﻿652 Prof. Mario Bezzi's Rej)ort on a Collection of 



black legs, the tibiae more spiuose 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.sisyplins, 

 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 jjosterior cell is 



very sinuous, oblique and almost of equal length with that 

 dividing the same cell from the third posterior cell ; wings 

 witli 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 



nigrqiennis, 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 



thyrido2jhora, sp. n. 

 G (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. HyiKvalonia 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- 



