114 JOURNAL, BOMBAY NATURAL HIST, SOCIETY, Vol. XX VII, 
Type. Anax formosus, Van der Lind. 
1. Anax immacuiifrons, Ramb. Ins. Neur., p. 189 (1842); Brauer, 
Reise d Novara, Neur, p. 60 (1866); Kirby, Cat. Odon., p. 84 (1890) ; 
Martin, Cat. Coll. Selys, Aeschnines, xix, xx, p. 18, fig. 12 (1909) ; 
id., Bull. Soc. Ent. Frn. xii, p. 212 (1909); Ris, Suppl. Ent. No. 
v, pp. 63-65 (1916); Laid. Rec. Ind., Mus. MS (1921). 
Male Abdomen 59 mm., Hindwing 57 mm. 
Female Abdomen 57 mm., Hindwing 58 mm. 
Male—Head large and globular; eyes a beautiful sea-blue during life, 
broadly contiguous; labium, labrum, epistome, frons and vesicle all pale 
bluish green, unmarked ; occiput green or bluish green. 
Prothorax brown, completely hidden by the overhanging head. 
Thorax bulky, matt green on front and dorsum, bright, glossy sky-blue on 
the sides, which are marked with two jet black stripes, an anterior narrow and 
a median, oblique broad, both somewhat sinuous. The tergum spotted with 
blue in the form of a cross. 
Wings hyaline, more commonly enfumed and often tinted with yellow for 
a great part of their area, membrane large, black with a large, basal, white spot ; 
reticulation close, black but many of the nervures at the base of wing, inclu- 
ding the lower half of arc and the antenodal nervures of the 2nd series pale 
yellow ; costa yellow ; antenodal nervures to the forewing 19 to 21, postnodals 
10 to 12, antenodal nervures to hindwing 15, postnodals 12 to 14; trigones in 
forewing with 6 cells, in bindwing 5; 5 cubital nervures in the forewing, 4 in 
the hind; 4 to 5 rows of cells between 5 and 5a; stigma braced, narrow and 
long, dark brown above, paler beneath. 
Abdomen tumid at the base, a little constricted at base of 3rd segment, 
cylindrical and of even width afterwards as far as the ana] end. First segment 
black, 2nd and 3rd sky-blue on the dorsum and sides, the former with a broad, 
transverse, subbasal, black band broadest on the dorsum and an apical, black 
ring which extends squarely basalwards along the dorsum but is not usually 
confluent with the subbasal mark ; remaining segments a dirty pale blue or 
pale yellow with the apical halves or more, black and a small, triangular, dorsal 
black mark on the paler area which is tho analogue of the larger marking seen 
on the 2nd segment ; on the 8th segment, the apical black more extensive and 
on 9 and 10 the black covers the whole of dorsum, tho sides and the apical border 
of the 10th segment yellowish. 
Legs black, robust, long. On the outer side of the hind femora at the distal 
end, a robust, bifid spur is seen which is less marked on the other femora. 
Anal superior appendages brown; seen from above they are narrow at the 
base, then broadening rather abruptly and widely on the inner side and tapering 
again gradually to the apex which is rather obtuse, bevelled outwardly to a 
fine point. A prominent keel runs the length of the upper surface along the 
outer border. Inferior appendages barely balf the length of the superior, 
broadly triangular and strongly curved in profile. (Fig. 3, V). 
Female.—Head: labium, labrum, epistome and frons pale yellowish green 
and unmarked save for a narrow black bordering to the lips; eyes pale bluish 
green, greenish yellow below ; occiput pale olivaceous. 
Thorax sap green on the dorsum, pale greenish yellow on the sides which 
are marked with a narrow, sinuous, black, posthumeral stripe and a broad, 
pale brown or darker brown, median stripe which is bordered narrowly in front 
and behind with black. The metepimeron bordered posteriorly, narrowly 
with black. 
Wings hyaline, their attachments to the thorax ashy ; other features as in 
male. 
