Explanation of Plate X. 



(Figures of details diversely enlarged.) 



Fig. la, to Id. Ichthybotus Hudsoni:—a and &, neuration of base of 

 disk and pterostigmatic region of fore-wing : c, legs 

 of imago, 1, 2, 3 (J and i $ , with tarsus 2 and claws 

 1 of c? more enlarged : d, ventral view of part of 

 the extremity of the ^ abdomen showing one 

 forceps-limb and in stippled outline the median 

 and part of an outer caudal seta. 



2aand26. AkdophleUaversicolor:— a, iore-wmgoi ^ subimago : 

 &, penis from beneath. 



3. . . A. dentata :—tinteriov portion of fore- wing of ^ 

 imago. 



4a!ind.ib.DeleaUdium Lilln:—a, forceps of S ™ago ^^o™ 

 beneath : h, penis from the side. 



5 . . . Ameletus ornatus (?) :— fore-wing of $ subimago. 



6a . . Oniscigasiermiermec^Mts:— posterior dorsal segments 



of $ imago. 

 66 and 6c. 0. distans:—b, posterior abdominal segments of ? 

 imago, from the side : c, ventral markings of 4th 

 and 5th abdominal segments of ^ subimago. 



