34 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



toothed, although in a simpler manner ; next there are three 

 divisions, as in quinqucfasciatus (fig. 1), 'coniitatus (fig. 2), 

 and dipscticits (fig. 3), but without teeth, and finally four in 

 pipicns. Moreover the plates are of moderate length, none 

 especially elongated or shortened ; all have rounded pointed 

 tips, without any teeth. 



We are not sufficiently acquainted with the European fauna 

 to say whether Culc.v pipicns develops local races or allied 

 species in outlying countries adjoining its range, as quinquc- 

 fasciatns and siinilis, hereinafter discussed, do; but such is 

 probably the case. In America it does not, and this furnishes 

 additional support for the opinion that the species has been 

 introduced comparatively recently into America. 



Culex quinquefasciatus Say. 



This seems to be the earliest name for the widely distributed 

 species called Citle.v fatigans by Theobald. We have prepared 

 mounts of the genitalia of specimens from various parts of 

 North and South America, Hawaii, the Philippines, and India, 

 and find them constant. Theobald's distribution for this species 

 is therefore evidently, in the main, correct. His citation of the 

 North American localities which have been given under the 

 name pungens do not show the exact distribution. In general, 

 the "pungens" from northern localities are either pipiens or 

 restuans, those from points south of Washington are quinque- 

 fasciatus ', although the ranges of the species overlap to. a certain 

 extent. Just how much we do not know. 



Specimens from the moist parts of North America, the 

 southern Atlantic States to Mississippi Valley, and from eastern 

 Mexico have genitalia of the normal form (fig. 1), like those 

 of specimens from the West Indies, Guiana, and Brazil, as well 

 as the Philippines and India. In the arid parts of the' United 

 States and the western coast of Mexico a modified form of 

 genitalia is seen (fig. 3), representing a distinct race of the 

 species. We are not acquainted with the line of separation of 

 the forms, as our material is insufficient. Our specimens of the 

 race, for which we propose the name dipscticus, are from Tndio 

 and Coachella, Cal. (in the Salton Sink), La Paz, Baja Cali- 

 fornia, Acapulco and Salina Cruz, Mexico. On the coast of 

 California the species has become modified to a specific degree, 

 and we characterize it here under the name comitatus (fig. 2). 



In Jamaica we have recognized this species under another 

 name, revocator, because the palpi and the proboscis are more 

 or less distinctly white-tipped. The genitalia arc however, 

 unmodified from the normal quinquefasciatus form, showing 



