208 THYSANOPTERA AND ORTHOPTERA. 



Habitat. In flower of hedge bindweed, Convolvulus sepium; in flowers 

 of pumpkin, Cucurbita pepo; swept from blue grass, Poa pratensis; 

 among florets of heal-all. Prunella vulgaris; among florets of goldenrod, 

 Solidago canadeyisis; and in heads of white clover, Trifoliutn repens. 



Heterothrips salicis 8hull. — This insect is of moderate size, black, 

 and of sluggish habits. It is apparently one of the superficial species. 



Taken at two places, on July 14. 



Habitat. On outside of catkins, not among the florets, and on the 

 leaves of the pine-cone gall, of the ^^^llow, Salix flmnatilis. 



Chirothrips manicatus Haliday. — This species is of moderate size, 

 and deep brown to black in color. It is usually more or less concealed 

 (interstitial), but occasionally exposed (superficial). It is never very 

 active. 



Taken from June 24 to August 16. 



Habitat. Among chaff scales of common oats, Avena sativa; among 

 seeds in head of redtop, Calamagrostis ca^iadensis; in flowers of hare- 

 bell. Campanula rotundifolia; in flowers of beach pea, Lathyrus mariti- 

 mus; on upper side of leaves of tall millet grass. Milium effusum; among 

 florets of timothy, Phleum pratense; swept from blue grass, Poa pra- 

 tensis; in heads of white clover, Trifolium repens; and at bases of leaves 

 of field corn, Zea mays. 



Scirtothrips ruthveni Shull. — This is a pale yellow species of rather 

 small size. It lives in moderately exposed situations, and, although it 

 leaps if disturbed, it is not nearly so agile as Thrips tabaci, which it 

 resembles in general form and color. Anaphothrips striatus, which also 

 resembles this species in a general way, does not leap at all. Only the 

 females are known. 



Taken in three localities, July 9 to July 15. 



Habitat. Among terminal leaves of dogwood, Cornus stolonifera; on 

 the leaves and in the flowers of the linden, Tilia americana; and among 

 the florets of red clover, Trifolium pratense. 



Euthrips tritici (Fitch).- — ^This is one of the commonest of all the 

 species found here. If a medium-sized thrips of yellowish color, per- 

 haps tinged with orange or brownish, issues from any concealed place, 

 as from a composite flower, and crawls rapidly away or at once takes 

 to flight, the chances are many to one that it is Euthrips. tniici. The 

 males are abundant also. So far as food plants are concerned, this 

 species seems to be but little restricted, as the list below will show. 



Taken June 24 to August 21. 



Habitat. Among florets of white yarrow, Achillea millefolium; in 

 flowers of alfalfa ; in tufts of young leaves of ragweed. Ambrosia artemisi- 

 ifolia; in flowers of anemone. Anemone canadensis; among ray florets of 

 dogfennel, Anthemis cotida; among young buds and florets of burdock, 



