430 



TABANID.^ 



sparser hairs spread out on the fifth, and still sparser hairs on the sixth 

 segment ; the sides of the abdomen bear longer coarser outstanding black 

 pubescence, without any yellow pubescence on the sides of the basal 

 segments. Belly dull black, with the sides of the two basal segments widely 

 but rather obscurely orange ; pubescence on the disc obscurely greyish, but 

 the hindraargins of all segments with a fringe of yellow hairs, and the second 

 segment with longer pubescence. 



Legs rather shining black, but dull reddish orange on the middle tibiae 

 (except at the extreme base and tip), and on the basal joint (except at the tip) 

 and the basal half of the second joint of the posterior tarsi ; pubescence 

 almost as in C. ccecutiens. 



Wings blackish brown, but brownish hyaline on the outer third of the 

 upper basal cell and on the adjoining part of the middle basal cell, and the 

 large middle dark band leaves the submarginal cell brownish hyaline above 

 the cubital fork, and this colour extends down in a concave line to the 

 middle of the third posterior cell but leaves the outer part of the submarginal 

 cell and the outer upper part of the cubital fork-cell light brown, while the 

 anal cell (except on its upper margin) and all the hind angle of the wing and 

 the large alula are also brownish hyaline. Squamae blackish with black 

 margins and with slight dark fringes which are tufted at the angle. 

 Halteres brownish black. 



Fig. 245 Chrysops 



quadrata 9 . 

 Left eye in life. 



$ . Differing from the male as usual in Chryso2)s, the colour being lighter, the wing- 

 markings more contrasted, and the abdomen with more extensive orange mark- 

 ings at the base. Frons, frontal callus, facial calli, antennae, proboscis, palpi, 

 etc., as in C. ccecutiens, but the frontal stripe slightly 

 narrower. Eyes in life (tig. 245) not dissimilar to those of 

 C. ccecutiens, but sometimes of a more intense green shading 

 into blue and without any coppery tinge, or varying from 

 brilliant coppery on the upper part to dark bluish green 

 on the lower part, or in another specimen all the spots 

 may be rather small and transverse on an intense blue- 

 green ground, or the spots may be larger and strongly 

 contrasted on an almost coppery yellow ground, and when 

 seen from below the eyes may appear to be pale greenish 

 blue with brown spots ; occipital band narrower and less 

 intense than in C. ccecutiens, almost fading aAA^ay towards 

 the vertex; the spots and bands more brownish than 

 purplish and consequently lighter colored, the top spot 

 being larger, the isolated middle spot less triangular, and 

 the lowest spot larger and more transverse, but it will be seen that the 

 markings vary considerably within a limited degree. 



Thorax, pleurae, and scutellum almost as in C. ccecutiens. 

 Abdomen dullish black with extensive orange and greyish orange markings 

 (fig. 246); the two basal segments wholly bright 

 orange or yellow except on the black middle third 

 of the basal segment (hardly extended to the hind- 

 margin) and on a small black spot (varying a little 

 in shape) on the middle of the base of the second 

 segment which extends less than half-way down 

 the segment; third segment with its sides and 

 nearly its hinder half greyish orange with a gently 

 produced middle triangle ; fourth segment similarly 

 marked but with the greyish orange hindmargin rather 

 narrower and the middle triangle larger and almost 

 reaching the foremargin ; fifth segment also similar 

 but the greyish orange portion more vague and more 

 extended, and the sixth and seventh segments all 

 obscurely greyish orange. Pubescence on_ the disc 

 yellow on the orange base and on the greyish orange 



parts, longer about the sides and hindmargins, but almost absent on the 

 black bases of the third and fourth segments. Belly clear orange on the 

 two basal segments and on most of the sides and hindmargin of the third 



Fig. ii6.- 



-Chrysops quadrata 

 9. X 6. 



