CATALOGUE. 21 



of' . Average length about 3.3 mm.; color black, antennal segments 3 to 5 yellow 



at bases; tarsi blackish brown (115) Idolothrips armatus Hood. 



3. Wings large, powerful, brown at base; median vein brown, prominent, and extend- 

 ing to middle of wing; fore wings double fringed behind for about 

 40 hairs (116) Idolothrips tuberculatus Hood. 



(40) Genus Megalothrips Heeger. 



1. Color dark brown, with orange or red pigment; all tibiae and tarsi shaded with 



yellowish; bases of antennal segments 3-6 lemon-yellow. 



(117) Megalothrips hesperus Moulton. 



2. Color nearly uniformly black, excepting tarsi, which are blackish brown. 



(118) Megalothrips spinosus Hood. 



CATALOGUE OF NORTH AMERICAN THYSANOPTERA. 

 1. Genus OROTHRIPS Moulton, 1907. 



(1) Orothrips keUoggii Moulton, Tech. Ser. 12, Pt. Ill, Bur. Ent., U. S. Dept. 



Agr., p. 45, figs., 1907. 



Habitat: Santa Cruz Mountains, central California. 



Taken in blossoms of manzanita {Manzanita manzanita) and madrona 

 (Arbutus menziesii) in March and April. 



(2) Orothrips keUoggii yosemitii new variety. (For description see p. 34.) 



Habitat: Yosemite Valley, Cal. 



Taken in blossoms of wild lilac (Ceanothus sp.?) at an altitude of 6,000 

 feet, in June and July. 



2. Genus EBYTKROTHRIPS new genus. 

 (Described on page 34.) 



(3) Erythrothrlps arizonse new species. (For description see p. 35.) 



Habitat: Phoenix, Ariz.; Oroville, Cal. 



Taken in orange and olive blossoms in Arizona, by Mr. J. Eliot Coit, 

 and on Rhamnus purshiana at Oroville, Cal., by ]Mr. B. B. Whitney. 



3. Genus AITKOTHBIPS Crawford. 



(4) Ankothrips robustus Crawford, Pomona College, Journ. Ent., vol. 1, no. 4, p. 



100, figs., 1909. 



Habitat: Claremont and Los Gatos, Cal. 



Taken on California laurel (Umbellularia cali/ornica) and California lilac 

 (Ceanothus sp.?) at an altitude of 5,000 feet. 



4. Genus .ffiOLOTHRIPS HaHday. 



(5) .ffiolothrips bicolor Hinds, Mon. Thys. N. Amer., Proc. U. S. Nat. Mus., vol. 



26, p. 130, figs., 1902. 



Habitat: Amherst, Mass. 



Food plants: Brunella vulgaris, Panicum sanguinale, bindweed, and varioxia 

 grasses in mowings. 



(6) ffiolothrips vespiformis Crawford, Pomona College, Journ. Ent., vol. 1, no. 4, 



p. 109, figs., 1909. 

 Habitat: Managua, Nicaragua. 

 Food plant not known. * 



