genera Liothrips and Hoodia. 473 



Liothrips hradecensis, Bagnall, Journ. Econ. Biol., vi, 1911, 

 p. 1 {vitio tyimg.). 



Length of body in ^ 27-3 mm. ; in % 3'3-3'8 mm. 



Black-brown to black. Only the fore tibiae and the apices of the 

 intermediate and hind tibiae and all tarsi yellow. Antennae yellow, 

 only the two first, the two last, and often also the apices of fifth and 

 sixth joints dark. 



Head about half as long again as broad. Cheeks distinctly con- 

 vergent posteriorly, very finely granulate and with several short, fine 

 hairs ; a long, stout bristle on each side behind the eyes, no such 

 bristle in front. Mouth-cone rather long, reaching beyond the middle 

 of the prosternum, at first laterally acute-angularly convergent, but 

 apically distinctly rounded. Antennae about twice as long as the 

 head ; third joint as long as the first and second together ; fourth 

 joint as long as the third ; all the following each shorter than the 

 preceding one ; eighth joint as long as the first. 



Prothorax about half as long as the head, half as broad again as 

 long, distinctly widened backwards ; all bristles present and fully 

 developed. Fore femora scarcely thickened. Fore tarsi without 

 tooth. Pterothorax scarcely longer than broad. Wings extending 

 to the apex of the sixth abdominal segment, of equal breadth through- 

 out, the median vein often brownish. Forewings at the extreme 

 base brownish and there furnished with three long, stout bristles ; 

 on the distal part of the hind margin 15-20 cilia are duplicated. 



Wing retaining spines on second to sixth segments slender and 

 weak, those on seventh still weaker and shorter than on the pre- 

 ceding ; two on each side of each segment, the anterior very small 

 and weak, about the middle of the segment, the posterior quite close 

 to the hind margin ; laterally from each of these a long, stout bristle, 

 and then another, rather shorter and straight. Tube rather longer 

 than the prothorax; its basal breadth is about one-third of its length 

 and almost twice its apical breadth ; the adjacent scale basally 

 apparently withered {^). 



Piercebridge, near Darlington, and Gibside, co. Durham, 

 England. On leaves of elm. Bagnall leg. 



The colour of the antennae and of the legs in Hoodia 

 hagnalli is similar to that of Ziofhrijis hradecensis. The 

 shape of the head is the same as in Liothrips scticollis ; * 

 it is laterally distinctly convergent posteriorly, but in 

 L. hradecensis (also in Hoodia austriaca) almost parallel, 



* The detailed description of this new species is reserved for future 

 publication. 



112 



