172 Psyche [December 



than half a century. I therefore suggest the following as a satis- 

 factory arrangement of our North American forms of Lasius:^ 



Genus Lasius Fabr. 



Subgenus Lasins Fabr. { = Donisthorpea Morice and 

 Durrant) 

 niger L. var. sitkaensis Pergande. 

 Var. neoniger Emery. 

 Subsp. alienus Forster var. americanus Emery. 



Subgenus Formicina Shuckard ( = Chthonolasius Ruzsky) . 

 flavus L., subsp. nearcticvs Wheeler. 



Subsp. claripennis Wheeler (in MS.). 

 brevicornis Emery. 



Subsp. microps Wheeler (in MS.). 

 umbratvs Nylander subsp. suhumbratus Viereck. 



Subsp. mixtiis Nyl. var. aphidicola Walsh. 



Subsp. vestitvs Wheeler. 



Subsp. speculirentris Emery. 



Subsp. minutus Emery. 

 humilis Wheeler (in MS.) 



Subgenus Acanthomyops Mayr. 

 claviger Roger. 



Subsp. subglaber Emery. 

 interjedus Mayr. 



Subsp. mexicanus Wheeler. 



Subsp. coloradensis Wheeler (in MS.). 



Subsp. arizonicus Wheeler (in MS.). 



Subsp. californicus Wheeler (in MS.). 

 occidentalis Wheeler. 

 murphy i Forel. 

 latipes Walsh. 



Postscript. 



Since the preceding article was sent to the Editor of Psyche, I 

 have received from Professor Emery a paper (Formiche d' Italia 

 nuove o critiche. Rend. R. Accad. Sc. 1st. Bologna 12 Marzo, 



iThe subgenus Dendrolasius, which should include besides the subgenotype L. fulifjinosut, 

 the peculiar Japanese L. spathepus Wheeler, is confined to Eurasia and is therefore omitted. 



