250 Orthorrhapha brachycera. 



Female. Epistoma broad, silvery whitish grey. Palpi somewhat 

 large, grey. Antennæ shorter than in the male, a little longer than 

 the head, third joint short; arista about as long as the antennæ, 

 Abdomen metallic green or æneous, with yellovv side spots on the 

 second segment (according to Kowarz these may also be wanting). 

 Wings a little more tinged than in the male, 



Length about 4 mm. 



A. elongata is very rare in Denmark, only one specimen, a female, 

 has been taken on Amager on ^7*^ ^^^^ i^^^ author). 



Geographical distribution: — Northern and middle Europe down 

 into Bohemia; towards the north to middle Sweden. 



13. Leucostola Loew. 



This genus agrees in almost every respect with Argyra; it 

 was separated by Loew in 1857 (Neue Beitr. V, 39) only with the 

 bare first antennal joint as distinguishing character. Loew was led 

 to separate the genus, as he laid great stress on this character, 

 because he divided all the Dolichopodids into two groups by aid of 

 it. The genus has since been generally accepted (though not by 

 Schiner), — The head as in Arggra, the female has vertical bristles, 

 the male not, Antennæ with the second joint overlapping the third 

 somewhat on the inside; the first joint not hairy above, Scutellum 

 bare above, with two strong marginal bristles and at each side a smaller 

 hair. Abdomen somewhat more flat than in Argyra. Middle tibiæ 

 with only one or two bristles below. Hind metatarsus shorter than 

 the second joint. 



The developm ental stages of L. vestita have been described by 

 Beling (Arch. fur Naturgesch. XLVIII, 1, 1882, 225, 30), The larva is 

 10 mm long, 1 mm in diameter, cylindrical, yellowish white, somewhat 

 hyaline, The last segment has five teeth or warts, three above and 

 two larger below, the latter with a broader base and placed more 

 backwards than the upper; of the upper teeth the median is smaller 

 than the lateral; below the upper teeth lie the posterior spiracles, — 

 The pupa is 4 mm long, 1,5 mm in diameter, dirtily yellow; the head 

 has a small point in front, and four short hairs. At the front margin 

 of the thoracic disc there are two long, approximated spiracular tubes. 

 The first eight abdominal segments (probably the second to ninth) 

 have above a transverse row of short, dense spines or teeth of unequal 

 length. The larva was found in sandy mud at the border of a 



