220 O. R. Osten Sacken: Diptera 



The name Xenaspis alludes to the unusual sliape of the scu- 

 tellum. I am in doubt about the relationship of this genus. The shape 

 of the scutellum and the smallness of the second basal and anal cells 

 are very peculiar characters, 



Fig. 5. 



2= 



Xenaspis polistes. 



JCenaspis polistes n. sp. $$. General coloring brownish- 

 yellow, with some hrown markings on head and thorax and a 

 longitudinal hrown stripe on the abdomen; wings with a pale 

 yellowish-hrown tinge, more saturate on the anterior side. Length: 

 12—14 mm. 



Head reddish-yellow ; a more or less well-marked brown stripe in 

 the middle of the face, does not reach the base of the antennae; bottom 

 of antennal furrows brown; an ill-defined subtriangular brown spot on 

 the front, above the yellowish lunule; a brownish shade on each side 

 of the ocelli; antennae reddish-yellow; palpi brown, reddish at tip. 

 Thoracic dorsum clothed with a short and dense golden pubescence; 

 brown markings, in the shape stripes, are more or less distinct in 

 different specimens; scutellum yellow. Abdomen densely clothed with 

 a golden-yellow pubescence, with an irregulär black longitudinal stripe 

 in the middle and more or less distinct lateral stripes of the same 

 color. Coxae brownish; femora reddish-yellow, usually with a brown 

 spot on the underside of the distal half: tibiae and tarsi reddish-brown, 

 the former with some irregulär dark-brown lines and marks. Halteres 

 reddish. Wings with a pale brownish tinge, more saturate yellowish 

 between the costa and the fourth vein, darker brownish on the distal 

 half, especially along the third vein. — Two males and five females. 



N a u p d a. 



0. Sacken, Bull. Soc. Entom. Fr. 10. Aug. 1881. 



Naupoda is a curious little fly, especially distinguished by its 

 broad and short stature, its flattened head and large development of 

 its basal cells; the second basal cell.reaehes the middle of the wing 

 and thus crowds out the discal cell, which is reduced to the shäpe of 

 a Square (see fig. 6). 



