132 ENTOMOLOGICAL, NEWS. [Mar., '16 



the middle of May. The entire life history of this generation 

 of these insects is spent in these galls instead of their being 

 used only as a place of protection during metamorphosis as 

 was surmised to be the case with L. caryac by J. D. Hood 

 (Proc. Biol. Soc. \Yash., XXVII, p. 160)." 



The type will be placed in the U. S. National Museum. 



Differs from Liothrips caryae (Fitch) in color (including 

 that of the antennal joints), size, length of wings and the 

 longer prothorax ; the larva is quite different in color. It 

 should perhaps be given specific rank, but its characters and its 

 ecological relationships are in many ways so similar to those 

 of L. caryae that it seems best to give it only subspecific rank. 



The following key modified from that of Moulton (1911) 

 will enable one to separate the North American species of Lio- 

 thrips. 



I. Head about 1.3 (or less) times as long as wide. 



a. Fore wings brownish at the extreme base ; tube .8 or .9 as long 

 as head. 



b. Head 1.15 times as long as wide; marginal abdominal 

 spines yellowish; usually only segment 3 of antennae 

 all clear yellow. 



c. Black ; postocular bristles blunt, .6 times as 

 long as eye; fore wing with about 14 hairs of 

 a second row ; antennal segments 5 and 6 

 mostly blackish brown to black, 



L. occUatus, Hood 



cc. Postocular bristles sharp-pointed and almost 

 as long as eye ; fore wing with 17-22 inter- 

 located hairs ; antennal segment 5 yellowish. 

 d. Color brown or black; length about 

 2 mm. ; wings long ; prothorax .6 

 times as long as head ; antennal seg- 

 ments 6-8 blackish brown, 



L. caryae (Fitch) 



dd. Color brown to yellow with much 

 deep red pigmentation; length about 

 2.6 mm.; wings reaching only about 

 75 the length of the abdomen ; pro- 

 thorax .9 times as long as head ; an- 

 tennal segments 6-8 yellowish brown, 

 L. caryac floridcnsis, n. sub. sp. 



