20 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62, 
Martin added one species in his Monograph, viz, saltatriz. 
Ris described a new species demeter from Borneo (1911). 
The same author made an important faunistic contribution to our 
knowledge of the genus in 1913 in his paper on ‘‘ Nova Guinea,”’ in 
which he characterizes two new species from north Celebes, nausicaa, 
and penelope, and gives useful figures of the anal appendages of the 
males of these and of certain other species. In addition japonica 
Bartenef must be regarded as belonging to our fauna; Ris has re- 
corded it from Formosa (1916), and remarks that it is the species 
which was formerly recorded from Japan as rosenbergi. Lastly Fraser 
has recently described a new species millardi from India, but I have 
not yet seen his account. So that our list is a fairly long one, includ- 
ing some 16 names. 
I have been able to examine specimens of the undermentioned 
forms: hyalina, basiguttata, khasiaca, bayadera, dohrni, saltatrix, and 
millardi. 
Summarizing the distribution of the species of the genus we may 
say that a considerable number of species are apparently restricted 
to the more equatorial parts of the region especially to the great 
Malay Islands, a few are restricted to the northern half, and a cer- 
tain number range over at least a large part of the whole area. 
Southern India and Ceylon are very imperfectly known. Kirby ° 
reports subinterrupta and furcata for Ceylon but the latter must, I 
think, be a mistaken determination. The genus is in some respects 
the most specialized of all the Aeschnines; it is so far as 1 know 
the only Odonate genus that is definitely crepuscular in its habits. 
Physiologically it seems to differ from other dragonflies in that dead 
specimens are particularly liable to “‘grease’’ and lose their coloring 
to a greater extent than any others. The anal appendages of the 
females are rarely preserved intact in collected specimens. Major 
Fraser tells me that they often have the appearance of having been 
nibbled off, but most probably they are damaged either during copu- 
lation or in oviposition. They do not so far as I know resemble 
except in a general way those of the male, and are usually stalked 
and lanceolate. 
The coloring when well preserved is soft and beautiful, of such a 
nature as to conceal the insect very effectually when at rest on foli- 
age. (G@ynacantha is the only genus of Aeshnines that is definitely 
holotropical, not extending to more temperate climates (except for 
G. Japonica). 
GYNACANTHA MILLARDI Fraser.0 
The most distinct, and also the latest species to be described is 
millqrdi. It differs from all its Asiatic congeners, and resembles 
9 Kirby, Journ. Linn. Soc. London, vol. 34, 1893, p. 558. 
10 Gynacantha millardi Fraser, Journ. Bombay Nat. Hist. Soc., vol. 27, p. 147. 
