1916. 307 



Pace shilling blackish like the froiis ; very dark 



species ■. . . .0. t tiherosum Limdstr. 



•i. 'I'iiurax somewhat shiiiin<^, with scarcely a ti'ace of 



silvery-grey lateral patches towards the front . . .7. argyreatum Mg. 

 Thorax scarcely shining, with coarser pubescence and fairly distinct silvery- 

 grey lateral patches towards the front 5. 



5. Pale markings of legs sharply defined ; hind meta- 

 tarsi clear yellow on basal half 3. reptans L. 



Pale markings of legs less sharply defined ; basal 

 half of hind metatarsus more smoky yellow (in- 

 sufficiently known for proper distinction) 4. tnorsitans Edw. 



5. austeni Edw. 



Group B. 



Tibiae without any silvery-grey dusting ; when the front tibiae 

 are silvery, this is owing to the colour of the pubescence ; thorax and 

 abdomen of male with the silvery markings replaced by coarse pubes- 

 cence, which is also present in the female ; abdominal integument of 

 the female entirely dull ; front tarsi not at all thickened. 



The six species in this group are not so closely allied as those in 

 Group A. S. latipes is perhaps the commonest and most widely dis- 

 tributed species of the genus with us ; S. equinnin is also common in 

 many parts of England; S. hirtipes is another mountain insect; the 

 remaining three are more or less local or uncommon. S. latipes is 

 apparently quite harmless ; 8. hirtipes and (S'. equinum are both 

 blood-suckers, the latter having a partiality for horses' ears. 



In my previous paper an error occurrred in the tabulation of the 

 species of this group, the females of 8. aureum and 8. angustipes being 

 wrongly described as having the hind metatarsi dark. I therefore 

 give the following fresh tables, based rather on obvious colour 

 characters than on obscure, though important, details of structure. 



Males : 



1. Hind metatarsi largely pale and quite thin 8. equinum L. 



Hind metatarsi entirely dark and often more or less thickened 2. 



2. Hind metatarsi very much thickened, as broad as the tibiae 3. 



Hind metatarsi very little thickened, never as broad as the tibiae 4. 



3. Legs, especially the hind pair, densely hairj' 13. hirtipes Fries. 



Legs not remarkably hairy 9. latipes Mg. 



4. Pubescence golden ; legs not very hairy 5. 



Pubescence duller, yellowish, hind legs more hairy 



than usual 12. subexcis%im Edw. 



