342 triangular; the square median sternite of the mesothorax has an irregular 

 surface; the posterior sternites are narrow and oblong; the median sternite 

 of the metathorax is triangular, with rounded posterior margin; the posterior 

 sternites are rodlike. 



343. 



FIGURES 434-440. Oxyethira costalis Curt, (after Nielsen) : 



434 - thorax, lateral (A) and ventral (B); 435 - pleuron of prothorax; 436 - 

 prosternum; 437 - right foreleg (A) and midleg (B), posterior view; 438 - disto- 

 ventral process of fore tibia, anterior; 439 — segment 9 and right anal leg, 

 outer view, 440 — claw of anal leg, outer and partly ventral view. 



379 



