94 The Rocky Mountain Locust. 



put forth a few secondary blossoms after the insects left, 

 and a few small apples were noticed on such in autumn. 



TIME OF APPEARANCE OF INYADIXG SWARMS. 



In endeavoring to deduce general conclusions respect- 

 ing the time of year that the 1874 swarms reached different 

 parts of the country, great difficulty was experienced in 

 sifting those accounts which referred to the progeny of 

 the 1873 invasion, and those which hatched within the 

 insect's native range, and came from the extreme North- 

 west. The same was true of the fresh 1876 swarms, and 

 those which hatched in Minnesota. Yet we shall find, as 

 a rule, that the insects which hatch outside of what is 

 designated further on as their native habitat — i. e., in 

 Minnesota, Iowa, Missouri, and the larger part of Nebraska, 

 Kansas and Texas — acquire wings and leave before the 

 fresh swarms from the mountain region appear. In the 

 more northerly of the States, as in Minnesota, the insects 

 hatched on the ground in ordinary seasons acquire wiugs 

 in June, and earlier in proportion as we go south, until 

 in Texas they become fledged in April. The time of appear- 

 ance of the new swarms is in inverse ratio : i. e. } earlier 

 in the more northern, later in the more southern States- 

 Thus, while on the confines of the insect's native habitat, 

 it is almost if not quite impossible to distinguish between 

 the old and the new comers, in respect to the time of 

 their acquiring wings, the difference in this respect be- 

 comes greater the farther south and east we go. In 1874, 

 swarms appeared during June in Southern Dakota; during 

 July in Colorado, Nebraska and Minnesota ; during the 

 latter part of this month in Iowa and Western Kansas. 

 During August they came into Southeast Kansas and Mis- 

 souri ; and by the middle of October they reached Dallas, 

 in Texas. In 1876 they came later. 



