26 NORTH AMERICAN THYSANOPTERA. 



16. Genus SCOLOTHRIPS Hinds. 



(37) Scolotlirips sexmaculatus Pergande. Redescribed by Hinds, Mon. Thys. 



N. Amer., Proc. U. S. Nat. Mus., vol. 26, p. 157, figs., 1902. 



Habitat: Missouri; Ames, Iowa; Lincoln, Nebr.; Baraboo, Wis.; Honolulu, 

 Oahu, Hawaiian Islands. 



Taken on beans, blackberry, elm, and hop (Beach). 



Note. — "Found on many plants infested with red spiders, on which it has 

 repeatedly been observed to feed" (Pergande). "Feeding on mites in fold 

 of Cottonwood leaf" (Bruner). Specimens of thrips sent by Mr. David 

 Fullaway from the Hawaiian Islands are larger and darker in color than as 

 given in Hinds's description and all of the dark spots on the wings are enlarged 

 to bands. 



17. Genus SCIRTOTHHIPS ShuU. 



(38) Scirtothi-ips ruthveni Shull, Eut. News., vol. 20, p. 222, figs.. May, 1909. 



Ilabitat: Huron County, Mich. 



Food -plants: Terminal clusters of dogwood {Cornus stolonifera) . 



18. Genus EUTIiPvIPS Targioni-Tozzetti. 



(39) Euthrips orchidii Moulton, Tech. Ser. 12, Pt. Ill, Bur. Ent., U. S. Dept. Agr., 



figs., 1907. 



Ilabitat: Fruitvale, Alameda County, Cal.; Brussels, Belgium (Bagnall). 



Taken in flowers of orchids in greenhouse in California and on Chamsedorea 

 fragrans, Ficaria, and palms in Belgium, by Mr. Bagnall. 



(40) Euthrips parvus new species. (For description see p. 38, PI. IV, figs. 23-25.) 



Habitat: San Francisco, Cal. 



Food plants: Various hothouse plants. 



(41) Euthrips citri Moulton, Tech. Ser. 12, Pt. VII, Bur. Ent., U. S. Dept. Agr., 



ills., 1909. (The orange thrips.) 



Habitat: Orange districts on eastern foothills of San Joaquin Valley, 

 southern California; Phoenix, Ariz. 



Taken from citrus trees and thistle (?) in San Joaquin district; from 

 orange in southern California; from nightshade (by Mr. P. R. Jones) in 

 Phoenix, Ariz. 



Note. — This is a very destructive pest in some of the orange districts of 

 California, the injury being done in the retarding and deforming of the new 

 growth of foliage and in the marking (scabbing) of the oranges. 



(42) Euthrips albus new species. (For description see p. 39, PI. Ill, figs. 20-22.) 



Habitat: Red Bluff, Cal. 

 Taken on peach-tree foliage. 



(43) Euthrips pyii Daniel, Ent. News, vol. 15, p. 294, November, 1904. Redescribed 



by Moulton, Tech. Ser. 12, Pt. Ill, Bur. Ent., U. S. Dept. Agr., p. 53, figs., 

 1907; Bui. 68, Pt. I, Bur. Ent., U. S. Dept. Agr., figs., ills., 1907; Bui. 80, 

 Pt. IV, Bur. Ent., U. S. Dept. Agr., figs., ills., 1909. (The pear thrips.) 



Habitat: Counties around San Francisco Bay, central California, north to 

 Sacramento, south to Hollister; Berkhamsted, Hertford County, England. 



Food plants: Deciduous fruits, including almond, apple, apricot, cherry, 

 fig, grape, peach, pear, plum, prune, English walnut. Blossoms of wild jjlum 

 in England. 



(44) Euthrips ehrhornii Moulton, Tech. Ser. 12, Pt. Ill, Bur. Ent., U. S. Dept. 



Agr., p. 54, figs., 1907. 



Habitat: San Jose and Saratoga, Cal. 

 Taken on grass and on foliage of prune treea. 



