212 THYSANOPTERA AND ORTHOPTERA. 



among flowers of. water hoarhound. Lycopus a mericanus; in flowers of 

 white sweet clover, Melilotus alba, and of yellow sweet clover, M. 

 officinaHs; in and among flowers of peppermint, Mentha piperita; among 

 buds and flowers of pale wild bergamot, Mcnarda mollis; in and among 

 flowers of catnip, Nepeta cataria; in corolla tubes of common evening 

 primrose, Oeriothera biennis; in flowers of ditch stone-crop, Penthonim 

 sedoides; in flowers of cultivated pea, Pisum sativum.; swept from tim- 

 othy, Phleimi pratense, and blue grass, Poa pratensis; in and among 

 florets of water persicaria. Polygonum amphihiurn; in and among flowers 

 of pickerel weed, Pontederia cordata; among young terminal leaves, 

 especially on the dorsal side of those still curled up, of balsam poplar, 

 Populus balsamifera; among petals of silvery cinquefoil, Potentilla ar- 

 gentea, and in flowers of rough cinquefoil, P. monspeliensis; on bases of 

 petals, beneath stamens, of swamp rose, Rosa Carolina; above bases of 

 petals and among carpels of broad-leaved arrowhead, Sagittaria lati- 

 folia; in flowers of hemlock water-parsnip, Simn cicutae folium; in flowers 

 of nightshade, Solanum dulcamara, and of common potato, S. tubero- 

 sum; in flowers and on upper side of bases of leaves of goldenrod. Soli- 

 dago canadensis; in flowers of nodding ladies' tresses, Spiranthes cernua; 

 in flowers of wood sage, Teucrium canadense, and of hairy germander, 

 T. occidentole; in and among flowers of mullein, Verbascum thapsus; 

 among buds of blue vervain. Verbena hastata; in tassels, among terminal 

 leaves on young stalks, among husks and silks, and at bases of older 

 leaves of field corn, Zea mays. 



Thrips physopus Linnaeus. — This species is larger and darker than 

 its congener, T. tabaci, its color being practically black. It is exceed- 

 ingly active; one can scarcely touch the flower in which it lives wdthout 

 driving it forth. It takes to flight at once, and is a good flier. 



Taken July 7 to August 15. 



Habitat. Among petals and sepals of water plantain, Alisma plan- 

 tago-aquatica; in flowers of swamp milkweed, Asclepias incarnata; in- 

 side corolla of field pumpkin, Cucurbita pepo; in flowers of swamp loose- 

 strife, Decodon verticillatus; in flowers of Kalm's St. John's Wort, Hy- 

 pericum kalmianum; among small terminal leaves of spotted touch- 

 me-not, Impatiens bifiora; in and among the flowers of cardinal flower, 

 Lobelia cardinalis; in flowers of ditch stone-crop, Penthorum sedoides; 

 in and among florets of water persicaria. Polygonum amphibium; among 

 curled terminal leaves of balsam-poplar, Populus balsamifera; in flowers 

 of hemlock water parsnip, Sium. cicutae folium; among florets of dande- 

 lion. Taraxacum officinale; in heads of white clover, Trifolium repens. 



Baliothrips basalis Shull. — This is a comparatively large thrips, black 

 with a white bar across the thorax, due to the white basal areas on the 



