FROM THE DERWENT VALLEY 663 



at apex; and eighth narrowing to tip. Relative lengths: — 

 9 : 14 : 17 : 16 : 16 : 15 : 16 : 10. Sense-cones long and acute. 



Head rounded distally, widened slightly from behind eyes 

 to base ; slightly longer than width behind eyes, and one and 

 one-third times the length of the prothorax. Ocelli absent. 

 Mouth-cone blunt at tip, much shorter than width at base, 

 and scarcely reaching one-half way across the prosternum. 

 Space between eyes great ; postocular bristles placed near side 

 margins of head and rather well back. 



Prothorax transverse, twice as broad as long; bristle at 

 each posterior angle long, half as long as the prothorax, and 

 twice as long as the bristle at each anterior angle. Other 

 bristles probably present, but indistinct in the type specimen. 

 Pterothorax only very slightly broader than the width across 

 the fore-coxae, and almost as long as broad ; metathorax 

 evenly and gently narrowed to base of abdomen. Wings 

 absent. Fore-cox^ with a long faintly knobbed bristle ; fore 

 legs rather short and broadened ; intermediate and hind 

 femora swollen, and tibia short and stout; hind and inter- 

 mediate tibiae with a long bristle on the outer side near tip. 

 Intermediate pair the shortest. 



Abdomen as broad as the pterothorax, narrowing gently 

 from the sixth segment. Segments strongly transverse, and 

 bristles exceptionally long ; those on ninth segment very 

 slender, and at least one and one-half times as long as the 

 tube. Tube short and stout, and two-thirds the length of the 

 head, twice as long as broad at base, and only slightly 

 though evenly narrowed distally ; terminal hairs long and 

 slender, like those on the ninth segment, at least one and one- 

 half times as long as the tube. 



Male with a pair of long slender spines on the ninth 

 sternite, and a shorter and stouter spine at each hind angle. 



Habitat. — A single male taken in moss, Gibside, 1907. 



This is the species referred by me* with some little doubt to 

 Uzel's Trichothrips ccespitis, to which species it is somewhat 

 closely allied, but quite distinct as will be seen from the above 

 description. 



• Eiitomologisl't MtntUly Magazine, 2ud series, xix., pp, 3-?, 1808. 



