Empididae. 267 



at Lohals; in Jutland in Vejle Nørreskov, at Hald near Viborg and 

 at Frederikshavn, and finally on Bornholm at Allinge; my dates are 



12/6_25/.,_ 



Geographical distribution: — Europe down into Italy: towards 

 the north to northern Scandinavia, and in Finland. 



23. Taehista Loew. 



Small species of black colour, and with blackish banded or varie- 

 gated wings. — The whole structure of the body in this genus quite 

 agrees with that in Tachypeza. The generic distinction lies in the 

 wings, the lower branch of the postical vein being totally absent. 

 For the rest I find only the following differences (at all events so far 

 as concerns the Danish species): Small ocellar bristles present, or 

 (annulimana) wanting; more or less distinct dorsocentral and acro- 

 stichal bristles present, the former sometimes long and strong behind, 

 the latter scarcely observable, practically absent; humeral bristles 

 sometimes, and postalar bristles always present. Scutellum with two 

 or four marginal bristles. 



The developmental stages are not known (see above under 

 l^achypeza). 



The species of this genus are very characteristic and easily known 

 by their banded wings. They are generally seen running on stems 

 and boards like the species of Tachypeza, and they show the same 

 behaviour; they have the wings lying flat over the abdomen and 

 are not unlike small Hemipters. Some species are found running on 

 the ground or in the sand at the horders of water and at the sea- 

 shore. 



Of the genus 18 species (one doubtful) are found in the palæ- 

 arctic region; 4 have hitherto been found in Denmark. 



Table of Species. 



1. A greyish white spot above the front coxæ 2. 



— No greyish white spot above the front coxæ 2. annulimana. 



2. Wings only brownish at the apex 4. terricola. 



— Wings more blackish marked 3. 



3. Wings with two blackish bands 1. arrogans. 



— Wings blackish, with the base white and a hyafine spot 



in the second posterior cell 3. sabulosa. 



1. T. arrogans L. 



1761. Linn. Fn. Suec. 1857 (Musca). — 1822. Meig. Syst. Beschr. III, 

 68, 1 {Tachydromia). — 1842. Zett. Dipt. Scand. I, 312, 1 {Tachypeza). 



— 1860. Loew, Zeitschr. fur Entom. Breslan, XIV, 20, 4. — 1862. Schin. 



