616 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. NX VIII. 
21 antenodal nervures and II postnodals to the forewing, 15 antenodal and 16 
postnodal nervures to the hind. 
Abdomen long and slender, black, the 1st segment with reddish hair, the 2nd 
with a basal, dorsal, yellow triangle, 2 transverse, linear spots of the same colour 
on each side of the dorsal crest at the middle of the segment and at the apical 
■end, segments 3 to 9 with a linear spot of yellow on each side of the dorsal carina 
about the middle of the segment and a larger semilunar spot at the apical end 
nearly confluent across the dorsal carina, 10 unspotted. 
Superior anal appendages long, slender at the base, then broadening spatulate- 
wise after the first third, the apex rounded, brovm. Inferior appendage half as 
long as the superior, triangular. 
Female unknoAvn. It is possible that C. acutifroi^s is the female of C. masoni. 
The venation differs rather widely but this character is so variable a factor that 
too much importance should not be given to it. 
Type male in the Selysian collection. Assam. 
Cephalseschna lugubris, Martin, 110, fig. 103, Syn. Cat. Coll. Selys. 
Alschnines, xix, xx (1908). 
CephaJceschna sikkima, Selys, in. litt. 
Cephalceschna lugubris, Laid., Rec. Ind. Mus., Vol. xxii, p. 78, (1921). 
Male. Length of abdomen 48-51 mm., hindwing 41 mm. 
Head. Labrum, labium and lower epistome yellow, upper epistome green, 
frons in front shiny black, above yellow bordered with black, frons raised and 
narrow ; occiput small, black. 
Thorax short, blackish bro-wn, marked with a green antehumeral band on either 
side of the front and laterally with two broad, green bands. 
I>egs blackish brown, the bases of femora reddish. 
Wings hyaline, tinted with brown ; stigma very short ; brown ; membrane 
yellowish, trigones made up of 4 cells ; anal triangle with 3 cells ; 2 rows of cells 
between the forking of Rs ; 21-25 antenodal nervures and 11 postnodals in the 
forewings, 18-19 antenodals and 13-15 postnodals in the hind. 
.Abdomen long and slender, slightly tumid at the base, a little constricted at 
the 3rd segment, black marked with green as follows : — the 1st segment with a 
central, yellow spot, the 2nd with a dorsal, green line broken at its middle, 
2 linear transvei-se streaks at the centre of the segment, separated by the 
;niddor.sal carina, and finajly an apical, green annule, segments 3 to 8 with, 
similar, central, linear marks and apical ring, segments 9 and 10 unmarked, the 
latter with a prominent, middorsal crest. 
Anal appendages brown, nearly as long as the combined length of the last two 
abdominal segments, very slender at the base, broadly spatulate after the first 
third, the apex with a small spine. Inferior appendage triangular, about two- 
thirds the length of the superiors. 
Female. Very similar to the male but the abdomen shorter and stouter. 
The frons without the black stripe above, the face olivaceous green. The 10th 
abdominal segment very short above. Anal appendages short, very slender 
filiform and pointed at the apex, brown. 
Types in the ctrllections of Martin and Selys. 
Hah. Sikkim. 
Cephalaeschna orbifrons, Selys, Bull. Acad. Belg., (3) v. p. 739 (1883) 
Martin, Cat. Coll. Selys, Aeschniries, xix, xx (1908) ; Laid. Rec. Ind. 
Mus., Vol. xxii, p. 78, (1921). 
]\Iale. Length of abdomen 45 mm., hindwing 40 mm. 
Head : Labrum, labium, epistome and frons uniform olivaceous and quite 
unmarked ; eyes dark olivaceous, broadly contiguous ; occiput small, black. 
Prothorax dark brown bordered finely with yellow'. 
Thorax short but robust, dark brown marked with apple green, an antehumeral 
