52 INSECUTOR INSCITIi^ MENSTRUUS 



0.396 mm. ; tube, length 0. 1 74 mm., width at base 0.079 mm., at apex 

 0.041 mm. Antennal segments: 1, 36j«; 2, length 51j«, width 28//; 

 3, length 69//, width 27//; 4, length 63/t, width 26/(; 5, length 63//, 

 width 25//; 6, 5l/«; 7, 45/«; 8, 35//; total length 0.41 mm. 



Male : Very close in color and structure to the female, from which it 

 differs principally in the more slender head ; fore tarsi absolutely unarmed. 



Described from 2 1 females and 24 males, taken by Mr. James Zetek 

 from the under surface of leaves of Hura crepitans L., on Taboga Island, 

 Panama, October 18, 1913. According to Mr. Zetek they were very 

 common in the vicinity of certain leaf galls, and he suggests that the thrips 

 may have been concerned in their formation. 



One female and nine males differ from the other specimens of the spe- 

 cies in having the hind coxae and femora dark brown instead of white. 

 Structurally the two forms appear identical and at present seem not to 

 deserve special names. 



Holopothrips tenuis, new species (fig. 2). 



Femzile: Length about 2.2 mm. Color nearly uniform dark blackish 

 brown, with coral red hypodermal pigmentation in head, prothorax, and 

 abdomen ; cintennae, tarsi, thorax, and apical half of tube slightly paler. 



Head about 1 .6 times as long as wide, broadest across eyes ; cheeks 

 almost pcirallel ; dorsal and lateral surfaces with close transverse striae and 

 a few minute bristles ; postocular bristles capitate, three-fourths as long as 

 eyes. Eyes large, prominent, reniform, less than half as long as head, 

 almost enclosing the ocelli, nearly contiguous below anterior ocellus, pro- 

 duced inwcird behind the posterior ocelli to near the median line, the 

 interval at this point about one-fourth the greatest width of eye. Ocelli 

 closely approximate and anterior in position. Antennae slender, about 

 1.7 times as long as head and 2.7 times its width; segment I about as 

 wide as long ; 2 subcylindrical, about twice as long as wide ; 3-5 clavi- 

 form, pedicellate, the former about 3.4 times as long as greatest width 

 and with a very narrow pedicel ; 6 and 7 subfusiform, truncate at either 

 end ; 8 nearly 0.6 as long as 7, slender, narrowed at base ; sense cones 

 and spines slender, nearly transparent. Color of antennae : Segments I 

 and 2 nearly concolorous with head, 2 paler along middle ; 3-8 brown- 

 ish drab to almost yellow, the bases of 3-5 and all of 7 and 8 darker. 

 Mouth cone about two-fifths as long as dorsum of head and about as 

 wide as long. 



