SrECIES OF CULEX AND ALLIED GENERA. 247 



The genus Ochlcrotatits is certainlj well founded, and is accepted here in its 

 Original sense, with the slight modification necessary for the inclusion of 

 Culicelsa. O. albifasciatus, Meg., the type of the genus, is unrepresented in the 

 British Museum Collection, two specimens so named by Walker certainly 

 being wrongly identified. 0. {Leucomyia) scapiilaris, Kond., is of precisely the 

 same type as the species tabulated below, and is certainly rot congeneric with 

 the other species of Leucomyia, which are here included in Ciilex. 



Theobald in publishing Grabhamia did not cite a type in any way, and Dyar 

 (Proc. Ent. Soc. Washington, 1905, p. 48) specified Culex dorsalis, Mg., as the 

 type; Felt, however, had previously (loc-. cit.) chosen C. jamaicensis, Theo., 

 which appears to be- a true Ciil'ex. The genQs Gr'abliamia, therefore, is not 

 synonymous with OMerotaUis and Culicada, but with Culex. 



Ochlerotatus is mainly a Palaearctic genus, comparatively • few species 

 occurring within the tropics, where, on the other hand, Culex • is more largely 

 developed. The Culicelsa group includes (besides C. taeniorhynchus, Wied., 

 the type, and the African species given below), Culex vigilax, Skuse, Taenior- 

 hynchus niger, Giles (which is very close indeed to C. taeniorhynchus, Wied.) 

 and others. C. alboannulatus, Mcq., is a true Ochlerotatus. C. accraensis, Theo. 

 incotaeniorhynchus, Theo.) is a Culex. In addition to the differences in ungues 

 and male palpi, Ochlerotatus seems to differ from Culex in the structure of the 

 male antennae, the plumes arising from the dorsal and ventral surfaces of the 

 antenna only, instead of in whorls as in C. pipiens. Whether the two genera 

 can always be distinguished 'in this way I am unable to say, as time has not 

 allowed the examination of the antennae of very many species. 



1. Hind ungues toothed in both sexes {Ochlerotatus, s. str.) ... ... 2. 



„ „ simple in i^ ... ... ... ... ... ... 6. 



2. Tarsi unhanded... ... ... ... ... ... ... ... 3. 



Tarsal joints banded at both base and apex ... ... ... ... 5. 



3. Abdomen unhanded, but in Q with yery small median basal pale 



spots ... ... ... ... ... ... ••• , ... 1. eumminsi. 



Abdominal segments basally banded .. . ... ... ... ... 4. 



4. Thorax more or less ornamented with pale lines ; wings without 



hght scales ... ... ... ... ... ... ... 2. dentatus. 



Thorax uniformly scaled ; wings with light and dark scales 

 (N. Africa and Europe only ) ... ... ... ...3. nemorosus. 



5. Banding of tarsi rather broad; abdominal segments with " pairs of 



dark patches ... ... ... ... ... ... ... 4V dorsalis. 



Banding of tarsi narrow ; abdomen almost all pale... 5. longisquamosus 



6. Hind ungues simple in both sexes {Culicelsa) ... ... ... 7. 



„ „ toothed in female ... ... ... ... ... 12. 



7. Legs banded ... ... ... ... ... ... ... ... 8. 



„ unhanded ... ... ... ... ... ... ... ... 11. 



8. Tarsal joints with apical and basal banding ... ... Q. pulcritarsis. 



„ „ basal banding only ... ... ... ... 9. 



9. Wings mottled with black and white scales ; dark species ... 10. 



„ not mottled ; more brownish species ; costal fringe whitish 

 beyond middle ... ... ... ... ... ... 7. hirsutus. 



10. Abdominal segments with apical lateral yellowish spots 8. durhanensis. 

 „ „ without such spots ... ... ...9. higcriensis. 



