THTSANOPTERA FROM THE WEST INDIES. 501 



EUPATHITHRIPS AFFINIS, sp. n. (PI. 48. fig. 11 ; PI. 49. figs. 6 & 8.) 



(^ . Length about 4*5 mm. 



Colour as in E. silvestrii, but with the apical tivo-thirds of intermediate 

 tibife and apical half of hind tibise yellow. Abdominal segments 3 to G each 

 with a pair o£ antero-lateral white patches. 



Relative lengths o£ antennal joints 3-8 as follows: — 163: 168 : 174: 110 : 

 73 : 36. Sense-cones protected by long pointed sette as in E. dentipes. 



This species differs from E. silvestrii in its smaller size, the relative lengths 

 of antennal joints 3 and 4 (which in this species are practically subequal), 

 and in the coloration of the intermediate and hind tibiae. The genal spine 

 just behind eyes is more minute than in silvestrii, whilst the genal spiniferous 

 tubercles and those along the inner margin of each fore-femur are noticeably 

 larger than in the ^ of that species. The two series of tubercles along inner 

 margins of fore-tibife, so strong in dentipes, and in silvestrii vestigial, are in 

 affinis distinctly denoted. 



Though a smaller species, the prothoracic setre (at least the mid-lateral 

 and anterior pairs) are distinctly longer than in silvestrii, the shortest being 

 at least 0"4 the length of the prothorax. 



The bristles of the 9ih abdominal segment are longer than in silvestrii, the 

 outer being about as long as the tube and the inner distinctly longer, whilst 

 the lateral abdominal bristles are comparatively longer also. 



Type. In Hope Collections, University Museum, Oxford. 



Habitat. Trinidad, 1 $ , taken by Mr. Hugh Scott from between the 

 leaf-bases of an epiphytic Bromeliaceous plant, from the virgin forest of 

 Trinidad's highest mountain, Tucuche, 3100 feet, March 20th, 1912. 



EUPATHITHKIPS SILVESTRII (Bufa). (PL 48. fig. 12 ; PI. 49. figs. 7 & 9.) 



HeterothriiJS silvestrii, Buffa, ' Itedia,' iv. 1908, pp. 124-125, fig. 2. 

 Polyommatothrips silvestrii, Buffa, op. c. v. 1909, p. 164. 



? . Length 5*0 to 5'5 mm., breadth of mesothorax about 0*7 mm. 



Colour dark chestnut-brown ; fore-tibise yellowish shaded lightly with 

 brown near base, intermediate and hind tibise with the distal half and fifth 

 respectively yellow ; all tarsi yellow. Antennal joint 3 yellow, lightly 

 touched with brown near apex ; stems of 4 and 5 and basal third of 6 

 similarly yellow. 



Head 2*2 times as long as broad, and 2 5 times as long as prothorax through 

 middle ; cheeks with a few prominent spiniferous tubercles and a short stout 

 spine near eyes. Eyes practically touching anteriorly, very finely facetted, 

 occupying about one-third the length of head. Ocelli rather large, and 

 almost completely surrounded by the eyes ; anterior ocellus forwardly 

 directed. Postocular bristles short and blunt, placed far back^ about one- 



