NO. 2008. NEW SPECIES OH" THYSAN0PTERA—3I0RGAN. 35 



smaller, shorter spines. Tip of tube bears six spines, which are not 

 so conspicuously blunt as the preceding. Tube two-thirds as long as 

 the head, its sides straight; at the tip about three-fifths as broad as 

 at the base. Hairs at the tip very nearly as long as the tube. 



Described from six females, 1 type, 5 paratypes. 



Locality, Quincy, Florida, May 15, 1910. 



On Hypericum dolahriforme. 



G. A. Runner and A. C. Morgan, collectors. 



This species is provisionally placed m Trichothrips, since the wings 

 are rather broader apically than is typical of the genus. 



Type.— Cat. No. 15736, U.S.N.M. 



GASTROTHRIPS Hood.^ 



In my collection are a male and female of Gastrothrips rujicauda 

 Hood, the type-species of this genus. An examination of the male 

 suggests the following emendation of the generic description: Male 

 with the fore femora considerably thickened, the fore tarsi armed 

 with a stout tooth, a scale at the base of the tube. 



GASTROTHRIPS RUFICAUDA Hood. 



Male. — Newly discovered. Agrees very closely in coloration with 

 the type, somewhat more slender, and is slightly smaller than the 

 female in my collection. Measurements: Length 1.35 mm.; head, 

 length 0.183, width 0.183; prothorax, length 0.175, width (mcluding 

 coxae) 0.35; pterothorax, width 0.35; abdomen, width 0.375; tube, 

 length 0.15, width at base 0.075, width at tip 0.033; greatest width 

 of fore femur 0.125; length of antennal segments in microns: 1-36; 

 2-52; 3-60; 4-52; 5-52; 6-48; 7-40; 8-36. The fore femur is about 

 one and one-half times as broad as that of the female, the fore tarsus 

 is armed with a stout tooth the length of which is about half the 

 width of the fore femur, a conspicuous scale at the base of the 

 tube. The fore angles of the mesothorax are produced laterally into 

 a sharp tooth-Hke process. 



The measurements of the female in my collection are as follows: 

 Length 1.46 mm.; head, length 0.183, width 0.208; prothorax, 

 length 0.142, width (inclusive of coxae) 0.40; pterothorax, width 

 0.333; abdomen, width 0.467; tube, length 0.168, width at base 

 0.080, width at tip 0.40. Length of antennal segments in microns 

 as follows: 1-40; 2-54; 3-64; 4-58; 5-56; 6-56; 7-40; 8-40. 



HORISTOTHRIPS, new genus. 



Head longer than wide, rectangular viewed from above, front 

 truncate, not produced in front of eyes; cheeks slightly roughened 

 and bearing small spines not on warts; eyes large, finely facetted; 



' Proc. Ent. Soc. Wash., vol. 14, No. 3, pp. 156. 



