1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 133 



Hagen's subsequent illness has prevented me from seeking further aid 

 from him. In my report on the Odonata collected by the United States 

 Eclipse Exj)edition to the Congo, I described a species under the name 

 of capensis. I am now doubtful whether it is distinct from the present 

 si^ecies, but the specimen is no longer before me.' 



ORTHETRUM ABBOTTII, new species. 



Wings hyaline, reticulation brownish, costa and some cross veins 

 near base, yellowish; an extremely small fulvous cloud at base of the 

 lojig veins; pterostigma yellow, its veins black, surn;iounting 2-3 cells; 

 membranule whitish, darker on its free border. Front wings with 

 12-13 antecubitals, 9-10 postcubitals, one hypertrigonal; median cross 

 vein more distant than first autecubital. Hind wings with 10 ante- 

 cubitals, 9-10 postcubitals, no hypertrigonals, median cross vein nearer 

 than the first autecubital; sectors of the triangle distinctly separated 

 at their origins. Three rows of posttriangular cells in all four wings. 



Male. — Vertex black, apex truncated. Frons, uasus, and rhinarium 

 pale green; frons darker anteriorly between the two vertical carinae 

 and at the middle of the upper surface. A black line in front of the 

 eyes. Lips yellow. Occiput black, rear of head yellow. 



Prothorax pruinose, its hind margin slightly bilobed. 



Thorax pruinose, median dorsal carina black; an oblique greenish 

 yellow band on the sides just behind the spiracle followed by a black 

 oblique band at the second lateral suture; posterior to this latter band 

 the color is light green; latero-veutral metathoracic carina greenish. 



Abdomen rather slender ; viewed from above, base moderately inflated, 

 becoming narrower to the base of 3, thence widening to 6, thence nar- 

 rowing to apex; black, pruinose, some pale spots on the sides of 1, 2, 

 and base of 3. 



Superior appendages not as long as the last two segments, black, 

 slender, straight, denticulated below, apices moderately acute. Inferior 

 appendage one-fourth shorter, obscure luteous, edged with black, rather 

 broad, its apex broad (one-third of length), rounded when viewed from 

 below, ending in two denticles directed upward, not reaching as far 

 as the last denticle of the lower side of the superiors. 



Genitalia of 2 prominent. Anterior lamina more prominent than 

 any other piece, swollen anteriorly when viewed in profile, the swollen 

 portion covered with minute denticles; apex distinctly emarginate 



' One male of the lot of hrachiale from Kilimanjaro has the following imperfections 

 in structure: The left hamule is normal, hut the right hnmule is entirely ■wanting, 

 apparently not having developed. The anterior lamina is apparently represented 

 only by a tubercle, better developed on the right side, and not ])rojecting as far as 

 the level of the point of bifurcation of the left hamule. The left superior appendage 

 is normal, but the right one is nearly a third shorter, although with the same acute 

 apex as these appendages normally have, and bears no inferior denticles. The left 

 lateral margin of 8 is dilated as in the female, and there is a rudiment of a sianiilar 

 dilatation on the right side. In all other particulars this male seems to be normal. 



