12 Orthorrhapha brachycera. 



L. nigrimana Meig. 1824. 1. c. 108. — 1848. Zett. 1. c. 2809, 8. — 1903. 

 Kat. palåarkt. Dipt. II, 353. — L. thoracica Meig. 1824. 1. c. 108. — 1848. 

 Zett. 1. c. 2803, 2. — 1903. Kat. palåarkt. Dipt. II, 354. — L. palmtris 

 Meig. 1824. 1. c. 109. — 1903. Kat. palåarkt. Dipt. II, 353. — L. jmnctum 

 Meig. 1824, 1. c. 110. — 1903. Kat. palåarkt. Dipt. 353. — L. trilineata 

 Zett. p. p. 1848. 1. c. 2804, 3. — 1862. Schin. F. A. I, 244. — 1890. 

 Stein, Wien. ent. Zeitg. IX, 110. — 1903. Kat. palåarkt. Dipt. II, 354. 



Male. Vertex and frons yellow, shining; ocellar triangle blackish 

 and the space around it may be more or less darkened; vertical 

 bristles black or generally the outer • yellow, very rarely one of the 

 inner, or both, yellow. Epistoma whitish. Occiput yellow, more or 

 less grey above, postocular bristles yellow. There are six oral bristles 

 on each side, the hindmost yellow, the others black. Antennæ black, 

 sometimes yellowish at the base. Thorax somewhat shining, very 

 varying in colour; either quite yellow, or with a narrower or broader 

 greyish black middle stripe, or with three stripes and these may be 

 narrower or broader, and they may be conflaent so that thorax is 

 quite blackish grey; scutellum yellow, or with the thoracai middle 

 stripe continued over it, or nearly quite dark; postscutellum yellow 

 or generally dark. Pleura generally yellow, only in the darkest speci- 

 mens more or less to quite dark. Abdomen likewise very varying in 

 colour; in the palest specimens it is yellow with only the base more 

 or less dark grey, and with the hypopygium yellow; then the dark 

 part may be larger, so that only the apical parts and the sides are 

 yellow, the hypopygium dark grey, and fmally abdomen may be all 

 dark grey; the venter varies in a similar way. The fourth abdominal 

 segment is longer than the third. Abdomen is clothed with short, 

 scattered, black hairs; near the hind margin of the segments is a row 

 of a little longer hairs, longest towards the apex, and near the side 

 margin is on each segment a longer hair; the venter has short hairs, 

 longer on first and second segments; on the second ventral segment 

 are on each side two to three bristles, and on the third likewise one 

 or two smaller bristles and some strong hairs. Hopopygium with 

 somewhat large, yellow apical lamellæ, with black bristles at the apical 

 margin, and between these, nearer the ventral side, some which are 

 hook-like bent at the end, and are characteristic for the species; the 

 posterior inner lamellæ (gonapophyses) have a tooth-like process at 

 the base on the outer side and are hook-like curved inwards at the 

 apex; the anterior are about straight, with bristles on the inside, of 

 which the apical one is strongly curved. Legs yellow, front tarsi 

 often a little darkened and the last three joints more or less dark; 

 posterior tarsi more or less darkened towards the end; the last four 



