522 ON DRAGONFLIES FROM SOMALI-LAND. [Apr. 21, 
powmt or very short stalk ; triangle traversed, 3 rows of post-trian- 
gular cells increasing; 3 cells in the subtriangular space; one 
cross-nervure in the lower basal cell ; no supratriangular nervules. 
Hind wings with the base of the triangle ona level with the arculus ; 
pterostigma yellow, between thick black nervures. 
This species much resembles O. cwrulescens, Fabr., and, O. subfas- 
ciolatum, Brauer; but the almost unstalked sectors of the arculus on 
the fore wings remove it from anv of the allied species. It is, how- 
ever, an Orthetrum in its essential characters, and, except in this one 
particular, exhibits no resemblance to Leptetrum. It is curious 
that of the three new species in the present small collection, none 
seem to agree exactly with the described genera; and as I am 
unwilling to establish new genera on single specimens, I place them 
provisionally in Orthetrum, to which they seem perhaps most 
nearly allied. 
4. ORTHETRUM PHILLIPSI, sp. n. 
Long. corp. 35 millim.; exp. al. 51 millim.; long. pter. 2-2-3 
millim. 
Male. Head greenish, the frontal tubercle darker, and the adja- 
cent parts of the upper orbits, as well as the occipital triangle, 
black ; occiput black above, yellow beneath. Thorax and abdomen 
wholly pulverulent blue, the sutures and carine lined with black, 
and the front of the mesothorax with incomplete black shoulder- 
stripes. Abdomen rather slender, moderately inflated at the base. 
Legs black ; the front legs yellowish on the outside, the others with 
the coxe and a stripe on the femora yellowish. Lower anal ap- 
pendage fully 2 as long as the upper ones. Wings narrower than 
in the last species, clear hyaline, the base stained with yellow, 
especially on the hind wings; membranule white, not bordered 
with blackish below. Neuration and pterostigma coloured as in 
the last species; nodal sector and space between the nodal and 
subnodal sectors similar. Fore wings with 11 antenodal cross- 
nervures, the last continuous, and 8 postnodals, the first two at 
least not continuous; sectors of the arculus distinctly stalked ; 
triangle traversed, 3 rows of post-triangular cells increasing ; 
3 cells in the subtriangular space ; one supratriangular nervule. 
Hind wings with the base of the triangle distinctly within the level 
of the arculus. 
An unusually slender species, much resembling the last super- 
ficially, but very distinct. 
Dobar, Goolis Mountains, Feb. 4, 1895. 
5. ORTHETRUM LORTI, sp. n. 
Long. corp. 32 millim. ; exp. al. 55 millim.; long. pter. 4 millim. 
Female. Head greenish yellow, the mouth and lower parts darker. 
Thorax greenish yellow, with a yellowish-white stripe on each 
shoulder, bordered below by a darker greenish-brown space than 
the rest of the coloration. Abdomen moderately short and 
broad, tawny, with a black central carina commencing on the 
