NEW GENEEA AND SPECIES OF AVSTSALIAN TlirSANOVTEBA—UOOT). 125 



PHIBALOTHRIPS gen. nov. 

 ((^t'/SaAo?,^ slender ; dpiift, a wood-worm). 



Body deeply reticidate. Head longer than broad, abruptly and strongly 

 constricted at base ; vertex elevated between eyes and produced. Eyes strongly 

 protruding in front, not longer than cheeks. Ocelli approximate, the anterior ocellus 

 overhanging and directed forward, the posterior ocelli directed laterally. Antcimae 

 seven-segmented, very slender beyond segment 2, which is broad and goblet-shaped ; 

 5-7 compactly united in a fusiform mass, 7 needle-hke ; sense-cones simple. Maxillary 

 palpi two-segmented. Prothorax slightly transverse, without strong bristles ; lateral 

 margin exjilanate. Wings very slender ; fore wings with complete marginal vein, 

 only; costal margin with neither fringe nor bristles. Legs short and stout. Abdomen 

 unusually long and slender, apical segments more heavily chitinized ; segments 2 and 

 9 longest ; 9 distinctly longer than 10 and with three pairs of strong, dorso-lateral 

 bristles, of which the middle pair is slightly longer than segment 10, and twice the 

 length of the lateral pairs ; terminal segment conical, rounded at tip, divided in 

 its entire length. 



Genotype : — Phibalothrips exilis sp. nov. 



Phihalothrips is a member of the HeUothrips group, and is closely related to 

 Retithrips, Rhipiphorothrips, and Pterothrips. With all of them it agrees in lacking 

 the anterior fringe of the foi'e wings. The antennal structure is distinctive, as is also 

 the slender body and the absence of longitudinal wing- veins. 



PfflBALOTHRIPS EXILIS sp. nov. 



Female {macro pterou.s). — Length about l-l mm. Head, prothorax, meso- 

 thorax, scutellum. and antennal segments 6 and 7, dark brown ; remainder lemon 

 yellow, with sides of metathorax and of abdominal segments 9 and 10, tinged with 

 orange. 



Head longer than wide, sides almost perfectly straight to the rectangular 

 neck-like constriction ; deeply reticulate above, with two smoother chevron-shaped 

 areas extending from side to side ; frontal costa narrow, notched. Eyes anteriorly 

 acutely produced and protruding, considerably surpassing the vertex and the base 

 of the first antennal segment. 



Prothorax only 1-25 times as wide as long, almost smooth, with a narrow 

 band of reticulation near anterior margin and with a few minute bristles ; lateral flange 

 smooth. Mesothorax sculptured both above and below. Metathorax smooth, except 

 the very acute, reticulate scutellum. Legs yellow, reticulate. Wings almost colour- 

 less, washed with yellow along the veins. 



Abdomen slender and elongate, reticulate except along median line ; segments 

 3-8 with a serrate, siibbasal line ; posterior margins of tergites 1-8 serrate at sides 

 with short, blunt teeth ; tergites 2-7 with two median, posteriorly converging hues of 

 sculpture. 



2 This worfl, though not commonly given in lexicons, is to be found in that of C'onstantine (1592). 



