1 88 PROCEEDINGS OF THE NATIONAL MUSEUM. 



jWi 

 I Wi 



Wings always present, usually inhal)iting flowers 5 



■ings usually reducied, usually inhabiting bark or turf 7 



( Cheeks without spine-bearing warts lniIiofhrip!< ( p. 188) 



I Cheeks with spine-bearing warts 6 



f Fore feniora with teeth at tip within, intermediate antennal segments un- 

 usually long and slender Acanthothrrps ( p. 198) 



Fore femora without teeth in female and usually in male, intermediate 



antennal segments not elongated Phlaothrips (p. 195) 



K, / Head verv large, rounded in front Cephaloihrips (p. 194) 



I Head small, narrowed in front Malacotlmps ( p. 200) 



j Head more than twice as long as wide Idolothrlps (p. 206) 



^ \ Head less than twice as long as wide < 'rtiptoilmps ( p. 205) 



Genus ANTHOTHRIPS Uzel. 



Head but little longer than wide, rounded in front; cheeks nearly 

 parallel, without warts. Antennje neaidy twice as long- as the head. 

 Ocelli and wings always present in both sexes. Wings narrowed in 

 the middle. Mouth cone not longer than the breadth at its base; 

 labruni narrowed toward tip but not sharply pointed. Fore tarsi 

 armed with a tiny tooth which is somewhat larger in males than in 

 females. Males without a scale at base of tube. 



The two species belonging here may be easily separated by the 

 presence or absence of spines upon the head. In A. niger (p. 188) 

 the cheeks are smooth, without spines, and there are no post-ocular 

 spines, while in .1. verbascl (p. 189) the cheeks bear small spines not 

 standing on warts and the post-ocular spines are well developed. 



ANTHOTHRIPS NIGER (Osborn). 

 Plate VII, figs. 72-75. 



Phloeothrips nigra Osborn, Canad. Entom., XV, 1883, p. 154; Kept. U. S. Dept. 



Agr. for 1887, (1888), pp. 163, 164; Ins. Life, I, 1888, pp. 137-142; Ins. 



Life, V, 1892, pp. 112-113.— Davis, Bull. 116, Mich. Agr. Exp. Sta., 1894, 



pp. 62, 63. 

 Anthothr'tps nigra Uzel, Mon. d. Ord. Thysanoptera, 1895, p. 242. 



Feviale. — Length 1.5 mm. (1.1 to 1.8 mm.); width of mesothorax 

 0.34 mm. (0.3 to 0.1 mm.). General color more or less dark reddish 

 brown. 



Head approximately as long as broad, longer than prothorax, 

 smoothl}" rounded in front; cheeks straight, parallel, and without 

 warts. Eyes small, finely faceted; ocelli quite large and well sepa- 

 rated, posterior ocelli almost contiguous with margins of e3^es; no 

 post-ocular bristles. Mouth cone shorter than its breadth at base and 

 blunt at tip. Antennae subapproximate, as long- as width of meso- 

 thorax; segments quite short and stout; fourth thickest and most 

 rounded; relative lengths of seg-ments as follows: 



1 _2_ _3_ ^ _5_ 6 j^ _8_ 

 6 10.3 12.3 12.9 11.5 10.7 10.6 7.4 



