THYSANOPTERA AND ORTHOPTERA. 211 



Its slow crawling is often almost a wormlike movement. It has a 

 variety connaticornis Uzel which has only six segments in the antenna 

 instead of eight but is otherwise like the typical insect. 



Taken June 24 to August 24. 



Habitat. Found only on blue grass, Poa pratensis, or swept from 

 mixtures of grasses containing blue grass. 



Thrips tabaci Lindeman. — Next to Euthrips tritici, this is the most 

 abundant species in the region studied. It may usually be distin- 

 guished at sight from the female of Euthrips tritici by its smaller size 

 and paler color, the orange or brownish tinge being wanting. From 

 the males of Euthrips tritici, it often cannot be distinguished without 

 microscopic examination. Both species are found in the same kinds 

 of places, namely, concealed situations almost anywhere on plants, but 

 chiefly in flowers. Both are active species, and fly on slight provoca- 

 tion. 



Taken July 7 to August 22. 



Habitat. Among florets of common white yarrow, Achillea mille- 

 folium; among petals and sepals of water plantain, Alisma plantago- 

 aquatica; among leaves and seeds of tumble-weed, Amaranthus grae- 

 cizans, and of rough pig- weed, A. retroflexus; in terminal bunches of 

 young leaves of ragweed, Ambrosia artemisiifolia; among, not in, the 

 flowers of pearly everlasting, Anaphalis margaritacea ; among florets of 

 dogfennel, Anthemis cotula; in flowers of spreading dogbane, Apocynum 

 ondrosaemifolium; among buds and florets, and on very young leaves, 

 of burdock, Arctium minus; in flowers of common milk-weed, Asclepias 

 syriaca; among florets of large-leaved aster, Aster macrophyllus, and of 

 flat-top white aster, A. umbellatus; in flowers of American sea-rocket. 

 Cakile edentula; in and among flowers of button-bush, Cephalanthus 

 occidentalis; among florets of young heads of green foxtail, Chaetochloa 

 viridis; in flowers, near base of corolla, of snake-head, Chelone glabra ; 

 among florets of common thistle, Cirsium lanceolatum; inside of flower 

 and on inner side of stamens of hedge bindweed. Convolvulus sepium; 

 in flowers of swam]) loose-strife, Decodon verticillatus; upper side of 

 leaves and in heads of nodding wild rye, Elymus canadensis; in flowers 

 of great willow herb, Epilobium angusti folium ; among ray florets of 

 sweet scabious. Erigeron annuus;' a.nd of daisy fleabane. E. ramosus; in 

 flowers of treacle mustard. Erysimum cheiranthoides: among buds of 

 boneset, Eupatorium perfoliatum, and among florets of trumpet-weed. 

 E. purpureum: in flowers of small-flowered gerardia, Gerardia pauper- 

 cula; and of false fox-glove, G. pedicularia; among rays of woodland 

 sunflower, Helianthus divaricatus; among florets of Canada hawk weed. 

 Hieracium canadense; among florets of cylindric l)lazing-star. Liatris 

 cylindracea, in flowers of butter-and-eggs, Linaria vulgaris; in and 



