5O ENTOMOLOGICAL NEWS [Feb., '15 



Prothorax little more than half as long as head, one and one-half 

 times as wide as long, sides diverging posteriorly ; a rather weak spine 

 on each posterior angle ; no other conspicuous spines. Mesothorax 

 nearly rectangular in outline but the sides slightly converging pos- 

 teriorly, anterior angles very sharp. Mctathorax with nearly parallel 

 sides. 



Legs slender, concolorous with the body, except the tarsi which are 

 lighter, bearing a number of short but rather stout spines. Each 

 femur has one long spine on the anterior margin one-fourth of the 

 distance from the proximal end; posterior tibia with one rather long 

 spine and a stout tooth on the anterior distal end ; on the middle tibia 

 the spine is less conspicuous and on the fore tibia both spine and 

 tooth are still less conspicuous. 



Wings nearly reaching the end of the abdomen ; anterior pair notice- 

 ably constricted below the middle, fringed with long hairs which are 

 nearly together towards the end of the wing, otherwise very evenly 

 spaced; from three to six (usually five) hairs of a double row present. 

 Hind wings very similar and nearly as large, but no constriction or 

 double row of hairs. 



Abdomen rather long, tapering gradually from about the third 

 somite ; first three somites entirely free of spines ; from the fourth on 

 there is a short spine about two-thirds of the distance along the mar- 

 gin which becomes progressively longer on the posterior somites, 

 which also bear two or three shorter spines. Tube rather long, sides 

 converging to one-half the width of the base at the apex. 



$ . Similar to the female except for the weaker and especially 

 narrower abdomen. Total length 1.23 mm. Most of the measure- 

 ments are from seven to fifteen per cent, less than those of the fe- 

 male except segments 3-8 of the antennae. 



Larvae. The very young larvae are straw yellow in color, except 

 the last three or four somites of the abdomen which are reddish 

 brown and the antennae which are dark brown. As the larva becomes 

 older the entire abdomen becomes reddish brown and the thorax de- 

 velops brown blotches. The eyes are dark red. 



Described from numerous females and several males and 

 larvae. 



Habitat. Among the needles of pine trees, where they are 

 quite common. Found on both young trees and large ones 

 which had just been felled. Gainesville, Florida, January to 

 April, 1914. 



Heterothrips aesculi, n. sp. (PI. II, figs. 5-f>). 



9 . Color very dark brown, black by reflected light. Total length, 

 .9 to i.o mm.; head, .06 mm. long (exposed part), .15 mm. wide; pro- 



