BR. J. ENT. NAT. HIST., 13: 2001 



Fig. 23. Male of Clastobasis alternans (Winnertz), lateral view. 



Discussion. This species was referred to as an undescribed species in the Swiss 

 checklist (Chandler, 1998b) and its presence in the Czech Republic had been 

 recognised by Petr Lastovka. 



C. loici bears some resemblance in ventral view of its genital structure to the 

 eastern Palaearctic species C. gussakowskii Zaitzev (1994) but a figure of 

 gussakowskii in lateral view; forwarded by A.I. Zaitzev shows clear differences, 

 especially in the form of the gonostylus which is broader with a short apical process 

 without the slender neck. 



C. loici is also very similar except in genital structure to C. alternans. The antennal 

 fiagellum has narrower brown bands, not increasing as much in extent on the apical 

 flagellomeres, all of which are clear yellow basally. The wing venation differs in 

 crossvein r-m being relatively shorter, not much longer than the stem of the median 

 fork and the veins of the fork are more strongly convergent apically. 



