652 Prof. Mario Bezzi’s Report on a Collection of 
black legs, the tibiae more spinose and with longer spines, 
the hind claws with an obtuse tooth which it is often very 
difficult to see; the wings are hyaline or with much less 
developed markings. The discal cell is not twisted, in the 
shape of a trapezium, and the vein dividing it from the 
second posterior cell is straight and almost perpendicular 
to the longitudinal axis of the wing; second posterior cell 
broader at apex than at base. The species are H. sisyphus, 
Fabr., from Guinea; alula, Bezzi, from Erythraea; and 
perhaps monacha, Klug, from Arabia. 
The species in the collection can be distinguished as 
follows :— 
1 (6). The vein dividing the discal from the second posterior cell is 
very sinuous, oblique and almost of equal length with that 
dividing the same cell from the third posterior cell; wings 
with extensive black markings or all darkened. 
2 (5). Wings entirely darkened or blackish; second basal cell with 
a very small whitish spot in the upper corner, which often 
is very indistinct. 
3 (4). Head, abdomen, basal joints of the antennae and legs red, 
wings brown, with the cross-veins shaded .  vittata, Ric. 
4 (3), Head, abdomen, antennae and legs black; wings blackish, 
with the cross-veins not distinctly shaded 
nigripennis, Loew. 
5 (2). Wings broadly hyaline at apex and towards the axillar cell ; 
second basal cell with a very large subquadrate hyaline 
spot, which extends over almost all its apical half 
thyridophora, sp. n. 
6 (1). The vein dividing the discal from the second posterior cell is 
straight, almost perpendicular, and very much shorter than 
that dividing the same cell from the third posterior cell ; 
wings entirely hyaline, with a narrow brown fore border 
along the costal cell. - : : sisyphus, Fab, 
75. Hyperalonia vittata, Ricardo (1901). 
Ten specimens of this species, which seems to be 
common in Central Africa; they agree very well with the 
description of Miss Ricardo, and one was besides compared 
with the type by Mr. E. E. Austen. The great variation 
in size of this species has already been mentioned by Miss 
Ricardo ; of the specimens here recorded, the largest 
measures 19 mm. in length of the body and about 40 mm. 
in wing-expanse ; the smallest 11 mm. and 24 mm. respec- 
