8 PROCIEEDTNGS OF THE NATIONAL MUSEUM. vol. (in. 



ino' paUidv/u is possibly' iiioi-e specialized tliaii other Aciagrion (ex- 

 cept perhaps olympicwn). At any rate it departs more widely in 

 this respect than do most of its congeners from the usual Enallagma 

 pattern. Young specimens are curiously suggestive of Amphicnemis. 

 though there is, I believe, no close relationship. 



As in hisopa the penis has the apex of the third segment truncate 

 and without cornua. It differs from hisopa in that the most basally 

 situated denticles are much enlarged and project backward like barbs 

 l)etwee]i the two large, lateral marginal spurs. 



ACIAGRION OLYMPICUM Laidlaw. 



Plate 1, fig. ]4. 



Aciayrion olyhipicnm 1jA[1)la\v, Eec. Iiulhm Museum, vol. 10, no. 2. 1911X 



pp. 184-186. 



/Specimens exami^ied.—One male (paratype) from Darjiling Dis- 

 trict. 



This is the largest species of the genus so far as I know. Its mark- 

 ings are on the whole similar to those of the most of the species 

 of the genus, save perhaps that in the male the marking on the 

 dorsum of the second segment of the abdomen is reduced to a pen- 

 tagonal or triangular spot. The coloring is however remarkable in 

 that blue is altogether absent, and that the ground color is a fawn or 

 buff. I have not been able to examine the penis. The anal appendages 

 of the male as already noted are similar in plan to those of some of 

 the African species of Africallagma figured by Doctor Ris. 



A. olympicum has been recorded only from the footliills of the 

 Himalaya, near Darjiling. 



The following are the references to the three species I have not liad 

 an opportunity of examining. 



ACIAGRION APPKOXIMANS (de Selys). 



i'f^euddfjrioih mU-roceplialwn (?) rii<-t' approxinians uv: SiorA's, P.v.ll. Acad. 



Belgique, ser. 2, vol. 42, 1876, pp. 507-508. 

 Aciagrion approxlmanft dk Skt-ys, Ann. Mus. Civioo di (ieii-iva. vol. 30. 



1891, p. 80. 



ACIAGRION FRAGILIS (TiUyard). 



/schnura (?) fragilis Tillyard, Proc. Linn. Soc. New South Wales, 1006, pt. 2, 



pp. 186-187, pi. 17, fig. 6. 

 Aciagrion fragilis Tillyard, Proo. Linn. Hoc. New South AV'tilcs, vol. 37. pt. 



3, 1912, p. 472, pi. 46, figs. 21, 22; pi. 49, fig. 22. 



ACIAGRION AZUKEUM Fraser. 



Aciagrion ac^ureum Frarkr, Mein. Dept. Agr. in India, vol. 7, no. 7, 1922, p. 51. 



