38 INSECUTOR INSCITI^ MKNSTRUUS 



aa. Tenth abdominal segment less than twice as long as segment 

 9, conical, 

 b. Sixth antennal segment with a transverse suture on lower 

 surface; tenth abdominal fully 1.5 times as long 



as median dorsal length of ninth divisus Hood 



bb. Sixth antennal segment not divided; tenth abdominal 

 segment subequal in length to ninth, 

 c. Segments 1 and 2 of antennae pale, 3 slightly 



darker ajug<B Uzel 



cc Segment 1 of antennae pale, 2 much darker, 3 



pale ulmi (Bagnall) 



II. Posterior angles of prothorax with two pairs of long bristles,^ 



(Subgenus CtEnothrips nov.) 

 d. Head narrowed anteriorly. 



e. "End of second and whole of third antennal joint 

 yellowish, fourth greyish yellow" ... /irwfMj (Uzel) 

 ee. "Antennal joints 3 to 8 uniform dark grey or greyish- 

 black" brevicollis Bagnall 



dd. Head narrowed posteriorly cric^ (Haliday) 



Oxythrips bicolor (Reuter), 1878. 



1878. Thrips (Bclothrips) bicolor Reuter, Ofv. Finska Vetensk.- 



Soc. Forh., Vol. XXI, p. 221. 

 1895. Belothrips brcvistylis Trybom, Ent. Tidskr. [Vol. XVII, 



p. 185. 

 1895. Oxythrips hastaia Uzel, Monogr. d. Ordn. Thys., pp. 134, 



455, PI. V, fig. 66. 

 1895. Oxythrips hastata var. bicolor, idem, ibidem. 

 1899. Oxythrips brcvistylis, Reuter, Acta Soc. Fauna Flora Fen- 



nica, Vol. XVII, No. 2, p. 46. 



1911. Oxythrips brcvistylis, Bagnall, Journ. Econ. Biol., Vol. VI, 

 pp. 5, 10. 



1912. Oxythrips brcvistylis, Bagnall, Journ. Econ. Biol., Vol. 

 VII, p. 191. 



1912. Oxythrips hastata var. bicolor, Schille, Ent. Zeitschr., Jahrg. 



XXV, p. 236. 

 1914. Oxythrips brcvistylis, Priesner, Wien. Ent. Zeit., XXXIII 



Jahrg., p. 190. 

 1914. Oxythrips brevistylis var. hastatus, idem, ibidem. 



Distribution: Finland, Sweden, Austria, England, 

 European students have uniformly disregarded Reuter's 

 name bicolor, which has priority over both brevistylis and 



'The key to the species of this subgenus is based on those of Uzel (1. c.) and 

 Bagnall (1. c), one species only {ericae) being known to the author. 



