312 T. D. A. cockp:rell. 



diately adjacent might show other differences than those due to 

 altitude. 



Thirty-six Coleoptera were found and identified in the sub-alpine 

 zone, and of these twenty-two, or nearly two-thirds, were not found 

 in the mid-alpine. These include the following eleven genera not 

 found in the mid-alpine : Pityophagus, Batyle, Ditylus, Badider, 

 Serica, Diabrotica, Tomicns, Polypkylla, Euryomia, Lisirus and Des- 

 maris. Of the thirty-six species, one only, Hippodamia convergens, 

 was observed to range up to the high-alpine. 



Of fourteen Orthoptera from the sub-alpine of Custer County, not 

 a single species was found also in the mid-alpine. Of twelve sub- 

 alpine genera the following eight are not mid-alpine : Mermiria, 

 Hadrotettix, Q^dipoda, Scyllina, Acrldium, Dissoteira, Mestohregma 

 an d Pli iUbostroma. 



Thus, in both Coleoptera and Orthoptera, the difference between 

 the two zones is seen to be very marked, not only as to species, but 

 also as to genera, showing that we have to deal with distinct faunte. 



With the Rhopalocera, so far as my observations went, the differ- 

 ences were by no means so marked. Many species of butterflies 

 undoubtedly fly over a considerable range of altitude, and I was 

 convinced in Wet Mountain Valley that a number of individuals 

 of Dancm jylexippus, Coli.as eurytlieme, etc., were to be caught at 

 altitudes a good deal above where they had been bred. But however 

 this may be, several species certainly range right up from the sub- 

 alpine to the high-alpine, — such are Phyciodes camillus, Nathalis iole, 

 Lhnenitis weidemeyerii and Colias eurytheme. 



Of course there are also many sub-alpine species which do not 

 range upwards in this manner. Mr. Nash kindly gave me much 

 information about his captures, extending over several years, and 

 the following, among others, were all taken by him in Pueblo County: 

 Colias c(jesonia Stoll., Phyciodes picta Edw., Grapta interrogationis 

 Fab., Satyrus alope Fab., Limenitis disippus Godt., Puphia troglodyta 

 Fab., Thecla melinus Hiib., T. siva Edw., Lyaeiia alee Edw., Niso- 

 niades alpheus Edw., Eudamus tityrus Fab., and PampJiila cernes B. 

 and L. The last-mentioned species was taken at Rye. 



ZOOLOGICAL REGIONS. 



Dr. C. H. Merriam has lately (Proc. Biol. Soc. Washington, April, 

 1892) i)ublished a new Bio-geographic map of North America, in 

 which he adopts an arrangement of faunal regions different from 



