22 Mr. E. E. Austen on new 



border, blackish clove- brovTn area at base of wing includes 

 extreme base, proximal tliree-fourtlis of first basal cell, 

 proximal three-filths of second basal (distal border of 

 proximal dark area in basal cells thus runs obliquely for- 

 wards), and base of marginal cell; basal dark area joins 

 proximal edge of transverse band in marginal cell, above 

 point of origin of third longitudinal vein, whence proximal 

 edge of band passes straight across tips of both basal cells, 

 just touching proximal angle of discal cell, and so filling 

 extreme distal extremities of basal cells with dark colour; 

 proximal edge of transverse band touches proximal basal 

 angle of fifth posterior cell, and dies away in narrow, distal 

 extremity of anal cell ; starting from costal border not quite 

 midway between distal extremity of stigma and tip of second 

 longitudinal vein, distal edge of transverse band forms a 

 coufipicuous angle iupex of which rests on base of anterior 

 branch of third longitudinal vein), then runs backwards 

 towards base of wing and crosses main stem of third longi- 

 tudinal vein about 0*5 mm, before its bifurcation ; from tliis 

 point distal edge of band passes somewhat obliquely across 

 wing to proximal boundary of third posterior cell, aflcr which 

 it becomes indistinct; the band fills proximal two-thirds of 

 fourth and fifth posterior cells, and then dies away towards 

 hind margin of wing ; portion of fifth longitudinal vein 

 forming part of boundary of second basal cell bordered 

 anteriorly with blackish clove-brown. Squama sepia- 

 coloured, border darker. Halteres clove-brown. Legs 

 clothed with blaclsish hair, none of the tibia? incrassate. 



Madagascar : Ambohimitombo Forest (Dr. C. I. Forsyth 

 Major). 



In Chrysops insulensis the shape of the transverse band on 

 the wing resembles that seen in C. aprugna ; apart from all 

 other characters, however, the present species may be distin- 

 guished from the foregoing by the fact that the apex of the 

 angle on the distal niargiu of the band rests on the base of 

 the anterior branch of the third longitudinal vein, instead 

 of being separated from it by a considerable interval. Other 

 distinctive characters of 6. insulensis as compared with 

 C. aprugna are afforded by the much darker coloration of 

 the wing-markin-s, l)y the much greater extent of the dark 

 area at the jjroximal ind of the basal cells, and by the legs 

 being entirely black. From C. niadagascaren.sis, Ricardo, 

 as well as from the new sjjecics described below, ('. insulensis 

 is distinguishable at once by the distal margin of the 

 transverse b:»nd being conspicuously angulate instead of 

 nearly uniformly curved, '\^'hen compared with the following 



