124 ilEMOIES OF THE QUEEXSLAXV MVSEVM. 



ocellus directed forward, scarcely overhanging ; posterior ocelli directed laterally. 

 Antenii* short, eight-segmented, slender beyond segment 2, which is broad and 

 goblet -shaped : sense-cones simple ; style short. Maxillary palpi two-segmented. 

 Prothorax short, without strong bristles, lateral margin explanate, particularly in 

 anterior lialf. Wings of fore pair pubescent only at margins, with a prominent '" ring 

 vein." one longitudinal vein, and a cross-vein near base ; anterior margin bare, 

 without fringe or spines ; median vein without bristles. Legs short. Abdomen of 

 normal structure in male, without expanded, fan-shaped bristles on segment 10. 

 • Genotype : — Plerothrips quadratiis sp. nov. 



Close to Rhipiphoroihrips, which it closely resembles in the venation of 

 the, fore wings and the complete absence of bristles and hairs from the costal 

 margin, but certainly distinct b}^ the transverse vertex and the armature of the 

 tenth abdominal segment. 



PTEROTHRIPS QUADRATUS sp. nov. 



Male (macroptcroiii). — Length about 0-9 nnn. Bodj' thickly chitinized. Colour 

 almost testaceous, with head, mesoscutum. part of mctascutum, and sides of ptero- 

 thorax, blackish brown ; tip of abdomen pale brown ; antennae uniform pale yellow, 

 with apical half of segment 6 and all of 7 and 8. blackish browii ; legs yellow, femora 

 very slightly darker at sides ; fore wings with scale, basal portion and veins, brownish 

 yellow, remainder clear. 



Head very prominently and heavily reticulate, blunt in front, liroadest across 

 eyes, cheeks sinuately converging to neck, which is sharply delimited by an anteriorly 

 arcuate, raised line. Eyes about twice as long as their distance from j)osterior margin 

 of head, less than half as wide as their interval. OcelU nearly equidistant, ocellar 

 area elevated. Antennre about twice the length of head ; segments 4 and 5 with short, 

 abrupt jiedicels; 3 and 4 each with single, stout sense-cone arising from pit on lower 

 outer apical surface. 



Prothorax quadrangular, obscurely reticulate ; lateral margin thin and broad 

 anteriorl}'. Mesoscutum and triangular midillc portion of mesonotum dccph' reticu.- 

 late lik(! head. Legs roughened. 



Abdomen reticulate, especially at sides, segments 1-8 with a more or less 

 scallojied, transverse, sub-basal line ; tergitc 9 with two pairs of long bristles whose 

 bases form a semicircle. 



Measurements of hoiotyjjc : — Length 0!)24 nnn. ; head, length 0-108 mm., 

 width 0-]8(t nun. ; ])r()thf)rax, length ()12(i mm., width 0-l'.)S mm. ; ])ter()thorax, 

 width 0-234 nun. ; lure wing, length <)-()24 mm., width near ba.se 0-0(j(i mm., at middle 

 0-044 mm. ; abdomen, width 0-247 mm. 



Antcmial segments : 12 3 4 5 7 8 



Length (/x) (18) (42) 49 31 27 2() 11 15 



Width (/Li) (24) 3fi 10 1!) 2(» Is !) 5 



Total length of aiitemia. 0-2IO mm. 



Described from one male taken by sweeping at Pentland, N.Q., January 6, 

 1913, by Mr. A. A. Girault. 



The quadrangular head and prothorax have suggested the s]K-eitic namo. 



