4 University of MicJiigan 



ing migration. These facts lend new support to the hypothesis 

 of palaearctic origin and eastward spread, and we may now 

 predict with some degree of confidence that these species will 

 be found in Alaska and throughout the breadth of Canada. 

 There is room for doubt, however, regarding one of the spec- 

 ies of the subjoined list, Pithanus maerkelii, the occurrence 

 of which in North America was unsuspected until 19 15 when 

 Olsen* reported its discover}'^ on Long Island, N. Y. In 1916 

 I found it in material from Maine and Nova Scotia^, and now 

 from southern Vancouver Island we again meet with numerous 

 examples identical with those found in the east. Present 

 knowledge of this fonn does not preclude the opinion that 

 it has been introduced by commerce and is in process of es- 

 tablishment near sea ports, but, on the other hand, it may be 

 in fact a holarctic species, and the matter will be decided only 

 when further collections from the interior are available for 

 study. The following palaearctic species appear in the collec- 

 tions under consideration : — 



Corisus crassicornis Calocoris norvegicus 



Aradiis Ingiihris Poeciloscyttis nnifasciatiis 



A. cinnauioineus Capnts atcr 



Ny silts th villi Lygns pratensis 



N. ericae L. canipcstris 



Sphragisticus nchiilosus Campylomma verbasci 



Scolopostethus thomsoni Limnoporus rufosciitellahis 



Nabis ferns 



Miris dolabratiis ? Ischnorrhynchus resedae 



Stenodema trispinosum ? subsp. franciscanus 



Pithanus maerkelii ? Mecomma amhidans 



Stenotus binotatus ? subsp. gilvipes 



*Capsid New to our Fauna, Bull. Brooklyn Ent. See, Vol. lo, igiS- 

 ^New and Noteworthy Hem. N. E., Ent. News, Vol. 27, 1916, PP- 104-10S. 



