6Q INSECUTOR INSCITI^ MENSTRUUS 



tial points indicated by me, and finds them insufficient for even 

 racial separation. Apparently the former connection between 

 the old and new worlds was by way of Alaska, and this species, 

 inhabiting the west of America, has not differentiated itself 

 in the two areas. The synonymy may presumably be accepted, 

 as follows : 



Anopheles maculipennis Meigen. 



Anopheles maculipennis Meigen, Syst. Besch. Zweif. Ins., i, 11, 



1818. 

 Anopheles occidentalis Dyar & Knab, Proc. Biol. Soc. Wash., xix, 



159, 1906. 

 Anopheles leiuisi Ludlow, Psyche, xxvii, 74, 1920. 

 Anopheles selengensis Ludlow, Psyche, xxvii, 77, 1920. 



Our eastern A. quadrimaculatus Say is a distinct species, 

 while our A. barber i has a representative species in the Euro- 

 pean A. plumbeus Steph. The distribution of both of the 

 American species is distinctly more disconnected from the north 

 than that of A. maculipennis, and the differentiation is corre- 

 spondingly greater. Our species A. walkeri Theo. and 

 A. atropos D. & K. are not referred to by Mr. Edwards, but are 

 probably derivatives of the same stock. A crucians Wied. and 

 A. punctipennis Say may not be of holarctic origin. 



Genus Uranotaenia Lynch A. 



The species cited from the Mediterranean region and Japan 

 are wholly unrelated to the North American forms, showing 

 that this genus reached us from the south. 



Genus Culiseta Felt 



Only one of the species is common to the new and old worlds, 

 C. alaskacnsis Ludlow, which has a western distribution with 

 us. Edwards finds sibcriensis Ludl. and arctica Edw. to be 

 synonymous, and the distribution to include all of northern 

 Asia and Europe, Siberia, Archangel, Sweden and Scotland, 

 as well as the Alpine regions of Austria and Upper Silesia. 

 A description of the larva was given by me (Ins. Ins. Mens., 

 vii, 33, 1919). 



