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THE ENTOMOLOGIST. 



abdomen_ is entirely yellow ; this may very likely be a variation of 

 our British species, or it may be another nearly allied form. A 

 similar variation — i. e. the reduction in the number of dark scales on 

 abdomen and wings — occurs in 0. nemorosus. Ficalbi's C. annulipes 

 has been redescribed from Finland by Theobald as C. fiavescens, and 

 Blanchard has renamed it C. arcanus. M. Goetghebuer records 

 G. annulipes from Belgium (Ann. Soc. Ent. Belg. 1910, p. 84), but 

 states that the female has simple claws and median rings on the 

 metatarsi. Perhaps his species is T. richiardii, Fie. 



Fig. 1. 



Fig. 2. 

 Fig. 1. — Ochlerotatus annulipes, Mg. Male genitalia (diagrammatic). 

 Fig. 2. — 0. maculatus, Mg. Male genitalia (diagrammatic). 



4. 0. maculatus, Mg. — Thoracic scales mainly dark brown, 

 but a variable number of yellowish white ones are present. These 

 latter are usually found on the margins of the mesonotum, in 

 front of the scutellum, and as a pair of thin pale lines of variable 

 length, sometimes reduced to a pair of rather prominent whitish 

 spots near the middle of the thorax. Pale bands of abdomen 

 often very indistinct in the female, represented by median basal 

 spots on some or all of the segments ; the whole dorsal surface 

 of the abdomen, like the wings and legs, is speckled over with 

 pale scales. Average length, 7-8 mm. 



Widely distributed and probably common. 



Synony7ny. — This species is usually known as Culex cantans, Mg. 

 Meigen, however, states that his previously described C. maculatus 

 is only the male of C. cantans. Stephens's C. fwnipennis is generally 

 accepted as a synonym of C. cantans, but I think wrongly. Stevens 

 stated that the " white rings at the base of each joint of tarsi" w^ere 

 *' nearly obsolete"; this would apply very well to T. morsitans or 

 T. theobaldi, but not to 0. cantans. As, however, it would be im- 

 possible to decide which of these two Tiieobaldias Stephens had, and 

 as no British species known to me can be said to have the " wings 

 obscure," I do not revive this old name. Theobald's Ctdicada water- 

 Jiousei is certainly only 0. maculatus, as the genitalia of the type 

 (though not of the figure) agree well with those of typical maculatus 

 as figured by Meijere, and roughly in this paper. C. tvaterhousei 

 agrees with all other British Ochlerotatus except 0. lateralis in having 

 the hind claws toothed. 



