224 Transactions. — Zoology. 



account of the tubercles it ought to be removed thence, I see no reason 

 for perpetuatmg the error here, and have therefore placed it in its proper 

 place. 



Planchonia ejjacridis, sp. nov. (?) 

 Figs. 30-37. 



Young insect about ^ inch in length, outline oval, body flat, tapering 

 somewhat towards the anal tubercles (fig. 30). Antenna (fig. 31) of five 

 joints, but as these are crossed by numerous, closely placed, transverse lines, 

 they seem to have more joints. The last joint is slightly clavate and has 

 several long hairs. Feet (fig. 32) with well developed coxa, trochanter and 

 femur ; tibia and tarsus thin. I can make out only two digitules, which 

 are fine hairs. From the anal tubercles spring two long seta. The mentum 

 is uni- articulate. General colour reddish brown. All over the dorsal sur- 

 face and round the edge of the body are scattered spinneret orifices in 

 the form of the figure 8, from which spring long, curling, white, glassy 

 tubes. 



Second stage of female with general outline resembling the young ; body 

 somewhat flatter, marked with several transverse corrugations. Average 

 length about Jq of an inch (fig. 33). Antennse completely atrophied, 

 indeed quite lost, their place being occupied only by circular rings with four 

 hairs (fig. 34). Feet likewise absent. Mentum uni-articulate. Anal tuber- 

 cles not very prominent, each bearing a long seta. The anal ring has, I 

 think, six hairs. On the dorsal surface there are only a very few spinneret 

 orifices, but round the edge of the body is a row of the figure-of-8 spin- 

 nerets, and from these springs a long silvery fringe, which is double. In 

 fig. 33 I have tried to represent this fringe, but have only been able to show 

 one row of it. It is necessary to imagine another row above the one shown, 

 as if there were two fringes, one over the other. As the colour of the 

 insect at this stage is reddish brown, as is also the surface of the leaf on 

 which it feeds, the effect of this double glassy fringe of silver is of great 

 beauty. The tubes of the fringe are not quite straight. Each pair springs 

 from one of the figure-of-8 orifices, and the tips slightly diverge. 



The adult female is covered over with a smooth, hard, semi-transparent 

 test, convex above, flat beneath, and on the underside this test is also almost 

 closed, leaving only an orifice for the rostral setae, so that the insect is really 

 enclosed : but at the extreme end of the abdomen the upper and lower 

 portions of the test are slightly parted, leaving an opening. The test (fig. 

 85) is oval, but tapers towards the anal extremity, and in all the specimens 

 which I have seen this anal end was turned towards the tip of the leaf. I 

 should imagine that the reason for this is to facilitate the work of the male 

 (though I have not as yet found any male insects). The leaves of Leuco- 



