420 TABANID^ 



but not beyond the upper eye-angles ; behind the vertex are some longer 

 thin pale yellow hairs. Palpi dull golden colored ; second joint long though 

 thickened for nearly the basal half, but tapering gradually after that to 

 a point, rather drooping and about four times as long as its thickest part, 

 bearing numerous though not dense short black bristles all over the upper and 

 outer sides, but sometimes with these black bristles less numerous on about 

 the basal half and then with numerous shimmering yellow bristles intermixed, 

 and this second joint bears beneath about its base some longer pale yellow 

 pubescence, but is bare on its inner side ; basal joint more greyish orange, and 

 bearing long pale yellow pubescence. Eyes bare ; facets all equal ; in life 

 (according to Brauer) green, but red above towards the vertex and below on the 

 margin, and with three arched yellow-margined purple bands on the disc. 

 Antennai similar to those of the male, but the circlet of black bristles round 

 the tip of the second joint extending all round the lower part ; dorsal hump on 

 the third joint more defined and consequently the basal segment of that joint 

 less than twice as long as its deepest part. 



Thorax very similar to that of the male, but with shorter and more in- 

 conspicuous pubescence ; pleurae with the pubescence (in English specimens) 

 slightly yellowish. 



Abdomen broad and almost oblong, blackish but sometimes with the grey 

 dorsal stripe better defined and then with the blackish stripes next to it also 

 more defined, after which the ferruginous flecks on the second to fifth 

 segments are also more defined but leave the hindmargins widely though 

 obscurely ferruginous grey ; outside the ferruginous flecks there is on each 

 side a rather large blackish hind-corner blotch on the third segment, and 

 most of the sides of the fourth and fifth segments (except the hindmargins) 

 are blackish ; pubescence more obviously yellow on the ferruginous flecks. 

 Belly as in the male, but more ferruginous and sometimes with more signs of 

 a blackish middle stripe ; the black bristly hairs beneath the seventh segment 

 conspicuous, as they stand out longer and more erect than the short depressed 

 pale pubescence on the rest of the belly. 



Legs colored as in the male, but the front tibire and tarsi rather 

 more dilated ; pubescence on the femora shorter and less abundant ; ciliation 

 on the hind tibiae inconspicuous, and all tibiae with very few dorsal black 

 bristly hairs except about the tip. 



Wings slightly more brownish than in the male. Squamae with lighter 

 brown margins. Halteres more brownish. 



Length about 15 mm. 



This species is easily distinguished from any other of the restricted 

 genus Tabanus by the mainly shining black or blackish chestnut frontal 

 triangle ; two species of ThcriopUvtcs have the frontal triangle shining, but 

 T. micans has the legs entirely black, and T. lurid xs has the frontal triangle 

 shining in the female only and has the lower callus connected by a narrow 

 line with the middle one ; as far as my specimens indicate there is an 

 almost equal broad light grey dorsal stripe all down the abdomen in place 

 of the usual hindmarginal triangles. I do not know enough of the species 

 to say anything about its variations, but the female given to me by Mr 

 Wormald has the basal segment of the third antennal joint with a remark- 

 ably broad blunt tip. 



The var. cognafus Lw. is considerably darker and has in both sexes the 

 side-spots isolated from the hindmargins. Therioplcctcs quatnornotatus is 

 extremely like T. glaiccopis in at any rate the female but may be distinguished 

 by its hairy eyes. 



T. glaueopis is very little known as a British species. I caught 

 two females on the window of the weighing stand (now pulled down) on 

 Goodwood race-course on July 30, 1884, and a female was given to me 

 previous to 1880 by Mr AVormald. Brauer states that he has met with it 



