256 Orthorrhapha brachycera. 



strong, short bristles on the thoracic disc, tiiree on each side in an 

 oblique transverse row, tiie lowerraost standing about at the base of 

 the wing sheaths; at the front margin of thorax there are above in 

 the middle tvvo rather approximated, long, cylindrical spiracular tubes, 

 pointed at the end. The abdominal segments have each, except the 

 first, a girdle of flat, short spines above, they are directed backv^ards 

 and of unequal length, short and longer regularly alternating; the last 

 segment terminates with tw^o spines. There are seven pairs of ab- 

 dominal spiracles. The pupa was found in the sand at the border 

 of a pond on ^^/t. Mr. Schlick did not observe any cocoon, but no 

 doubt such has been present, but has been destroyed by digging 

 out the pupa. 



The species of Porphyrops are beautiful flies, though generally of 

 soraewhat dark colours; they occur at the border of water, and are 

 found on the leaves of bushes and in lov^ herbage, and also running 

 at the sand down at the water. The species are generally somewhat 

 rare, and only found in single or a few specimens on a place; only 

 two of our nine species, spinicoxa and crassipes are a little more 

 common. 



Of the genus about 28 species are known from the palæarctic 

 region, and besides there are some doubtful and uncertain species; 9 

 have been found in Denmark. 



Table of Species. 



Males. 



1. Middle coxæ with an apical spine 2. 



— Middle coxæ without apical spine 5. 



2. Epistoma black ; lower postocular hairs black or blackish; 

 hind femora without preapical bristle 3. 



— Epistoma white ; lower postocular hairs whitish ; hind femora 

 with one or more preapical bristles 4. 



3. Arista longer than the antennæ ; outer genital lamellæ 

 forked; front metatarsus as long as the four foUowing 



joints ; hind tibiæ not dilated 1. spinicoxa. 



— Arista shorter than the antennæ ; outer genital lamellæ 

 not forked ; front metatarsus scarcely as long as the three 

 following joints ; hind tibiæ dilated 2. fascipes. 



4. Arista longer than the antennæ; both middle and bind 

 coxæ with an apical spine; sixth abdominal segment steel- 



blue or purplish 3. elegantula. 



— Arista shorter than the antennæ ; only middle coxæ with 

 an apical spine and this long ; sixth abdominal segment 

 concolorous with the others 4. nemorum. 



5. The last two joints of the middle tarsi dilated 5. crassipes. 



— The last two joints of the middle tarsi normal 6. 



