g2 Orthorrliapha brachycera. 



14. Rh. pennata Macq. 



1827. Macq. Soc. Se. Lille, 1827,133,6. — 1838. Meig. Syst. Beschr. 

 VII, 91, 46. — 1842. Zett. Dipt. Scand. I, 428, 49. — 1862. Schin. F. A. 

 I, 100. — 1903. Kat. palåarkt. Dipt. II, 228. 



Male. Eyes contiguous, the small frontal fcriangle grey; epistoma 

 light grey. Occiput grey, with black hairs. Labrum as long as, or 

 slightly longer than the head is high, ferruginous or brown. Antennæ 

 about as long as the head, blackish, the two basal joints yellow, with 

 short, brownish hairs, the third joint somewhat elongated and attenuated 

 towards the apex. Thorax dull grey, with three narrow, brow^n stripes, 

 the lateral slightly abbreviated in front, the median behind, the tw^o 

 interstices between the stripes slightly darker grey; the hiimeri with 

 a yellow point. The dorsocentral and acrostichal bristles short, but 

 somewhat strong, black; the former uniserial, the latter biserial; the 

 hinder dorsocentral bristles long and also the foremost somewhat long. 

 Further a humeral bristle, a posthumeral, a notopleural, a supraalar 

 and a postalar bristle, all black; besides there are only a few short 

 hairs. Scutellum with four black marginal bristles, the two median 

 strong. Pleura light grey, metapleura with blackish hairs. Abdomen 

 yellow or ferruginous, somewhat shining; it is densely haired with 

 erect, brown hairs which are long at the sides; those at the hind 

 margins of the segments slightly stronger than 

 the others. Venter yellow sparingly and short 

 haired. The exterior genitalia large and curious, 

 and they influence the shape of the hind part 

 of abdomen; from the sixth segment the end of 

 abdomen is bent upwards, the fifth dorsal seg- 

 ment is excised in the hind margin, and the 

 hind corners are drawn out and somewhat pro- 

 jecting; also the foUowing dorsal segments are 

 Fig. 19 Rh. pennata, go^g^vhat altered in shape, and they are small, 

 lying more or less hidden on the forwards pointing 

 side of the upwards turned part, the eighth ventral segment is some- 

 what arched; the lower lateral lamellæ are somewhat triangular (at 

 all events in situ), and the upper outer corner is drawn somewhat 

 out; they are haired on the surface and at the hind margin; the 

 upper lateral lamellæ are seen above between the upper edges of the 

 lower, they are likewise broad and have a black upper margin, but 

 I could not make out their exact shape, and they seera to be some- 

 v>'hat unsymmetrical. The yellow penis arises from the inner side of 

 the eighth ventral segment with a thick base, it stretches upwards and 

 the very thin end is curved forwards. The legs are yellow or ferruginous, 



