220 MOSQUITOES OF NORTH AMERICA 



perturhans of Williston. That species has since been found to belong to the 

 Sabethini, and as the generic name follows its type species, we are compelled 

 to treat Isostomyia Coquillett as a sabethine with Aedes piirturbans Williston as 

 the type, regardless of the material that was before Coquillett and from which 

 he derived the characters of the genus. Isostomyia, therefore, will be found in 

 this work among the Sabethini (page 187). 



The genera Lasioconops Theobald, Oculeomyia Theobald, and Pseudohepto/- 

 phlehomyia Ventrillon are unkno"WTi to us, except from the descriptions, which 

 olfer nothing tangible. We include them in the synonymy on the authority of 

 F. W. Edwards (Bull. Ent. Eesearch, ii, 256, 1911) . 



Culcx, as treated by most authors, does not constitute a generic unit in the 

 modem sense of the tenn. This not only applies to the work of the earlier 

 authors, but also to many of the present day. The genus was first restricted in 

 a consistent manner by Felt, in 1905, on the basis of the male genitalia, the 

 heterogeneous forms being transferred to other genera. Shortly afterward Dyar 

 and Knab restricted the genus in a similar manner on larval characters. These 

 authors removed from Culex a few aberrant forms, which we now think best to 

 return to the genus. Theobald, in 1907, adopted the restriction by the char- 

 acters of the male genitalia, but failed to carry it out consistently, including 

 species which belong to other genera. Furthermore, species properly belonging 

 to Culex, in the most restricted sense, were scattered by him throughout other 

 genera, or separated into genera of their own on trifling characters. The follow- 

 ing table of the adults is based principally on the females, and it should be 

 noted that the proboscis may be white-ringed in the male where this is not the 

 case in the female ; the abdominal ornamentation, also, often differs in the two 

 sexes' of the same species. 



Tables of the Species, 

 adults, structure and coloeation. 



1. Proboscis white-ringed in the female 2 



Proboscis at least not completely white-ringed in the female 7 



2. White rings of the tarsal joints broad 3 



White rings of the tarsal joints narrow 6 



3. Femora and tibiae marked with a fine white line on the outside, the femur 



with little white below at the base 4 



Femora and tibiae black without, the femur with much white below at base. 5 



4. Scales on forks of second vein long, narrowly ligulate 



tarsalis Coquillett (p. 230) 

 Scales on forks of second vein shorter, narrowly lanceolate 



duplicator Dyar & Knab (p. 235) 



5. Palpi of the male white at the base of the second and third joints below; 



female with a few white scales at apices of palpi 



stigmatosoma Dyar (p. 236) 

 Palpi of the male marked with white at bases and apices of second and third 

 joints below; female with a white patch at tip of palpi 



euminietes Dyar & Knab (p. 238) 



6. Abdomen with segmental dorsal white patches corniger Theobald (p. 240) 



Abdomen with basal segmental bands 



hassardii Grabham (see corniger, p. 240) 



7. Tarsi with white rings at the bases of the joints 8 



Tarsi with white or pale rings on both ends of the joints 14 



Tarsi without pale rings, unhanded 36 



8. Hind tarsi with broad white rings; thoracic markings silvery (abdomen of 



female with or without dorsal segmental white spots) 



imitator Theobald (p. 430) 

 Hind tarsal rings narrower; thoracic markings, when present, scarcely 



silvery 9 



