FASCICULI MALATENSES 
199 
Sumatra ; and M. semiopacus sub-race ajfinis^ Laidlaw in Kelantan ( ? ,Laid- 
LAW ; $ $ ^ Waterstradt). Karsch compares M. martinae^ Karsch, with 
M. xanthocyaneus from the Celebes. But Karsch ’s species undoubtedly differs 
but slightly from the typical Bornean M. semiopacus^ Selys. In Af. semiopacus 
the dark tips of the fore wings are mm. in length, in TW. martinae^ 5 mm., 
and in M. affinis^ 5|- (Laidlaw), and in Waterstradt specimens only 4 mm. 
In all these forms the dorsal surface of segments 3-5 of the abdomen carries 
a longitudinal rectangular light yellowish spot, which is divided in two by the 
black Carina. In some cases, by an angular encroachment of the black ground 
from the sides, these paired spots are changed into two, 7 set back to back. 
The 7-shaped marks occur in segments 4-5 of M. affinis^ in 3-4 of M, semio- 
pacus (probably also in 5), and very imperfectly in M. martinae. 
Segment 6 is identical in all three, and the light mark projects as a 
rectangle from the anterior margin of the segment. In M, lineatus^ on the 
other hand, it projects as a rhomboid, and in M, stigmatizans nearly as a circle. 
M. martinae is more distinct from the typical form, M. semiopacus^ than 
is M. affinis^ which is very nearly identical with it, since the extent of the 
opaque apical spot of the fore wing is evidently variable, and the darkened tip 
of the fore wing is merely a mark of age. In all three the epistone is metallic 
blue, partially wrinkled. In M. ajjinis the light markings of the abdomen are 
pale green.’] 
The continuance of the black apical mark on the fore wing, right across 
the wing, serves to distinguish these three species at a glance from those of 
the lineatus group. 
My specimens of M. affinis were, to the best of my recollection, pale 
yellow in colour in life, so far as the markings of the abdomen are concerned. 
(See Karsch, Ent. Zeit.^ Berlin, xvii (1891), No. 16, for M. martinae; 
for M, affinis^ see Laidlaw, P.Z.S. 1902 (i), p. 90, pi. vi, fig. 7). 
LEGION AMPHIPTERYX 
21. Devadetta arg^yroides (Selys) 
Devadetta argyroides, Kirby, Cat. Odonata, p. 1 1 1 (1891). 
1^,3$. Bukit Besar, 2,500 feet, Nawngchik. May, 1901. 
I (^ . Mabek, Jalor. July, 1901. 
‘ Flying beside jungle stream.’ 
Two of the female specimens from Bukit Besar where taken ‘ flying in 
the jungle,’ one ‘ in the morning ’ and ‘ early afternoon, before rain.’ The 
male is labelled ‘jungle stream, mid-day.’ One of the females is briefly 
AI 
10/9/03 
