84 



borders. This is quite aptly illustrated by Phytonomus punctatus, Fab., and 

 Hyksinus trifolii Muel.* These entered Ohio first at the extreme northeast 

 corner of the state, and there seems to have been a later introduction by 

 the southeast gateway, the current of the Ohio river carrying them down 

 and landing a colony of each in southeast Indiana and southwest Ohio, 

 thus completely disarranging what had previously seemed very probable, 

 viz : that both of these species would cross northern Ohio and make their 

 first entrance into the state from the northeast. As it is, they will proba- 

 bly not do so, but work to the north and west, the two invasions (a second 

 will probably occur in the northeast) meeting somewhere north of the 

 center, west or southwest of Ft. Wayne. Strange as it may appear, an 

 invasion of foreign or American species starting from Quebec, New 

 England or New York, makes its way westward to the south of the Great 

 Lakes instead of to the north. Therefore, species entering Indiana from 

 Michigan are of rare occurrence. Indeed, I do not know of a single one 

 whose advance can be with certainty traced to such a course. Aphodiw 

 fossor, Linn., may perhaps be an exception, as it is known to have worked 

 southward to Massachusetts from Canada. It was next found at Detroit, 

 Michigan, and I have seen specimens collected about Chicago, while Prof. 

 Wickham reports it from Iowa, he having found it in 1887. There are, 

 however, at present no good collectors in northern Ohio, and it might 

 have followed the usual route along to the south of Lake Erie. 



Invasions have also swept over the state from the west, though not 

 many of these are recorded. Boryphora 10-lineata, Say, an American species, 

 will amply illustrate the fact of there being a current of insect migration 

 from west to east, as well as one taking the reverse course. 



For anything we can now see, this system of currents and counter cur- 

 rents may have thus been going on for ages, and it is fruitless to attempt 



* Note.— Since the above was written, I learn that this species has been reported from 

 northeast Iowa by Mr. Wallace, of Des Moines. Investigation, however, develops the 

 fact tbat this report is based on an injury to clover, supposed to have been done by this 

 beetle. There is no evidence showing that it has been observed in Iowa. Mr. E. A. 

 Schwarz, of Washington, reports it from Df troit, Michigan, and the report is doubtless 

 correct; therefore, it may now occur in extreme northeast Indiana, in accordance with 

 our previous anticipations. I wish also to call attention to the fact that this iDsect, in 

 European catalogues, is placed in the genus Hylastcs, and, so far as known to the writer, 

 has never bee n considered as belonging else whir re. If it belongs to this genus in Europe, 

 it should in the United States, since no striking anatomical changes would follow its 

 transportation from that country to this. If our genera are not in conformity with those 

 of the same name in other countries, then why use a preoccupied name? The idea that 

 this species shall be a Hylasinus in America and a Hyktstcs in Europe, is sheer nonsense 

 and should be corrected, either in one country or the other. 



