INSECUTOR INSCITI^ MENSTRUUS 73 



There is no such peculiar development in Europe of the 

 maculatus-fitchii series as gives rise to our species grossbecki 

 D. & K. and squamiger Coq. The southern distribution of 

 these is significant of long separation. 



Group thibaulti 



Unrepresented in Europe. Again note the southern distri- 

 bution of our species. 



Group trichurus 



The European representative is A. rusticus Rossi. The rela- 

 tionship is very obvious, but not very close. In this case the 

 American form is the more primitive of the two, trichurus not 

 showing the peculiar development of the hairs of the basal lobe 

 of the side-piece which are so marked in rusticus. 



The peculiar A. lepidonotus Edw., with scales on the post- 

 notum, is unrepresented with us. 



Group innuitus 

 Mr. Edwards places both innuitus and nearcticus as synonyms 

 of alpinus; but he recognizes also another species, which he 

 names parvulus. A reexamination of my material convinces 

 me that these two species are both circumpolar, occurring to- 

 gether, with the following synonymy: 



Aedes alpinus Linnaeus. 



Culex alpinus Linnaeus, Flora Lapp., ed. 2, 381, 1792. 

 Culex nigripcs Zetterstedt, Ins. Lapp.. 807 1838. 

 A'cdes innuitus Dyar & Knab, Ins. Ins. Mens., v, 186, 1917. 

 AMes n. sp. Dyar, Rep. Can. Arc. Exp., iii, Pt. C, 33, 1919. 

 Ochlcroiaiiis nigripes Wesenberg-Lund, Mem. Acad. Roy. Sci. 

 & Lett. Danemark (8), viii, pi. ix, 1921. 



As Stated by Edwards, the male hypopygium is heavily 

 chitinized, the aedoeagus looking like a pair of strong forceps ; 

 the apical lobe is very small ; the claspette-filament has a single 

 narrow membranous expansion. The basal lobe is commonly 

 furnished with even, long hairs, thickening progressively toward 

 the margin, in some specimens the last one or two forming 

 moderately strong spines. The larva has the anal segment 

 ringed, the pecten of the air-tube with detached teeth. The 



