Empididae. 



45 



5. Rh. spinipes Fall. 



1815. Fall. Dipt. Suec. Empicl, 26, 24 (Ewpis). — 1822. Meig. Syst. 

 Beschr. III. 49. 15. — 1842. Zett. Dipt. Seand. I, 395, 7, et 1849. VIII, 

 3034, 7. - 1862. Schin. F. A. I, 98. — 1903. Kat. palaarkt. Dipt. II, 229. 



Male. Eyes contiguous but not for a long distance, tlie frontal 

 triangle being high, but narrow. Epistoma dark grey. Occiput grey 

 with black, downwards somewhat brownish hairs. Labrum slightly 

 longer than the head is high; palpi black or brownish black, with 

 blackish or brownish hairs. Antennæ somewhat longer than the head, 



Fig. 10. Antenna of Rh. spini])es. X 65. 



black, the two basal joints slightly greyish, with long, black hairs; 

 the third joint considerably elongated, especially in its terminal part. 

 Thorax dark grey, sHghtly shining, with three blackish or brownish 

 black stripes, the median narrow, the lateral very broad, occupying 

 the whole lateral space; all three stripes somewhat abbreviated both 

 in front and behind. The acrostichal and dorsocentral bristles long, 

 black; the former somewhat irregularly biserial, the latter long and 

 strong behind and here about uniserial, but pluriserial further for- 

 wards, and in the front part fusing with similar hairs clothing the 

 disc at the sides behind and inwards to the humeri; there is no 

 strong humeral bristle, but a posthumeral, generally four notoplural, 

 some supraalar and a postalar bristle are discernible among the 

 weaker hairs; they are all black. Scutellum grey with six to eight 

 black marginal bristles. Pleura dark grey; metapleura with black or 

 brownish black hairs. Abdomen blackish brown, very slightly shining; 

 seen from in front it is more greyish, w'iih a black, interrupted middle 

 line; venter dark grey. Abdomen is clothed with long, erect, black 

 hairs which are strongest at the hind margins of the segments and. 

 here fan-like spread; venter has long, black hairs. The exterior 

 genitalia have the lower lateral lamellæ blackish, the lower margin 

 is straight, the upper oblique, the lamellæ thus attenuating towards 

 the apex and here curved towards each other; on the inside, near 

 the apex there is a little tooth; the lamellæ have long, black hairs 



