ON NEW GENERA OF THYSANOPTERA FROM VENEZUELA. 329 



On two New Genera of Thysanoptera from Venezuela : Anactinothips and 

 Actinothrips. By EiCHARD S. Bagnall. (Commnnicated by the Rt. Hon. 

 Lord Ayebury, B.C., F.R.S., F.L.S.) 



(Plate 46.) 



[Read 6tli May, 1909.] 



When travelling in Venezuela in the year 1891 Dr. Meinert, of Copenhao-en, 

 made a small collection of Thysanopterous insects which he has kindly 

 submitted to me for examination. Though poor in individuals the collection 

 is unusually rich in species^ and, owing to the difficulty! have experienced in 

 satisfactorily tabulating certain genera, I have not yet been able to work out 

 the whole material, but amongst those examined are two large and interestino- 

 species, each forming the type of a new genus, the subjects of this short paper. 

 Both species were collected by Dr. Meinert at the same time and in the same 

 place, and though each bears a strong superficial resemblance to the other it 

 will be seen that the genera are in reality widely separated, Anactinotlirips 

 naturally falling into the Phloeothripid group, and ActinotJmps into the 

 Idolothripid group of the Tubulifera. 



In working out these species I have attempted, though imperfectly, to 

 figure an organ, or series of organs, of doubtful function (PL 46. fig. 7a'). 

 This organ apparently exists in all species of Thysanoptera, and is found at 

 the base of the femur near the line of union with the trochanter, takino- the 

 form of a thinly chitinized area, or areas, of varying shapes. It was first 

 discovered in the Thysanoptera by Dr. Trybom"^", and suggested to him the 

 auditory organs found in the tibiae of certain Locustidce. 



It should be mentioned that the figure of the fore-tarsus of Anactinothips 

 (fig. 6) is taken from a mounted specimen in which the less stronglv chitinized 

 part of the foot (i. e., the fore-part) has lost its original form. 



In expressing my gratitude to Dr. Meinert I have pleasure in namino- one 

 of the species in his honour. 



Order THYSANOPTERA. 



Suborder Tubulifera. 

 Genus AnactinothripSj nov. 



Head twice as long as the prothorax and three times as long as the breadth 

 immediately behind eyes; vertex slightly produced beyond eyes. Cheeks 

 strongly widened at posterior third and set with a few short, stout spines. 

 Mouth-cone broadly rounded, reaching more than halfway across prosternum. 



* Entomologisk Tidskrift, xvii. 1896, pp. 102-4. 



