SOME NOTES ON ORIENTAL DRAGONFLIES. 219 
(shown by the “nodal indicator’) ; size, and lastly the shape of the 
anal appendages and of the genital structures of the second ab- 
dominal segment of the maie. 
Probably also the shape of the margin of the hind-wing of 
the male, between the membranule and the anal angle, is of some 
specific value. 
As will be seen from the sequel, the total number of species 
of acromia from the Orient is not less than eighteen; it will pro- 
bably be increased considerably in the future. The Macromias are 
handsome, stron g-flving insects that will repay careful study in the 
field, and the difficulty ‘of capturing some of the species at any rate 
raises their aa almost to the dignity of a sport. Kennedy 
records (Proc. U. Nat. Mus. 49. p. 313, 1915) that he was 
compelled to use a a -cun to obtain his first supply of specimens 
of the American M. magnifica MacL. 
Since the pubheation of Kirby’s Catalogne in 1890 the follow- 
ing are the important notices dealing with members of this genus 
from Indo- -Malaya:— 
1899. Kriiger, L. Stettin entomol. Zeit. pp. 324-338. 
1906. Martin, R. Collect. Zool. Selys. XVII Cordulunae. 
1916. Ris, F. Suppl. Entom. No. 5. pp. 65-71 Taf. in, figs. 1-4 
Text-figs. 42-45. 
References to other papers are given where necessary in the 
Let. 
I. Group of M. westwoodi Selys. 
Segments 2-6 of abdomen unicoloured, all with more or less 
metallic Instre. Front of head uniformly dark brown, but the 
pyramidal processes of the frons metallic green or violet. Males 
with pointed triangular process on the dorsum of the tenth seg- 
ment of the abdomen. Pterostigma small (2 mm. or less). 
a. <A well-defined humeral band of yellow, incomplete above. 
Costal nerve with fine yellow line. ¢ Lower anal appen-: 
dage about equal in length to upper pair. These latter 
are very slightly recurved apically, and have each a very 
small, almost obsolete extero-lateral tooth at about the 
middle of their length. 
Length of hind-wing g 46 mm. (? 50 mm. Selys). 
JM. westwood Selys. 
Perak. Penang. 
a* Lower part of dorsum of synthorax brown, as it passes 
dorsalwards acquiring a metallic green lustre, but no 
definite humeral band present. Costal nerve black. 
b. & Lower anal appendage almost a third as long 
again as upper pair, the latter with apices recurved, 
aR. A. Soc., No. 85, 1922. 
