Vol. XXIX, pp. 109-124 June 6, 1916 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF NEW THYSANOPTERA. 

 BY J. DOUGLAS HOOD. 



Eleven new species of Thysanoptera are described below. Of 

 these, eight are from the United States and one each from Cuba, 

 Panama, and Southern Nigeria. A new genus is also erected 

 for an odd species from Virginia and Maryland. All types are 

 in the collection of the author. 



The writer must express his obligations to Lt.-Col, Sir David 

 Prain, Director of the Royal Botanic Gardens at Kew, England, 

 for securing the determination of the food plant of the new 

 Physothrips from Southern Nigeria; to Prof. Patricio Cardin, of 

 the Estacion Experimental Agronomica at Santiago de las 

 Vegas, for material of the new Cuban species; and to the several 

 other collectors who have contributed most of the specimens on 

 which these studies are based. 



/Colothrips annectans sp. nov. 



Female (macropterous). — Length about L5 mm. Color dark blackish 

 brown, with a reddish cast, due to crimson hypodermal pigmentation in 

 the thorax, abdomen, and femora; antennae with segment 3 and basal 

 half of segment 4 pale yellowish white, the remainder of antennae black- 

 ish brown. 



Head about one and one-fourth times as wide as long, about equal in 

 length to prothorax, not transversely striate, and with a few minute 

 spines on occiput and cheeks; anterior margin straight, not at all emargi- 

 nate by a forward prolongation of tlie eyes and without median tubercle ; 

 cheeks slightly swollen. Eyes less than half as long as head and about 

 0.6 as wide as their interval, prolonged as usual on ventral surface of 

 head, and with the more dorsal facets separated by a distance much less 

 than their own diameters. Ocelli more than twice the diameter of facets 

 of eyes, nearly equidistant. Antennae about 2.75 times as long as head, 

 rather stout ; segment 3 about 1.27 times as long as 1 and 2 combined and 



26— Proc. Biol. Soc. Wash.. Vol. XXIX, 1916. (109) 



