HABITS OF THE EUROPEAN BLISSUS DORIA. 83 
between the two forms and the limited distribution of the short- 
winged form inland might open the way to a solution of the mystery. 
The writer believes that the insect is primarily a tropical macrop- 
terous species, and that it has followed the coast from South America 
along the Gulf and Atlantic northward to Cape Breton, and along 
the Pacific coast to San Francisco and possibly beyond; also that it 
spread from northern Mexico and Texas northward as far as Winni- 
peg, subsisting upon the native grasses, and in the meantime spread- 
ing also to the eastward to northern Indiana and Ohio. 
} On the other hand, from the Atlantic coast there has originated a 
tide of diffusion the trend of which has been westward, the bugs 
here partaking more of the nature of their seashore ancestors, more or 
less of them being of the short-winged form, which their less nomadic 
habit has served to further emphasize. This tide of diffusion has en- 
countered what the western tide did not, at least until much later, 
namely, the timothy meadows of the Caucasian agriculturist, and, 
adapting itself to this food 
plant, has held closely to it, 
thus avoiding the necessity 
of seasonal migration. In 
northeastern Ohio and pos- 
sibly in northern Indiana 
and northern Illinois the | 
western tide of diffusion 
has met the eastbound tide 
and is perhaps amalgamat- 
ing with it. (See map, 
fig. 1%, iustrating sup- Fig. 18.—Blissus doria: a, first nymph; ec, second; b, third; 
posed direction of diffusion d, fourth. (From illustrations prepared in the Bureau 
of chinch bug.) ren gees 
Although not at all conclusive evidence, it might be added that the 
single specimen taken at Winnipeg by Doctor Fletcher was of the 
macropterous form, while the single example taken by Mr. Van Duzee 
at Muskoka, Canada, was of the brachypterous form; and this, with 
the fact that the specimens from the island of Grenada were of the 
_former and the Florida coast specimens of the latter exclusively, 
shows that latitude and climate have no effect. 
> 
HABITS OF THE EUROPEAN SPECIES, BLISSUS DOR FERR. 
Prompted apparently by a review of one of the writer’s papers 
read before the eighth annual meeting of the Association of Economic 
Entomologists at Buffalo in 1896, Prof. Karl Sajo, formerly of the 
Kg. Ung. Staatliche Entomologische Versuchsstation, at Budapest, 
published a short paper on “Unser Blissus doriw,” * which is so full of 
4 Tilustr. Wachenschrift ftir Entomologie, Vol. II, pp. 449-451, July 18, 1897. 
