ON THYSANOPTERA FROM THE WEST INDIES. ' 495 



On a Collection of Thjsanoptera from the West Indies, with Descriptions 

 of new Genera and Species. By Richard S. Bagnall, F.L.S. 



(Plates 48 & 49 ; and 2 Text-fig-ures.) 



[Read 19th November, 1914.] 



Some recent small collections of Thysanoptera from the "West Indies have 

 proved highly interesting, producing snch, noteworthy forms as Corynoihnps, 

 Williams, and jDinurothrips, Hood, the former described from St. Vincent 

 and the latter from Porto Rico. 



This present paper deals with a collection made by the Government 

 Entomologist, Mr. Urich, in Trinidad, and though the species are few, yet 

 they are of very considerable interest. Out of eleven species but six 

 represent previously known forms, and of these FranUinieUa nwlanommata 

 has but recently been described (Dec. 1913) by Willinms, whilst the Neo- 

 tropical forms Dicaiothrips hrricollis, Bagn., Z>. brevicornis, Bao-n., and 

 Eupatliitlirips s'llve.strii (Buffa) are not well known. All the new forms 

 are striking species, and I have found it necessary to erect three new 

 genera — Sedulothrips (to which we must also refer Hood\s Polyommatotlmps 

 vigilans), Craniothrips, and Ckirothnpoides. The latter is erected for an 

 anomalous and peculiar form, the type of a new division of the Tubulifera ; 

 and, having now studied five species of Eupatliitlirips and the allied genus 

 Sedulothrips, I have considered it expedient to form a division for their 

 reception. The compressed and subcarinate dorsum of the head, the laroe 

 finely-facetted eyes, almost contiguous in front, the subventrally or ventralh- 

 seated antennas, and the long mouth-cone are typical of this group ; whilst 

 the form of antennse and the long sense-cones are also peculiar, the latter 

 originally suggesting the generic name Eupatlnthrips. In describing 

 P olyommatothrips vigilans I'rom Panama, Hood * has pointed out that 

 the strongly emarginate fore-margin of the ])rothorax enables the head 

 to be moved back to an angle of about 45 degrees. The antenna' are 

 inserted on the ventral surface and must be carried in life at almost 

 right angles to the head — hence the necessity of the abnormal moving back 

 of the head. Mr. J. D. Hood has very generously forwarded me his unique 

 $ and ? fypes of this interesting insect for examination and comparison 

 with my Trinidad example,, which is a very closely allied species. I have 

 thus had an opportunity of studying all the known species of this gi'oup, 

 and append a few further remarks upon Evpathitltrips deiitipes, v, hich 

 still rests upon the type-specimen collected by Mr. Ohampion. I should 



* ' Psyche; xx., August 1913, p. 123. 



