1040 REPORT OF THE HARVARD AFRICAN EXPEDITION 
Tetrathemis camerunensis (Sjéstedt) 
be es Sjéstedt, 1899, Bihang K. Svenska Vet.-Akad. Handlingar, XXV, Af. IV, 
0. 2, p. 36. 
One male, Du River, Liberia, Camp No. 3, August 3, 1926. Differs from the 
original description (loc. cit.) in having the inferior surface of the fore femora 
orange for the proximal half, the black on the sides of the thorax, especially on 
the metepimeron, with a dark metallic green reflection. 
Only on the right hind wing is the arculus at the second antenodal; on the 
other three it is placed at a varying distance (.1-.16 mm.) proximal to the arculus 
and hence does not fall in the key given by Dr. Ris (Catal. Coll. Selys, Libell., 
p. 45, 1909). 
Orthetrum microstigma Ris 
Two females from Gbanga, Liberia, taken by Dr. Joseph Bequaert, numbered 
two and three by him, and on which he found Ceratopogonine midges, as stated 
by him elsewhere in this report (p. 846), appear to belong to Orthetrwm micros- 

ic 
x 
\ . Vill 
: / ; 
( 
Soe NG, ———— ' 
a ae ee) 
a ( ye IX { b 
c c 
c 
Text Figure 25. — Vulvar lamina of Orthetrum microstigma Ris: a, ventral 
view; 6, oblique view, ventrally 
tigma Ris. As the vulvar lamina in none of the specimens described by Dr. Ris 
was ‘“‘ganz deutlich zu sehen”’ and as these Gbanga females differ in some re- 
spects from the description (Revue Zool. Afric., I, 1, p. 129, 1911; reproduced 
in Catal. Colls. Zool. Selys, Libell. p. 1088, 1916), the differences are set down 
here. Both females were preserved in alcohol. 
Female No. 2 (Bequaert). Labium pale olive brown, median lobe blackish, mesal (really 
distal) margin of lateral lobes for their proximal half, and for almost equal width, dark brown. 
Face olive, paler on clypeus and still paler on labrum; no indication of orange on the frons and 
only an extremely fine black line visible on the sides of the latter (= genae) in front of the eyes, 
but not visible in front of the median ocellus. Vertex colored like the frons, its apex divided into 
two obtusely-pointed lobes, when viewed from in front. 
The most elevated part alone of the mid-dorsal thoracic carina blackish, with no dark margins. 
A narrow (.33 mm.) ante-humeral, reddish brown stripe on the lower four-fifths only of the mese- 
pisternum. A subparallel, slightly wider but less defined stripe on the humeral suture. A sharper 
and blacker stripe, .33 mm. wide, on the lower half of the mesepimeron, separated from the metas- 
tigzma by about the width of the stripe itself; a trace of a similar stripe, about .75 mm. long, above 
the metastigma, on the metepisternum. Latero-ventral metepimeral carina sharply black; a 
dark streak on the posterior surface of each third coxa, otherwise no dark ventral markings on the 
thorax. 
