580 



ward and in tlie subsaline [insects*] there are some close alliances with 

 tlie [insects] of the steppes of Siberia. And along the crests of high 

 mountain-ranges, the arctic-alj)ine [insect-fauna] has sent southward more or 

 less numerous representatives through the whole length of the country '' 

 (p. 10). He then refers to the astonishing similarity of the flora of the 

 Atlantic United States with that of Northeastern Asia. (_)ur actual knowl- 

 edge of the insect-species of Northeastern Asia is most vague compared 

 with that of tlic l)otanist, and the comparison we have drawn relates only to 

 generic types. 



SPECIES COMMON TO TEMPERATE AMERICA AND EUROPE. 



Eupithecia absynthiata. ' Hydria undulata. 



Plemyria fluviata. Triphosa dubitata. 



Hydriomena trifasciata. Carsia paludata. 



sordidata. Operhoptera boreata. 

 Petrophora prunata (normal form). Thamnonoma wavaria 



testata. brunnearia. 



Ochyria designata. Cymatophora crepuscularia. 



ferrugai'ia. Anagoga pulveraria. 



Rheumaptera unangulata. Eugonia alniaria. 



In the following list, the Colorado species are included in the Pacific, 

 province : 



SPECIES COMMON TO THE ATLANTIC AND PACIFIC PROVINCES. 



Eupithecia miserulata. Petrophora hersiliata. 

 Glaucopteryx caesiata. prunata (vars.lugubra- 



magnoliata. ta and nubilata. ) 



Plemyria fluviata. testata. 



multilineata. populata. 



Hydriomena californiata. Ochyria munitaria. 

 Petrophora truncata. lignicoloraria. 



* Dr. LeConte bas noticed tlie similarity of our saline-plaius Coleoiitcra, comprising so many 

 species of Tencbrionidw, to the f.ama of the deserts and steppes of Asia. (Proc. Anier. Assoc. Adv. Sci., 

 IH.'Jl, Albany mcetin"-, 2.')2.) He also states that "the only manner in -which the insect fauna of Cali- 

 fornia approaches that of Europe is in the great abundance of apterous Tenebnoiiida-. But in this 

 respect it does not differ from a large part of South America ; and by the very form of these Tenehrio- 

 ni(te, which bear no resemblauce .at all to those of Euroije, the greater relation of the Californian fauna 

 to that of the rest of America is clearly proved." 



