ON A LECANlUM FROM ROCHESTER, N.Y. 833 



also recorded from New Jersey in Prof. J. B. Smith's catalogue 

 of the insects of that State. L. juglandifex is treated of in 

 Packard's great work on Forest Insects, p. 338. 



So much for the published information ; now we may turn to 

 the specimens. 



A few weeks ago Dr. Lintner sent me specimens of a Lccanuim 

 thickly infesting a twig of plum. These were from Piochester, 

 N.Y., and the insect was there causing some alarm. The species 

 was new to me, but I came to the conclusion that it could be 

 none other than L. jnglandis, Bouche {juglandifex, Fitch). As 

 remarked by Bouche, it much resembles L. persica, but it may 

 be very easily distinguished at sight, if living, by the markings 

 of the immature female scale, which are as indicated by Bouche 

 in his description. The transverse yellow and blackish bands 

 alternate, so that there is no contradiction between the statements 

 of Bouche and Fitch — the one simply taking the dark, the other 

 the light, as the ground-colour. The individuals vary con- 

 siderably, and only one here and there is marked as plainly 

 as Bouche describes. 



The mature female, as Bouche says, becomes swollen, and 

 loses the colour bands. 



The male I did not see, but it will be observed that the two 

 accounts given of it agree sufficiently well. 



I wrote to Dr. Lintner explaining how the matter stood, and 

 suggesting that greater certainty might be aimed at, if the type 

 of Fitch's description could be found and examined. He very 

 kindly replied at once by sending me Fitch's type, which was in 

 his care, for study. 



On first glancing at this scale, I thought it must surely be 

 different from the Piochester species after all. It is 5 mm. long, 

 rather more than 4 broad, and 22- high. There is a short 

 posterior notch with contiguous sides, as usual in the genus ; 

 but the anterior margin presents a deep wide notch, very much 

 wider and deeper than is seen in any of the Rochester scales. 

 The scale is of a red-brown colour, not at all blackish, with three 

 strong dorsal keels, converging posteriorly ; and joined at their 

 anterior ends, and again about their middle, by strong trausverse 

 ridges. The transverse keels do not extend down the sides, 

 which, however, are strongly rugose-plicate, with pits. The 

 surface of the scale is shiny. 



It will be at once seen that this type differs as much from 

 Fitch's description as from the Eochester scales ; but the 

 anomaly was explained when, on looking again at the latter 

 specimens, I saw them in their dead and shrivelled condition. 

 The mature females do not alter in shape after death, but all 

 those not mature lose their coloured markings, and become 

 greatly changed in appearance. The shrivelling takes place 

 somewhat differently in different specimens, but I was able to 



