﻿50 ENTOMOLOGISK TIDSKRIFT 1 92 I. 



Theobaldia. 



1. Wings spotted, by dense accumulation of scales on the 

 cross-veins and bases of fork-cells; tarsal joints white- 

 ringed at the base 2. 



— . Wings unspotted (unless indistinctly at base of vein 



R4-H5) --- - ;- 4- 



2. Femora before the tip, and hind metatarsi in the middle, 

 with white rings .-. - 3- 



— . No white rings in these positions... sibcricnsis LUDLOW. 



3. Abdomen dark brown banded with white 



annulât a Schrank. 

 — . Abdomen nearly uniform ochreous [subochrea Edw. MS.] 



4. Tarsi entirely dark --. bergrotJii sp. n. 



— . Tarsi with narrow pale rings ..- -.- 5- 



5. Front metatarsus of male distinctly longer than the re- 

 maining joints together; proboscis of female almost en- 

 tirely black.. morsitans THEO. 



— . Front metatarsus of male not longer than the remaining 

 joints together; proboscis of female largely pale at the 

 sides and beneath fuinipeunis Steph. 



Ochlerotatus. 



1. Joints of tarsi with white rings at the base.... — 2. 



— . » » » with pale rings embracing both ends ... 8. 

 — . » » » without pale rings 9. 



2. Rings of middle joints of hind tarsi less than half as long 

 as the joints; dark species; outer side of hind femora 

 with numerous scattered dark scales 3. 



— . Rings on middle joints of hind tarsi more than half as 

 long as the joints; lighter species; outer side of hind 

 femora pale except towards tip 4. 



3. Hind tarsal rings very narrow; smaller species; abdomen 

 with distinct pale abdominal bands constricted in the 

 middle and at the sides -. vcxans Mg. 



— . Hind tarsal rings broader, nearly half as long as the 

 joints; larger species; pale abdominal bands less distinct 

 & not constricted in the middle maculatus Mg. 



