.u;t. 10. DltACONFLIES OF GENUS ACIAGIUON LAIDLAW. 7 



" VeiT conspicuous thou<i,-h suiaJl, l>y reajson oi the l)ri<i!;ht lilue 

 color, and can easily be picked out from the more somber Imopa with 

 v.liich they mix." (Fraser.) 



ACIAGRION BORNEENSE Ris. 

 Plate 1. figs. 10, 12, 13. 



Ackijihou, homeense Itis. Ann. Sor. Entoniol. Belgitjue, vol. 55, 1911, pp. 234- 

 235, figs. 2 and 3. 



Specimens e.ramhied. — Eight males and seven females, collected 

 1)y W, L. Abbott, Trong, Lower Siam (collection of the United States 

 National Museum). I have also seen specimens from the Malay 

 State. 



Tliis is the snnillest species of the genus. The female has not been 

 described; it is similar in coloring to the male save that segments 8 

 and of the abdomen have- a longitudinal band covering the whole of 

 tlie dorsum of these segments, whilst the tenth has a basal, bilobed 

 black mark. 



Tlie type specimen (from Borneo) is said to have the ninth seg- 

 ment of the abdomen entirely sky-blue. Two of the males from 

 Trong lun'e a small, diamond-shaped, black mark on the dorsum of 

 this segment. I lune figured one of these specimens. The anal ap- 

 pendages have l)een figured by Ris; they are very similar to those of 

 A. occidextalc. 



Tlie apex of the third segmeut of the penis is cornuate; the spur- 

 like projections of the lateral margins are small and lie far back from 

 the apex; the njost basalh' situated of the denticles of the inner sur- 

 face are enlarged and lie considerably more distad than the lateral 

 projections, and between them and the projections there is a small 

 bilobed swelling. The internal fold is small. 



The species ranges from Borneo through the Malay Peninsula as 

 far north approximately as the Isthmus of Kra. 



ACIAGRION PALLIDUM dc Selys. 

 Plate 1, figs. 1-7, 9. 



AcUtf/rioii paUkluin de Selys, Ann. Mus. Givico cli <ieu<>v;i, vol. .30, 1891, ]i[>. 

 80-Sl (separate). — Laidlaw, Pee. Indian Musenni. vi>l. 10, \h>. 2, 1919. 



Speehnens ed-amined. — Very numerous females and males from 

 Lower Burma, collected by E. A. Earnshaw, in Mr. AVilliamson's 

 <"(d lection. I have seen also specimens from Assam and from peninsu- 

 lar India from the north Kanara District and Nagi)ur. 



As the species is structurally a typical memlier of the genus I have 

 figured certain details of venation, etc.. in some detail. In color- 



