34 NORTH AMERICAN THYSANOPTERA. 



(113) Idolothrips angusticeps Crawford, Pomona College, Journ. Ent., vol. 2, no. 1, 



p. 168, figs., March, 1910. 



Habitat: "Belize; Havana, Cuba; San Marcoa and Chivandega, Nicaragua; 

 Guadalajara, Mex." (Crawford). 



(114) Idolothrips coniferarum Pergande, 1896. Redescribed by Hinds, Mon. 



Thys. N. Amer., Proc. U. S. Nat. Mus., vol. 26, p. 206, figs., 1902. 

 Habitat: Washington, D. C; Amherst, Mass. 

 Taken on Pinus inops, Juniperus virginiana, and A hies sp. 



(115) Idolothrips armatus Hood, Ann. Ent. Soc. Amer., vol. 1, no. 4, p. 285, figs., 



December, 1908. 



Habitat: Carbondale, Havana, Pulaski, and Urbana, 111. 



Taken in galls of Gnorimoschema gallsesolidaginis on Solidago canadensis in 

 miscellaneous and woodland sweepings; on Plantago rugelii. 



(116) Idolothrips tuberculatus Hood, Ann. Ent. Soc. Amer., vol. 1, no. 4, p. 287, 



figs., December, 1908. 

 Habitat: ^\^lite Heath and Boskydell, 111. 

 Taken on white oak. 



40. Genus MEGALOTHBIPS Heeger. 



(117) Megalothrips hesperus Moulton, Tech. Ser. 12, Pt. Ill, Bur. Ent., U. S. 



Dept. Agr., p. 65, figs., 1907. 

 Habitat: Stanford University, California. 

 Food plant: Not known. 



(118) Megalothrips (?) spinosus Hood, Can. Ent., vol. 40, p. 306, figs., 1908. Ref.: 



Ent. News, vol. 20, p. 231, May, 1909. 



Habitat: Hsimsbiirg, Pa.; St. Anthony Park and St. Paul, Minn. 



Taken "in burrows of lepidopterous or coleopterous larvse in dead willow 

 stem," and "under the bark of dead limb of white birch." 



DESCRIPTIONS OF NEW GENERA AND NEW SPECIES. 



[The numbers correspond to the list numbers in the catalogue] 



(2) Orothrips kelloggii yosemitii new variety. (PL II, fig. 9.) 



Measurements: Head, length 0.16 mm., width 0.20 mm. ; prothorax, 

 length 0.16 mm., width 0.25 mm.; mesothorax, width 0,35 mm.; 

 abdomen, width 0.45 mm.; total body, length 1.75 mm. Antennae: 

 1,30 pt; 2,54:fi; 3,99;«; 4, 96/i; 5,63;x; 6,48;^; 7, 45/z; 8,33,«; 9,33/i; 

 total, 0.50 mm. 



Color dark brown to blackish-brown; cheeks not strongly arched. 

 Segment 2 of antennae yellow, dark brown at base; segment 3 yellow, 

 but dark brown in outer half; segment 3 noticeably constricted in 

 the middle; sense areas on segments 3 and, 4 ovoid (in 0. Icelloggii 

 elongate). Spines on hind margin of prothorax short but quite 

 stout; those on mesonotum likewise small. Trochanters not notice- 

 ably yellow. Darkened bands in center and at tip of wings smaller 

 and lighter colored and more irregular than in Orothrips Icelloggii. 



2. Genus ERYTKROTHRIPS new genus. 



Head almost one-tliird longer than wide. Ocelli present in both 

 sexes. Antennae nine-segmented, the last two segments closely 

 joined and together somewhat shorter than segment 7. Maxillary 



