-80 H. A. HAGEN. 



tral suture ; the posterior border of the edges is oblique, but on secrments 6 to 8 

 with a rounded lobe before tip; on 9th the edges are as long as segment 10 and 

 close to it ; the segment 10 on each side with a short, blunt, apical protraction ; 

 dorsal hooks on segments 2 to 10, but varying much in size and elevation ; on the 

 last 2 to 4 segments they are often represented by a more or less strong median 

 ridge, though the basal segments have mostly very strong hooks; scars in the 

 middle of segments, the dorsal part between the scars lancet shaped and slowly 

 higher towards the middle (about 4 mm.), the marginal part of the abdomen out- 

 side the sears about 1 mm. thick; venter flat; the two longitudinal sutures par- 

 allel, divergent on segments 2 and 9, ending externally of the apical angles of 

 9th ; middle space about half as broad as the laterals ; stigmata near the middle 

 of base of lateral spaces on 2 to 8 are very small, but larger on 8th ; ventral bags 

 triangular, on base of segments 4 to fi somewhat externally of the stigma; genitals 

 marked; the whole margin around the abdomen edged with a fringe of scales; 

 anal appendages short, stout, pyramidal, blunt, a little longer than 10th segment, 

 superior somewhat shorter, channeled at sides, lateral very small, half as long as 

 the others; legs long, flat, slender, formed for running; legs widely distant, mid- 

 dle ones more separated at base than forelegs; a sharp, elevated, transversal ridge 

 on each side with a strong spine on the prosternum and the mesosternu-m, and a 

 triangular hook on the under side of the coxa of the four anterior legs; forelegs 

 shortest, edged with flat scales, femora flattened, tibife angular, longer than femora, 

 tarsi less than half as long as tibiae; middle legs a little longer than forelegs: hind 

 legs very long, much longer than abdomen, femora reaching 7th segment; tibiae 

 a little shorter; tarsi half as long as tibia, third joint as long as the two basal; 

 claws long sharp, less arcuate than on the other legs. 



H7. Hagenius japonicus (su])position). 



Selys Monogr. Gomphi. p. 244; Cabot p. 10, No. 13, pi. iii, fig. 5. 



One male nympha not full grown, dry, from Kanagawa, Japan, by 

 Mr. Gulick. Length 28 mm. 



Very similar to H. brevistylint, differs as follows : part between the antennse less 

 notched, inserted tubercle ovoid, third joint of antennse less rounded, more angu- 

 lar externally ; tubercles on occiput and hind legs blunt, very much less elevated ; 

 the sides of prothorax more blunt; abdomen straighter at sides and behind, more 

 oblong, 9th segment shorter, its lateral angles not so sharp; dorsal hooks less de- 

 veloped, after 5th segment forming an elevated ridge; anal appendages shorter, 

 sharper, superior not so deeply channeled at sides, before tip (which is not broken 

 as presumed in Cabot's description) two very small polished tubercles ; laterals one- 

 third as long as inferiors ; ridges on prosternum and mesosternum ; its lateral 

 spines and the hooks of coxa nearly wanting. 



Though this species is very similar to H. brevisti/lns, the diiferences 

 quoted seem to justify the separation. The doubt of De Selys (Odonates 

 du Japon, 1883, p. 115) about the existence of H. Japonicus in Japan, 

 because he had not seen specimens in the collections from Japan except 

 the type is apparently to be dismissed as the described nympha is surely 

 from Japan. 



