Genera and Si>ecies 0/ T;ibaiuda\ 21 



in C. apruyna, and its distal marf^iu convex towards the tip 

 of the wing:, instead of irreguhir and eniarginate below uu 

 angnlar |)rojection in the first snbiuarginal cell ; the tibia?, 

 too, in C. niuddt/uscarenxis are entirely black. Apart from 

 other characters, C'.ajjru//na is distinguishable from C. Uuijdi 

 by the antennie being entirely black, instead of having the 

 first joint ochraceous, as also by the coloration of the wing- 

 markings and shape of' the transverse band. The distinctive 

 characters of C apru(jna as regards the following species 

 are pointed out at the end of the description of the latter. 



Chrysops insulensis, sp. n. 



? . — Length (1 specimen) 6'5 mm. ; width of head 2 mm.; 

 width of front at vertex just under 1 mm. ; length of wiug 

 7 mm. 



Antenna, body, and leys entirely blade ; wings nearly 

 hyaline, base, costal border, both basal cells ejcceyt an area 

 just before their distal eortremities [much larger in second than 

 in Jirst basal cell), and a very conspicuous transverse band 

 across middle {sharply defined except at posterior extremity) 

 blackish clove-brown ; leys slender. 



Head black ; frontal callus, a large, cordate, facial tubercle 

 occupying practically whole of face, and an inconspicuous 

 spot below each eye shining black; ocellar spot shining 

 black (in denuded specimen}, broadly connected with frontal 

 callus by a clove-brown area, which encircles frontal callus 

 and extends a little way below it, connecting bases of au- 

 tenme ; frontal callus roughly elliptical oval in outline, 

 almost reaching eye on each side, its transverse diameter the 

 longer ; sides of front and of face narrowly brownish raw- 

 sienna-colourcd poUinose, joAvls (except shining spot below 

 each eye), a small spot on each side of vertex next upper 

 angle of each eye, and a narrow transverse band immedi- 

 ately below antenuse clothed ^vith similarly coloured pollen ; 

 basioccipital region brownish poUinose; ^-»a//>i black, ter- 

 minal joint lanceolate in outline when head is viewed in 

 profile, clothed on outer side with brownish pollen and short, 

 blackish hair ; antenna of moderate length, first joint 

 swollen, first and second joints clothed with blackish hair. 

 Thorax : pleurie and sides of dorsum brownish jjoilinose. 

 Winys : blackish clove-brown costal border including costal 

 cells and extending from base to just beyond distal extremity 

 of anterior branch of third longitudinal vein, emarginate 

 (and therefore narrower than elsewhere) in marginal cell, 

 next distal edge of transverse band ; in addition to costal 



