MICKODOX. 121 



13 (2) Third antennal joint four times as 



long as the fir t, feathered, clothed 

 with long and soi't hairs ou its inner 

 and outer sides ; arista rudimentary, 

 represented by a very short stump ; 

 eyes very widely separate, without 

 prominent angle in the middle of 

 the frons ; lace with oblique fur- 

 rows; ocelli rather distant ; seutellum 

 rounded ; legs bare Ptilobacfrum, gen. nov. 



14 (1) Middle cross- vein situate beyond the 



middle of the dkcal cell; third 

 longitudinal vein without a stump; 

 no distinct cross-vein connecting the 

 tips of the auxiliary and first veins; 

 subapical cress- vein bent towards 

 its middle and there provided with 

 an outwardly directed stump ; first 

 antennal joint ver} 7 short, hardly 

 vi-ible, the second greatly elongate, 

 longer than the third; oceUi dis- 

 tant ; frons of male contracted 

 towards the middle ; scutellum 

 rounded ; body cylindrical, strongly 

 punctate ; Irgs almost bare Atupkotenu, gen. nov. 



GROUP I. (illucens, sp. n.). 



There is only a single specimen, without a head ; notwithstanding 

 this, 1 think it better to name it, as it is very strongly differentiated 

 and is reminiscent of the American genus Ifyxoyaster, which, 

 however, lacks the stump on the third vein. The recently described 

 J/. acantkolepidit, Speiser (1913), perhaps belongs here, but 

 .seems to have a sessile abdomen. 



129. Microdon illucens, sp. n. 



d 1 . Length of the body (without head) 8 mm. 



A slender elongate species, very distinct owing to the abdomen 

 being pedunculate and to the presence of tAvo thin and short but 

 well-developed spines on the scutellum. 



Head wanting. Thorax subquadrate, black, strongly punctate, 

 and consequently dull, with very short grey pubescence ; shoulders 

 sinning yellowish ; pleura? towards the middle with a vertical broad 

 band of silvery shining thick pubescence ; the upper extremity of 

 this band emits a small transverse band, which runs along the 

 suture and across the back, being interrupted in the middle ; a 

 similar but less well-developed band is to be observed in front of 

 the scutellum, and before this band is a triangular deep black spot. 

 Scutellum strong, convex, rounded behind, punctate and coloured 

 like the thorax ; the two small, short, yellow spines are placed 

 rather low down, and are slightly curved upwards. Metanotum 

 shining black. SquamuUe white, very small, with bare margins ; 



