230 
Psyche 
[December 
NEW NEOTROPICAL THYSANOPTERA COLLECTED BY 
C. B. WILLIAMS. IP 
By J. Douglas Hood, 
University of Rochester. 
The earlier paper of this series was published in Psyche, Vol. 
XXXII, pp. 48-69, 1925, and made known five new genera and 
thirty-six new species. During its preparation several doubt- 
fully distinct forms belonging to difficult genera were reserved 
for further study. Thesee — leven in number — and one new 
genus, are described below. Two are named after their col- 
lector, whose careful field work has done much to increase our 
knowledge of the Thysanoptera of tropical America. 
The holotypes, allotypes, and a portion of the paratypes 
will remain in the collection of the author. 
Sericothrips williamsi sp. nov. 
Female (macropterous ) . — Length about 1.0 mm. Color 
yellow, paler by reflected light, with head, fore coxae, metascu- 
tum, and a narrow basal band (wider laterally) on ter git es 2-6 
of abdomen, brown; pronotal blotch conspicuous by reflected 
light, invisible by transmitted light, lateral margins straight and 
parallel, anterior margin roundly, and posterior margin sub- 
angulately, concave; antennae with segment 1 white; 2 and 3 
gray, the latter darkened just beyond pedicel; 4-8 dark blackish 
brown, 4 and 5 with a light spot near base; legs yellow, with mid 
and hind femora brown at apex and mid tibiae brown at base; 
fore wings grayish brown shading to nearly white in apical 
portion and pale also just beyond scale, darkest in scale and just 
beyond the subbasal pale band. Mouth cone long and slender, 
decidedly surpassing base of prosternum, heavily chitinized, la- 
brum nearly black apically. Antennae noticeably long and 
Contributions from the Entomological Laboratories of Cornell University. 
