924 THE ENTOMOLOGIST. 
fourth segments, and much shorter simple ones near the apex of the 
fifth and sixth segments externally. For coloration see above. 
Prothoraz about one-fifth longer and wider than the head. One 
long stout inwardly curved spine on the hind margin near the lateral 
end; a pair of slightly shorter spines between these; a short stout 
Fic. 1.—Antenna of (a) Sericothrips gracilicornis ; (b) S. bicornis ; 
and (c) S. Staphylinus. 
forwardly directed inwardly bent spine at each front angle, four fairly 
long spines in a row just behind the front margin; six or eight of 
similar length in a slightly irregular row across the middle of the 
pronotum and one other on each side between this row and the long 
posterior marginal spines. Pterothorax normal. Legs fairly long 
and slender, used for jumping. Wings fully developed (in the two 
female specimens known), broad at the base, then narrowing by the 
