374 TABANID.E 



callus, or (when seen from in front) all more equally pale brownisli orange, 

 slightly contracting from the upper part down to the front eye-angles, and 

 nearly four times as long as its widest part or six times as long as its narrowest 

 part ; lower callus shining black and almost quadrate or even higher than 

 broad and in perfect specimens not absolutely touching the eyes at any part, 

 and connected by a narrow black line with the long narrow black middle 

 callus ; ocellar tubercle conspicuous, shining dark chestnut ; pubescence of 

 the frontal stri^ie (when seen in profile) rather dense, rather short, mixed black 

 and yellow with the yellow hairs thinner but rather predominant, and usually 

 with some hairs sloping forwards and some backwards, while above the ocelli 

 the pubescence is rather longer, curved forward, and all black except for 

 sometimes a few pale hairs close against the occiput ; side-cheeks and jowls 

 with mainly pale yellow silky hairs, which are not so dense or long on the 

 cheeks as is the black bushy pubescence of the male ; there are sometimes a 

 few shorter inconspicuous black hairs near the eyemargin on the upper 

 half (or sometimes more) of the face and sometimes a few inconspicuous 

 black hairs on the upper middle part of the face ; pubescence on the lower 

 part of the jowls and all about the back of the mouth longer and pale yellow, 

 rather dense and conspicuous ; all along l)elow the eyes and up all the back of 

 the head to the vertex is a narrow dull pale yellow bare rim, behind which 

 is a rather short tliough rather crowded ciliation of brownish yellow hairs 

 which only extends to the upper eye-angle • back of the head all light grey 

 and bearing below the vertex some long pale hairs ; frontal triangle bright 

 ashy grey, quite bare but with a distinct middle furrow ; antennal pits rather 

 orange. Palpi (fig. 227) rather pale dull luteous but varying to orange, usually 

 almost obscured by the short dense depressed black bristles amongst which 

 on the basal jiart (especially above) are some less distinct thin smaller pale 

 yellow bristles intermixed, but sometimes the numerous short black bristles 

 are almost confined to the apical two-thirds and occur only sparsely before the 

 middle, while the basal part has only the smaller thin inconspicuous 

 pale yellow bristles ; palpi nearly four times as long as their broadest part, 

 rather broad from the base up to about the middle, after which they droop 

 and gradually diminish to a moderate point, quite bare on all the inner side 

 but with a few longer pale hairs beneath about the base, basal joint 

 blackish grey but covered with greyish orange dust and bearing long pale 

 pubescence, though occasionally with one or two black hairs on the outer 

 side near the tip. Eyes clothed with short dense dark brownish pubescence, 

 which becomes very sparse or even absent on and near the hind and 

 upper margins, and which in some lights appears paler on the lower part ; 

 the eyes in life green with a strong brownish coppery tinge, and bearing 

 three rather narrow dark purple bands, of which the middle one is level 

 with the lowest part of the frontal callus but does not quite reach the hind- 

 margin, while the upper and lower bands are equidistant from the middle 

 band and somewhat approach each other at the back after the middle band 

 has ceased, lower margin of the eyes not purplish though apparently 

 darkened in some lights. Antennae with the basal joint covered with greyish 

 orange dust on apparently a blackish oi-ange ground colour and bearing 

 numerous long thin jDale hairs (most obvious on the underside) and several 

 short black bristles above on the apical half Avliich vary considerably in 

 quantity ; this basal joint extends rather cap-like over the short obscure 

 I'eddish orange second joint and this second joint bears a circlet of short black 

 bristles around the tip which are rather longer on the underside, and of 

 which sometimes only those on the underside are visible ; third joint reddish, 

 but darkened dorsally after the hump and with the annulations darkened ; 

 hump distinct and bearing tiny black bristles, the depth of the segment at 

 the hump Iteing fully two-thirds its length. 



Thorax tinged more greyishbrown or blackish through the orange pubescence 

 and more obviously striped, there being (when viewed from behind) three greyish 

 stripes down the disc, of which the middle one is rather narrow and tlie side 

 ones (not far away) wider but only distinct in front and just below the suture, 

 while on the broadest front part they have a tendency to curve over to the 

 vague grey side-stripes which extend back to the wing-base, and the grey part 

 just below the suture has a tendency to unite with other vague grey stripes 



