3. CHRYSOPS 437 



tip of the upper basal cell which is connected with a larger sloping space 

 which almost includes the tip of the second basal cell ; the large apical 

 clear space occupying most of the apical half (though not including the 

 tij)) of the submarginal cell, though really the only truly hyaline part of 

 this cell is an almost oval spot above the base of the cubital fork of which 

 the basal margin begins just before the fork, then lower down the blackish 

 margin retreats in the first posterior cell towards the base of the wing (so 

 that the outer half of that cell is hyaline) and then descends almost per- 

 pendicularly 'across the third posterior cell but jndistinctly widens out towards 

 the lower outer corner of that cell ; the cubital fork-cell is almost hyaline 

 except for an indistinct darkening about its upper outer corner, so that the 

 subhyaline space in the cubital fork-cell and in three cells below it forms 

 a large space with a slightly concave inner margin ; the darkened space 

 which includes both ends of the discal cell extends downwards and 

 includes (though rather diluted at the tip) all the fourth posterior cell and 

 all the base of the postical fork-cell, leaving the apical lialf of the postical 

 fork-cell less darkened, and after that the whole hind angle of the wing 

 (including the whole of the anal and axillary cells) also less darkened. 

 Squamse (alar) small and smoky blackish with a short coarse scaly fringe ; 

 thoracal pair brownish black and with scarcely any fringe. Halteres blackish. 



? . Also entirely black, but usually with some dark tawny or greyish pubescence. 

 Frons at its narrowest part occupying nearly one-third of the head, all black 

 and moderately shining, depressed across the middle because the ocellar 

 triangle above and the large frontal callus below are rather elevated ; the large 

 callus quite bare and with an arched upper margin, but the depressed part 

 with slight dark tawny or blackish pubescence, and the upper part of the 

 frons with moderate tawny or blackish pubescence ; just above the antennae 

 a doubly lunate band of brownish orange dust extends completely 

 round the antennae and for its full width to the eyes, and is connected 

 beneath the antennae with the similarly brownish orange middle line down 

 the face ; on the face there is a small spot of similar dust just about the lower 

 edge of the pit on each side, but otherwise the shining black calli occupy all 

 the face and jowls except on a very narrow brownish orange eyemargin ; 

 pubescence on the face rather slight and usually rusty 

 black or grey, but becoming longer and more orange or 

 grey about the mouthmargin and the base of the palpi ; 

 back of the head only moderately and equally inflated all 

 the way up, dull black with some short black ciliation 

 near (but not on) the eyemargin, and with some rather 

 longer black or rusty black or brownish yellow hairs 

 behind the top corners of the eyes and behind the vertex. 

 Eyes (fig. 249) in life brilliant green or blue green with only 

 three distinct purplish spots and sometimes a faint one 

 higher up, but with a distinct shifting coppery tinge on fio. 2iQ.—chrysops 

 the forepart from any point of view ; the hindmargin not Left*eye'iii iFfe 

 darkened at all ; the middle spot small but extending 

 downwards at its back part ; the two foi'emarginal spots considerably larger 

 and more rounded, and the upper spot placed just half-way down the eye 

 but slightly above the isolated middle spot, while the lower spot is rather 

 high up and is only separated from the upper spot by about its own 

 diameter ; the three spots form an equilateral triangle. Antennae as in the 

 male, but the hairs on the two basal joints shorter. 



Thorax and scutellum more shining black than in the male, and with 

 very indistinct stripes down the thorax ; pubescence more depressed, 

 brownish yellow or brownish grey on the disc, becoming denser and dark 

 tawny or greyish on both sides of the dorsopleural suture but with a narrow 

 line of black hairs along that suture, and these black hairs usually increase 

 into a clumi^ just in front of the wing-base ; pleurae with a large dense clump 

 of rather long dark tawny or greyish hairs on the back part of the mesopleurae, 

 and with a similar clump on the metapleurae. 



Abdomen moderately shining black ; pubescence tawny or yellowish grey 

 or even almost whitish on the hindmargins of the segments, and in good 



