1901 ENTOMOLOGICAL SOCIETY. 67 



is no perceivable difference between the Dynastes tityus that breeds in the southern portions of 

 Illinois, Indiana and Ohio, and those found some distance up the Hudson River in New York. 

 The same is also true of the Bag Worm, Thyridopteryx ephemerajormis, which along the sea 

 coast extends northward to Massachusetts, and in the west it has been sent me from within 

 twenty-five miles of Lake Erie, though it is but fair to say that this was in case of a single sack, 

 the species not occuring abundantly north of Columbus, in this State, and, until quite recently, 

 it was not to be found even that far north, yet there is no apparent difference between Ohio 

 . and Massachusetts specimens, so far as I have been able to learn. The chinch bug, Blissus 

 ^ leucopterus, may, perhaps seem to offer an exception in its abbreviated wings along the shores of 

 the Atlantic, but as we have the same phenomenon in the same species on the Pacific coast, it would 

 seem that it is due to maritime influences. If one will take almost any study of the distribution 

 of our species of insects and examine it closely, he will be surprised at the number that extend 

 their habitat south into Centra^ and South America, and will get the impression that many of 

 our species really extend from the tropical countries northward, instead of from north to south, 

 as it is usually given by our systematists. A good illustration is afforded by a recent " Review 

 of the Tettigonida? of north America, north of Mexico," by Mr. Elmer D. Ball, who, after the 

 common usage, gives the species as occuring from its northernmost known home south when in 

 the cases of 19 out of 26 species considered, this statement should have been reversed. These 

 illustrations only convey a limited idea of the wealth of material awaiting the student of the 

 origin of our insect fauna. 



There remains only one more tide of insect migration to consider and that from the north to the 

 southward. Mr. Schwarz* has given two exceedingly good illustrations of this, one, 

 Aphodius nifipes, which occurs all over Europe and Siberia, but in North America only in the 

 Alleghany mountains ; the other a Carabid, Nomius pygmn'us, which is found in Oregon and Wash- 

 ington, Lake Superior, Ottawa, Canada, Nova Scotia, and on the high mountains of North Caro- 

 lina. Our commonest lady beetle, Megilla maculata, is found as far south as Chili, though at sea 

 level, a large and developed variety occuring in the Amazon district oi South America. f Our 

 Fyrameis hunteri has also been taken in Peru, at an altitude of 9,803 feet above the sea. The 

 White Mountain Butterfly, CEneis semidea, as is well known, occurs in the White Mountains of 

 New Hampshire, Labrador, and on the high mountains of Colorado. There are other equ-illy 

 interesting illustrations of this southward trend of arctic and boreal species, but I have not time 

 to enumerate them. I will close this paper, however, by a significant statement made by Dr. 

 Henry Skinner in the Canadian Entomolorjid of October, 1893, as follows: "In the species 

 that fly from the Atlantic to the Pacific, and also exist in Europe, it will be found that the 

 Pacific coast examples far more closely resemble European ones than those individuals found 

 on the Atlantic slope." 



THE IMPORTED WILLOW AND POPLAR CURCULIO. 



Cryptorhynchvs lapathi Linn. 



By F. M. Webstek. 



My reason for treating this insect at considerable length at this time is, that it has passed 

 "the Alleghany Mountains and entered the middle west, having been found the present autumn 

 near Ashtabula, in the extreme northeastern Ohio, by one of my assistants, Mr. A. F. Burgess, 

 acting under my direction. Previous experience with imported insects that have made their 

 way to the west, led me to believe that we should sooner or later find it in Ohio, and that it 



* Proc. Ent. Soc, Washington, Vol. I,, p. 186. 

 t Travels Among the great Andes of the Equator, Appendix, p. 57. 



