INSECUTOK INSCITI^ MENSTRUUS 57 



maidis Beach and afterwards placed in synonymy by Hinds, 

 lives throughout the year on grasses. It would seem that we 

 are here dealing with two distinct species, one of which will 

 ultimately be known as Prankliniella maidis (Beach). 



9. Frankliniella fusca (Hinds). The tobacco thrips. — May 

 18 and 19; two females, on basswood (Tilia americana h.) and 

 mountain laurel (Kalmia latifolia L.). Known from Massa- 

 chusetts, Virginia, District of Columbia, North Carolina, South 

 Carolina, Georgia, Alabama, Tennessee, Texas, and Michigan ; 

 occurs also in New York, Maryland, Pennsylvania, Illinois, 

 Missouri. South Dakota, Kansas, and Nebraska (coll. Hood). 

 Very common on many plants, especially in the flowers ; in- 

 jurious to shade-grown tobacco in the South, causing "white 

 veins." 



10. Frankliniella stylosa Hood (=Euthrips ftoridensis Mor- 

 gan). — April 6-August 18, October 12; abundant on various 

 spring flowers, such as arrow-wood (Viburnum acerifolium 

 L.), fringe-tree {Chionanthus virginica L.), moose-wood 

 (Dirca palustris L.), mountain laurel (Kalmia latifolia L.), 

 and wild yam-root (Disoscorea villosa L.). Described from 

 Plummer's Island and re-described from Florida ; taken also 

 in Virginia, at Great Falls, Dyke, and Four Mile Run, and in 

 Fairfax County directly opposite the island. Morgan's 

 Euthrips floridensis is identical, two paratypes being available 

 for comparison. 



11. Frankliniella tritici (Fitch.) The zvheat thrips. — March 

 30-November 19 ; common on nearly every species of plant 

 examined. Recorded from New Hampshire, Massachusetts, 

 New York, New Jersey, District of Columbia, Florida, Michi- 

 gan, Illinois, Iowa, Texas, New Mexico, Washington, Oregon, 

 California, and Barbados Islands ; occurs also in Maryland, 

 Virginia. Kansas, and Oklahoma (coll. Hood). Probably the 

 most abundant thrips in North America. 



12. Oxythrips divisus Hood. — April 18; several nymphs 

 from scrub pine (Pinus virqiniana Mill.). Very common in 

 April and May on pines in the vicinity of Plummer's Island. 

 Described from Maryland and Virginia. 



