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A REMARKABLE NEW GALL-THEIPS PROM AUSTRALIA, 



on the inner margin with 3 — 5 thick teeth, the number of which often varies 

 in the same specimen on the right and left legs; after the last tooth, just before 

 the knee-joint, a long bristle. Fore-tibiae short and very thick, not considerably 

 more than half as long as the femur, constricted at base, and distinctly broadened 

 towards the apex; on the inner margin a row of small tubercles and, before the 

 acute apex, a long bristle; on .the outer margin a somewhat shorter subapical 

 bristle. Fore-tai-sus with a very large, acute, tooth-like process, and a second 

 smaller one, between them the apical bubble of the tarsus (Text-%. 3). 



Pterothorax very stout, distinctly wider than long, with sinuated, somewhat 

 backwardly converging sides. Behind the transverse suture, separating meso- 

 and metanotum, a pair of backwardly directed bristles. Sutures of meso- and 

 metasternum — besides the transverse limit between these two segments — apparent- 

 ly abortive, even in ' lightly coloured specimens not definitely distinguishable. 

 Middle coxae cylindrical, the hind ones somewhat tumid; the former more widely 

 separated from one another than the latter. Middle and hind leg-s stout, set 

 along both margins with some short hairs and a few longer bristles. Tarsi 

 without teeth. 



Abdomen a little narrower than pterothorax, about four times as long as 

 wide. First segment with three smooth, strongly chitinized, triangular plates, 

 the median narrower, with the acute angle forwardly directed, the lateral ones 

 broader and more blunt, their apex directed backwards. The space between them 

 with a distinct, dotted sculpture. The following segments with 3 (except only 

 2 on the second) long bristles at each hind angle, and with some shorter hairs 

 along the hind margin and one on the lateral margins. Wing retaining spines 

 weak and slender, the space between the tips of the hind pair about four times 

 as long as the spines themselves; fore pair not distinguishable on account of the 

 dark colour of body. Bristles of the ninth segment nearly as long as the tube. 

 This latter short, only slightly more than half as long as head, with straight, dis- 

 tinctly converging sides; at base about half as wide as long, and somewhat more 

 than twice as wide as at apex. The longer terminal bristles a little shorter than 

 the tube itself, the shorter ones not yet half as long as the others. 



I have allowed myself the pleasure of naming this remarkable new species 

 after its discoverer, Mr. Walter W. Froggatt, who has kindly sent it to me for 

 description. 



There are no morphological differences between the two sexes, well distinct 

 forms occurring equally in both sexes. 



Forma aptera (Text-fig. 4). It is not unusual amongst Thysanoptera, that 

 a macropterous and an apterous form of a species may be found although, of 

 gall-thrips especially, very few apterous forms are known. But it seems very 

 remarkable and exceptional that the apterous form here described differs from 

 the macropterous foim, not only by the absence of wings, by smaller eyes and 

 ocelli, a shorter pterothorax and abortive wing retaining spines, but also by 

 other characters. Therefore, I find it necessary to describe it somewhat ex- 

 tensively. 



Head somewhat shorter, about one and one-third times as long as wide. 

 Eyes and ocelli smaller than in the macropterous form, the former occupying 

 only one-fifth of tlie length of head. Antennae very stout, their middle joints 

 not or hardly longer than broad. All bristles of the whole body exceedingly 

 long, acutely pointed at apex, not knobbed. The inner ones of first antennal 

 joint reaching about to the end of third joint. Both pairs on the dorsal surface 

 of head distinctly overreaching the end of first antennal joint. Bristles of abdo- 



