Platychirus. 195 



legs as in the male, but the dilated joints narrower, and the bristles 



on front femora less strong than in normal males. Below I have 

 mentioned such specimens of peltatus and scutatus. 



Of the genus 19 species are known from the palæarctic region; 

 1 1 occur in Denmark. 



Table of Species. 



Males. 



Front tibiæ practically not dilated, but the two first 



tarsal joints much dilated 2. 



Front tibiæ distinctly dilated, if slightly also the tarsi 



slightly dilated 3. 



Thorax dull; mouth edge more produced than the 

 central knob; hind tibiæ with few long hairs above 



in the middle 1 . manieatus. 



Thorax shining; mouth edge scarcely more produced 

 than the central knob; hind tibiæ with numerous 



long hairs above in the middle 2. tarsalis. 



Front tibiæ dilated more or less abruptly at the apex 

 or in the apical third; antennæ pale beneath third 



joint 4. 



Front tibiæ evenly dilated from base to tip (in stic- 

 ticus very slightly), or dilated soon after the base; 



antennæ all black (except sticticiis) 6. 



Front femora with a ciliation of strong bristles behind 

 in almost the whole length; first tarsal joint very 



large, as long as the four following joints 3. peltatus. 



Front femora with two clumps of tangled hairs behind 

 near base ; first tarsal joint smaller, not so long as 



the four following joints 5. 



Front tibiæ with a tuft of black hairs above the 

 dilatation; first tarsal joint six times as long as the 

 equally broad second joint ; abdominal spots yellowish 4. scutatus. 

 Front tibiæ with a few black hairs above the dilata- 

 tion ; first tarsal joint not three times so long as 

 the narrower second joint; abdominal spots hoary 



æneous 5. albimanus. 



Front femora with a row of five or six long, isolated, 



black, bristly hairs behind in the whole length 7. 



Front femora without a row of long, isolated hairs 



behind 8. 



Front femora with no peculiar, white, tangled hair 



at the base; abdominal spots large 6. scambus. 



Front femora with a pecuhar, white, tangled hair at 

 the base; abdominal spots very large, abdomen ex- 



tensively yellow with only narrow black lines 7. immarginatus. 



Femora and tibiæ all yellow, front femora with a dense, 



black ciliation behind 8. fulviventris. 



13* 



