62 ASILIDJ2. 



yellow bristles. Palpi clothed with tawny hairs. First and second 

 joints of the antennae clothed with a few black hairs. Thorax silvery 

 on each side and beneath, ; the disc cinereous, with 2 slender black stripes. 

 Wings very slightly grey; veins black, slightly clouded with brown 

 towards the base, where they are tawny. Halteres yellow. Abdomen 

 bronze-black ; hind borders of the segments towards the tip dark 

 tawny. Legs red, armed with tawny spines ; femora and anterior tibiae 

 striped with black ; hind tibia black, red at the base ; tarsi black at 

 the base of each joint. 

 Not rare. (E.) 



Genus V. LEPTOGASTER. 



LEPTOGASTER, Mg. kl. (1804); Fin.; Mq. ; Zll.; Ztt.; Lw. Asilusp., 

 Dg. ; Grfr. ; Fb. ; Shr. Dasypogon p., Fb. Gonypes, LI. ; Mq. 



Corpus medium aut minus, glabriusculum, angustum. Color cinereus, 

 opacus. Oculi virides, unicolores. Proboscis porrecta. Antenna 

 quinque-articulatce, stylatce ; articulus tertius longus ; quartus brevis- 

 simus. Alae breves ; areola mediastinalis aperta. Abdomen fragile, 

 elongatum, sublineare. Pedes inermes, glabriusculi ; tibiae recta3. 

 Onychia nulla. 



Body of middle size, slender, almost bare. Head flat, semicircular ; 

 front contracted. Epistoma flat, furnished with a few bristles. Eyes 

 large, green, in front nearly flat, and composed of large facets. Ocelli 

 3, seated on a tubercle. Proboscis short, horizontal. Labrum short, 

 clavate. Lingua flat, narrow, pointed, as long as the labium, 

 beset above towards the tip with retracted hairs. Maxilla3 flat, 

 narrow, linear, pointed, as long as the lingua. Palpi calvate, almost 

 bare, probably one-jointed ; the tips beset with some short bristles. 

 Labium tumid, excavated above, somewhat dilated in the middle, 

 obtuse and hairy at the tip. Antenna -jointed, porrect, stylate, 

 approximate at the base, diverging upwards ; first and second joints 

 short, equally long, almost cylindrical, somewhat more slender at 

 the base, hardly bristly; third long, clavate, compressed, bare; 

 fourth very short; fifth cylindrical, hairy, pointed. Thorax nearly 

 globose, almost without bristles. Wings narrow, lanceolate, very 

 finely pubescent, with fringed hind borders; mediastinal areolet open. 

 Alulae small. Halteres uncovered. Abdomen with 7 segments, bare, 

 slender, very long. Legs slender ; hind legs long, with clavate femora 

 and tibiae. Onychia none. 

 Male. Abdomen cylindrical. 



Fern. Abdomen somewhat widened towards the tip. 

 These flies inhabit meadows during the summer ; their move- 

 ments are slow ; they are remarkable on account of the great 

 length and slenderness of the abdomen. 



