Vol. XXVI, pp. 161-166 June 30, 1913 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NINE NEW THYSANOPTERA FROM THE EXITED 



STATES. 



BY J. DOUGLAS HOOD, 



Biological Survey. 



The following species of thrips have not been heretofore 

 described. One is of economic importance and all but two are 

 represented by an abundance of material. 



Scirtothrips niveus sp. nov. 



Female. ---Golor almost white Head about 1.5 times as wide as long, 

 broadest across eyes: cheeks straight and parallel; eyes .6 as long as 

 head, interval twice their breadth. Antenna- about 2.5 times as long as 

 head; segment '■'> pedicellate; segments 1 and -white; 3 white in basal 

 halt', shading to dark gray at lip; 1-8 dark gray, 4 pale at ba«e, 5 pale 

 just beyond the dark pedicel. Prothorax about 1.:'. time- as wide as long, 

 minutely transversely striate ; one short brittle at each posterior angle, 

 f ,.,_r~ colorless. Wing- three times the length of antennae, and about 17 

 time- a- long as width at middle, colorless and almost perfectly trans- 

 parent: anterior vein <>f fore wings with three nearly equidistant white 

 bristles in distal half, posterior vein with two. 



Measurement* or holotype. — Length .99 mm. ; head, length .090 mm., 

 width .138 mm.: prothorax, length .120 mm., width .164 mm.; ptero- 

 thorax, width .216 nun..; abdomen, width .232 mm. Antennal seg- 

 ments: 1, 19m; 2. 36/*; 3, 42/*; 4. 36/*; 5, 33/*; 6, 41/*; 7, 8/*; 8, 14/*: 

 total length of antenna. .23 mm.; width at Moment 4, .018 mm. 



Male.— Slenderer than female. Length .72 mm. 



Described from eleven females and one male taken on the under surface 

 of leave- of Cornus florida L., Plummer's Island, Maryland, May 18, 

 1913, by W. L. McAtee and the writer. 



Thrips varipes sp. nov. 



Female. — Allied P onii Moulton. Color dark blackish brown. 



Head 1.3 times as wide a- long, rather conspicuously cross striate; cheeks 

 rounded; eyes .7 as wide as their interval. Antennae slender, 2.4 times 



42— Pkoc. Biol. Soc. Wash.. Vol. XXVI, 1913. (161) 



