210 THYSANOPTERA AND ORTHOPTERA. 



forever, Sedum purpureum; in flowers of nightshade, Solarium dulca- 

 mara, and of common potato, S. tuberosum; among florets of golden- 

 rod, Solidago canadensis; in flowers of nodding ladies' tresses. Spiranthes 

 cernua; in flowers of linear-leaved loose-strife, Steironema quadrifiorum; 

 among florets of tansv, Tanacetum vulgare; in flowers of linden, Tilia 

 americana; among florets of red clover, Trifolium pratense, and of white 

 clover, T. repens; in and among flowers of mullein, Verhascum thapsus; 

 in tassels, in bunches of young leaves, among husks, and at bases of 

 older leaves of field corn. Zea mays. 



Euthrips fuscus Hinds. — This is a shorter insect than the preceding, 

 and is of a brownish yellow color, and much more sluggish. It does 

 not fly, its wings being exceedingly short. It is found in more or less 

 protected situations in grasses and flowers. In other regions, I have 

 taken it much more abundantly in various grasses, but nearly always 

 in concealed places. 



Taken July 31 to August 20. 



Habitat. Sifted from blue grass, Poa pratensis; among florets of 

 dandelion. Taraxacum officinale. 



Ctenothrips bridwelli FrankUn. — This is a large, black thrips, not 

 as readily put to flight as many species, but a \'igorous flier once it takes 

 to wing. It is very spiny, and lives on exposed leaf-surfaces. 



Taken July 28. 



Habitat. On both upper and under surfaces of leaves of false lily- 

 of-t he- valley, Maianthemum canadense, and of star-flowered Solomon's 

 seal, Smilacina stellata. 



Anaphothrips striatus (Osborn). — This species is found chiefly on 

 grasses, often in wholly exposed situations. It is a little smaller than 

 the commonest species, Euthrips tritici, is of a clouded yellow color, and 

 does not leap. Males are exceedingly rare, and the female is known to 

 be parthenogenetic. 



Taken at intervals from June 24 to August 21. 



Habitat. Upper side of leaves of sea sand-reed, Ammophila arenaria; 

 among buds and on young leaves of burdock, Arctium minus; upper 

 and under side of leaves of common oats. Arena sativa; upper side of 

 leaves of barnyard grass, Echinochloa crusgalli; upper side of leaves of 

 nodding wild rye, 'Elymus canadensis; swept from blue grass, Poa pra- 

 tensis; on leaves of ])lackl)erry, Ruhus canadensis; on leaves and husks 

 of field corn, Zea mays. 



Aptinothrips rufus (Gmelin). — This is a very sluggish, wingless 

 species found only in grass. Often when collected it is found in the 

 soil at the bases of the grass, l)ut some careful investigations which I 

 have made show that it'is probably always in or on the grass, and only 

 drops to the ground, when disturl^ed. It is yellow, and is quite slender. 



