292 ENTOMOLOGICAL NEWS. [July, ’12 
thirds length is a stout dorsal tooth on the inner (mesial) margin. In 
profile view (Fig. 5) each appendage at its base is almost half as high 
as the hind margin of Io but contracts its height by one half on the 
ventral side of the proximal fifth; at one-half length is a strong tuber- 
cular ventral tooth directed ventrad, distad to this tooth the ventral 
edge is concave; the fourth sixth of the appendage’s length on its 
dorsal edge is occupied by a stout tooth directed dorsad and caudad; 
from this tooth the thickness of the appendage gradually decreases 
to the apex which is obtuse and bent very slightly downward (ventrad). 
Viewed from below, each appendage has a ventral longitudinal carina 
in its proximal sixth and again in its distalf half. 
Inferior appendage shining blackish brown, its hairs fewer and 
shorter than those of the superiors. Viewed in profile (Figs. 5, 8), it 
does not quite attain the level of the inferior tooth of the superiors; it 
is curved strongly dorsad, then cephalad and finally, at its apex, ventrad, 
decreasing gradually in thickness throughout its length. Viewed from 
below (Fig. 7), its width decreases from the base; it is divided into two 
branches from almost the base, the branches closely oppressed 
throughout and forming between them a deep ventral groove. 
Femora dark brown, those of third legs redder, inner (lower) sur- 
face of first femora and a distal spot on inner surface of second pale 
green. Tibiae and tarsi black. 
Q. Differs from the male as follows: Vertex with a deep median 
longitudinal groove on the posterior wall of which is situated the 
median ocellus; as a result, when the head is viewed from in front 
(Fig. 4), the median ocellus is above the level of the two lateral ocelli, 
and in dorsal view (Fig. 3) the median ocellus is completely posterior 
to the level of the other two. In the male, as in most Gomphinae, and 
indeed in Odonata generally, the median ocellus is below and at least 
not posterior to the level of the other two ocelli in these two views 
respectively (Figs. 2, 1). As a further result of the presence of this 
groove, the transverse ridge on the vertex behind the ocelli is produced 
in the middle dorsad and caudad as a marked convexity which con- 
ceals all of the occiput except its hind margin, when the head is 
viewed from in front. Dorsal surface of the occiput very much 
reduced antero-posteriorly, its hind margin strongly convex and fringed 
with dark hairs; posterior surface swollen in the middle, which is 
not the case in the male, and with a distinct socket on each side ad- 
joining the compound eye. Front shallowly and widely grooved an- 
tero-posteriorly in the middle of its superior surface; this feature 
less marked in the male. 
Mid-dorsal mesothoracic carina pale green; brown markings of the 
thorax paler, redder; green antehumeral stripe at mid-height half as 
wide as the brown mid-dorsal stripe. 
