.8 mm. 



Female. Very similar to male, but antenna relatively shorter, distinctly shorter 

 than mesoscutum. Abdomen with tergites 1—5 with a narrow apical brown band; 

 sternites 6-7 sometimes with a brown patch laterally. Ovipositor (Fig. 22) yellow. 

 Wing length 4.3 4.4 mm. 



Holotype male, SWITZERLAND, Ticino, Bolle di Magadino. 16 20.vi.1995. B. 

 Merz & G. Biichli, deposited in ETHZ. 



Paratypes: 1 male, data as holotype; 3 males, 1 female. JERSEY. La Mielle de 

 Morville, Malaise trap catch till 16.x. 1993; 6 males. JERSEY. Waterworks Valley. St 

 Laurence, Malaise trap catches till 21 .vii. 1993; 2 males, 1 female, till 28.viii.1994; 1 

 male, till 8.x. 1994 (all A. Warne, in author's collection and pairs deposited in BMNH 

 and NMS). 



Other material: 1 male, CZECH REPUBLIC, N. Moravia, Olomouc-Cernovir. 12. 

 vii. 1958, P. Lauterer, MNHN. 



Etymology. Named for the late Loic Matile to acknowledge his contribution to 

 knowledge of the Afrotropical fauna of fungus gnats. 



-5^ 



Figs 21-22. Female genitalia of Clastobasis species, lateral view. 21. C. alternans (Winnertz); 



C. loici sp. n.. Scale line 0.2 mm. 



