18 



THYSANOPTERA AND ORTHOPTERA. 207 



r a. Length of abdomen not more than twice its breadth. 



17. i Trichothrips beachi, p. 213. 



I b. Length of abdomen phiinly more than twice its breadth. (18). 



a. Wingless. Opaque bhick. Trichothrips hrevicruralis, \^. 2\S. 



b. Winged. Black species are more or less transparent. (19). 

 [ a. Fore-wings not narrowed in middle. Trichothrips triden- 



19. i tatus, p. 214. 



lb. Fore- wings narrowed in middle. Genus Anthothrips (20). 



r a. Postocular bristles always well developed. Prominent spines 



! at anterior angles of prothorax. Anthothrips rerhasci, p. 213. 



■ 1 b. Postocular bristles usually wanting. Anterior angles of pro- 



I thorax without spines. Anthothrips niger, p. 213. 



List of Species. 



The brief descriptions of species given in this hst are intended merely 

 to indicate the general appearance of the insect in its natural habitat. 

 The colors are those seen by reflected light only. Thus, many species 

 appear black by reflected light, whereas under the miscroscope with 

 transmitted light they are brown. For descriptions of species suffi- 

 ciently complete for identification, the reader is referred to the works 

 of Hinds (1902), Hood (1908), Frankhn (1907), and Shull (1909). 



The term "habitat" is used, in accordance with the best modern 

 usage, to mean the character of the place inhabited by a species, not 

 the state, country, or region where it has been collected. For the 

 latter, the term "range" or "pro\dnce" should be used. Lender the 

 heading "habitat" is given every species of plant and the part of the 

 plant on which each species of thrips was captured. This is done, not 

 because the species of plant is important in itself, but because the 

 character of the habitat is in this way most accurately described. The 

 scientific name of the plant is given, except in the case of one or two 

 common cultivated forms. The names are those used in Gray's 

 Manual (7th edition, 1908), and the authority for the names has there- 

 fore been omitted. 



The species of thrips are here arranged in what is supposed to be 

 approximately their natural order, the most specialized last. The ar- 

 rangement is based largely on the degree of fusion of the segments of 

 the antennae and palpi ; the fewer the segments the greater the special- 

 ization. 



Aeolothrips fasciatus (Linn.).— This species is comparatively large, 

 as thrips go. The female is deep brown, the male much paler. There 

 are three conspicuous white bars on the wings. The insect is quite 

 active, and belongs among the interstitial species. 



Taken at intervals from June 24 to August 18. 



