48 
Psyche 
[February 
NEW NEOTROPICAL THYSANOPTERA COLLECTED BY 
C. B. WILLIAMS. 
By J. Douglas Hood, 
University of Rochester. 
The present paper brings forward several new genera and a 
number of new species collected by Mr. C. B. Williams during 
his residence in Trinidad from 1916 to 1919 and also during a 
short trip to the Lesser Antilles in March and April 1915. 
It was originally intended by Mr. Williams that the material 
be worked up by us jointly; but my own delay in getting at the 
task until he had been appointed to the distant post of Ento- 
mologist to the Egyptian Ministry of Agriculture has made such 
co-operative work seem inadvisable. During his various visits 
to the United States the systematic position of many of the 
genera and species was worked out by Mr. Williams and ten- 
tative manuscript names assigned. These names have been 
retained except in the case of several of the more interesting and 
conspicuous forms which, I think, are better named after their 
collector in recognition of his exceedingly valuable work on this 
group of insects. 
The following descriptions are preliminary to other papers 
in press or in preparation, and are published at this time in order 
that the worth of this splendid collection — certainly the largest 
ever brought out of tropical America — may not be lessened by 
the otherwise inevitable loss of priority in many of the names. 
The holotypes, allotypes, and a portion of the paratypes 
have most generously been placed by Mr. Williams in my col- 
lection. 
Stomatothrips septenarius sp. nov. 
Female (macropterous) . — Length about 1.4 mm. Color 
testaceous, with head, prothorax, two pterothoracic transverse 
bands (one near middle and one at base), abdominal segments 
3-9, all tibiae and tarsi, and antennal segments 4-9, blackish 
brown; antennal segments 1-3 yellowish white, 4 paler basally; 
fore wings pale gray-brown, with two white cross bands, one 
narrow and at basal sixth, the other wider and at apical seventh, 
