IOWA ACADEMY OP SCIENCES. 199 



none seventeen years ago. " Eden township, " None. " Jeffer- 

 son township, "None within thirty-four years to my knowl- 

 edge." Clayton county, Giard township, "None this year; a 

 few seventeen years ago." 



Brood XIII. — Professor Riley (1st Ann. Kept. State Eatomol- 

 ogist of Mo.) mentioDS this brood as occurring along the 

 southern border of Iowa, but does not specially define its limits. 

 The 1878 occurrence was studied by Professor Bessey and the 

 data collected enabled him to define the limits of the brood with 

 considerable exactness (Amer. Entom., N. S. Vol. I, p. 27). 



According to this record they occurred in the following 

 counties: Van Buren, Davis, Wayne, Decatur, Des Moines, 

 Henry, Jefferson, Wapello, Monroe, Union, Louisa, Keokuk, 

 Mahaska, Marion, Warren, Madison, Adair, Cass, Iowa, Powe- 

 shiek, Jasper, Polk, Dallas, Marshall, Story, Boone, Greene, 

 Hamilton, and they were assumed to occur in the counties 

 embraced within the area encompassed by these, Clarke, Appa- 

 noose, Ringgold, Washington, Johnson, as indicated on his map, 

 outline of which is shown. (Plate XV.) 



On the recurrence of this brood last season (1895) I published 

 requests in a number of state papers and also obtained from 

 students and others, data covering as much territory as possi- 

 ble. Tne responses to the published requests were not so 

 general as could be wished. In some cases many reports com- 

 ing from the same locality, while a number of counties, where 

 they must have occurred, furnished no reports. 



Taking the counties reported in their order from the eastern 

 border of the state they run as follows: Louisa, Keokuk, 

 Poweshiek, Tama, Marshall, Story, Webster, Boone, Dallas, 

 Madison, Union, Decatur, and for counties within the outer 

 limits, Polk, Jasper, Marion, Monroe, Wapello, Jefferson, Van 

 Buren, Lee. 



The counties within this area which must, in all probability, 

 have been visited, are Warren, Mahaska, Lucas, Wayne, Appa- 

 noose, Davis, Washington, Henry, Des Moines, while the 

 doubtful ones are Johnson, Iowa, Hamilton, Greene, Guthrie, 

 Adair, Ringgold. 



Reports from Iowa and Johnson are quite positive as to 

 their non-appearance in those counties, though it is possible 

 our informants could speak for only a part of the area. There 

 is also a probability that they occurred in Hamilton county, 

 close to the Des Moines valley at least, if not in the Skunk. 



