82 H. C. EFFLATOUN. 



tabanoides Jaenn., Abhandl. Senkt. Ges., VI. 402. (94). 126. 

 t. II. f. 10. (1867); Beck., Mitteil. Zool. Mus. Berl., II. 83. 117. 

 (1903). 



DIAGNOSIS: — Antennae orange-yellow ; eyes touching in the 

 male for two-thirds of the length of the vertical triangle. 



DESCRIPTION:— Male: Face entirely black and covered with 

 a dense light silvery-grey tomentum, as well as with a soft yellow- 

 ish-grey pubescence, except on the shallow hollow below the 

 antennae. The prominence of the face and the two thin longitudinal 

 lines beside it, the upper mouth edge and the two lines on the 

 genae are all shining black. Vertex shining black with black 

 pubescence. Frons covered with hairs, which are light grey in 

 front, but black on the middle and below, except for a very small 

 shining black space just above the antennae. Eyes reddish- 

 vellow, touching for a fairly long distance; they are spotted with 

 brown and possess short light brown hairs, which are nearly always 

 seen only on the superior part of the head ; on this upper part 

 the spots are more frecruent, run together, and in rare cases they 

 are entirely absent. Antennae reddish-yellow, but at the base and 

 upper part of the third joint brown, with a reddish-brown and 

 fairly long and bare arista. 



Thorax is shining aeneous black and bears five greyish-white 

 longitudinal stripes which never reach the lower margin, but as a 

 rule, they end about two-thirds of the way down and sometimes 

 half the way down the thorax ; of these the median is the nar- 

 rowest, the two lateral the broadest, and the two others interme- 

 diate in breadth. Pubescence is equal, dense and light grey, but 

 on the margin and pleurae it is much longer and of an ashy-grey 

 colour. Scutellum brownish-yellow, translucent, with a vestiture 

 similar to that of the thorax. 



Abdomen reddish-yellow ; the basal segment is whitish-grey on 

 the sides and dull dark grey in the centre, with its lower margin 

 shining black and covered with a short lead-grey pubescence. 

 The second segment possesses on its upper margin a wide dull 

 black band, which is crescent-shaped and supported by a median 

 line with an expanding base (somewhat resembling an urn), which 

 reaches to tne lower margin ; this base is continued laterally in a 

 thin line, which again widens as it reaches the side margin ; 

 sometimes this line is interrupted in the middle so that only its 

 widened ends remain, and are seen like fairly large spots on the 

 lower side-margins; the segment is clothed with yellowish pubes- 

 cence, about the same length as that of the thorax and its lower 

 end has a metallic sheen. The third segment is not very unlike 



