64 INSECUTOR INSCITI^ MENSTRUUS 



occurring also in Missouri, Maryland, District of Columbia, 

 and Virginia (coll. Hood). 



57. Idolothrips armatus Hood. — July 13; one female, taken 

 by sweeping grass. Previously known only from Illinois, 

 where it is often abundant in old galls on golden rod {Solid- 

 ago) ; occurs also in Maryland and Virginia (coll. Hood). 



SUPPLEMENTARY LIST 



The following species have been taken in the vicinity of the 

 island : 



1. Molothrips vittipennis Hood. — May 9 ; one male, taken 

 on leaf of hickory, near Plummer's Island. Previously known 

 from Illinois and the District of Columbia. 



3. Frankliniella ivilliamsi Hood. — November 1 ; both sexes 

 in abundance between the husks of standing and freshly cut 

 Indian corn, at Georgetown, District of Columbia. Known also 

 from Virginia. 



3. Odontothrips pictipennis Hood. — May 19 ; one female 

 (the unique type) from flower of Azalea nudiflora L., at Great 

 Falls, Virginia. 



4. Cephalothrips yuccce Hinds. — Both sexes abundant at all 

 seasons on Yucca filamentosa, near Plummer's Island. Previ- 

 ously known from Massachusetts, District of Columbia, Flor- 

 ida, Tennessee, and Barbados. 



5. Zygothrips harti Hood^ (=^ Z. femoralis Morgan-). — 

 June 8-29; three females taken under dead bark of sumac 

 (Rhus sp.) and by sweeping grass, near Plummer's Island. 

 Recorded from Texas, Tennessee, Illinois, Virginia, and Mary- 

 land. 



6. Hoploihrips corticis (De Geer). — November 1; both 

 sexes under bark on dead willow branch, Rosslyn, Virginia. 

 Described from Europe, and recorded in North America from 

 Massachusetts, Connecticut, New York, and Illinois. 



7. Hoplothrips beachi (Hinds). — November 1; both sexes 

 under bark on dead willow branch, Rosslyn, Virginia. Re- 



"Proc. Biol. Soc. Washington, Vol. XXVI, p. 168; June 30, 1913. 

 »Proc. U. S. Nat. Mus., Vol 46, p. 40, figs, 76-79; August 23, 1913. 



