232 Mr. W. F. Kirby on some 
1. Pertthemis domitia. 
Libellula domitia, Drury, Ill. Ex. Ent. ii. t. xlv. fig. 4 (1782). 
Exp. al. 36-38 millim. 
Head yellow, browner behind; thorax and abdomen choco- 
late-coloured, thorax with broad olive-green shoulder-stripes, 
and the sides entirely olive-green except narrow stripes on 
the sutures; abdomen with a narrow stripe on each side of 
the dorsal carina and a broad one on each side of the lateral 
carinee, all these interrupted by the sutures ; wings with six or 
seven antenodal and from four to six postnodal cross nervures, 
the last antenodal and first two postnodals not normally con- 
tinuous; hind wings with five antenodal and four or five 
postnodal cross nervures, the two first postnodals not con- 
tinuous; pterostigma reddish, between black nervures, tri- 
angles free, followed by two rows of posttriangular cells, 
increasing ; subtriangular space consisting of two cells divided 
by a perpendicular nervure: wings in the male transparent 
yellow, the centres of the cells mostly lighter; in the female 
the yellow colour extends along the costa to the pterostigma, 
but otherwise ceases a little beyond the nodus, leaving the 
rest of the wings transparent except a small brown spot at 
the tips of the hind wings. 
2. Perithemis pocahontas, sp. n. 
Exp. al. 40 millim. 
Female.—Intermediate between P. domitia, Dru., and P. 
thais, Kirb.; colour and neuration of the former, but the 
yellow on the costa ceases two cells before the pterostigma on 
the fore wings and one cell before on the hind wings; there 
is a brown blotch above and partly covering the triangles; a 
brown border, most distinct on the hind wings, runs down 
below the nodus at the extremity of the yellow portion of the 
wings ; there is a brown spot towards the anal angle of the 
hind wings, and the hind wings are much more largely tipped 
ith brown; the pterostigma, too, appears to be longer on 
the hind wings than on the fore wings. 
I hesitated at first to describe this insect; but it seems to 
be sufficiently distinct to rank as a species. ‘There are pro- 
bably several closely allied species of this group, and it is not 
impossible that this insect may prove to be the female of the 
true domitia of Drury, the typical figure of which is rather 
larger than the specimens which I have described above under 
that name. 
