266 [May, 



basal joint. Westwood (Intr. Mod. Class. Ins., ii, 442), six joints, but his fig. 118, 

 3, shows seven joints. Amyot and Serville (Hemipt., 614), six joints. Signoret 

 (Ann. Soc. Ent. France, 4 Ser., t. viii, 377), seven joints, 1 very short, 2 larger, 

 globose, three following almost filiform, 3rd longest, contracted a little in the middle, 

 3, 5, 6 and 7 sub-equal, together scarcely longer than 3. Signoret gives seven joints 

 as a normal generic character. 



A. aceris, Geoffr., Bouche (Stett. ent. Zeit., xii, 109), <? , ten joints, 1 and 2 almost 

 spherical, 3 longish and thicker, 4 thin, as long as the first three together, 5 shorter, 

 6 thin, longer than 4, the remainder oblong, shorter, in length sub-equal : $ , nine 

 joints of like proportions. Signoret {op. cit., p. 394), seven joints, 1 short, globose, 

 2 twice as long, clavate, 3 two and a half times as long as 2, nearly as long as the 

 last four, undulated, very small at its base, afterwards thicker ; 4 and 7 of equal 

 length and shortest ; 5 and 6 of equal length, and a little longer than 4 and 7 ; 5 

 globose at the extremity ; the last five circularly striate. 



A. asarumis, Shimer (Trans. Amer. Ento. Soc, i, 281), six joints, 1st thick, 

 clavate. 



Koch (Pflanzenlause, p. 324) describes four species : chelidonii, Latr. ; Irassicce, 

 Koch ; carpini, Koch ; lonicera, Koch ; all as having six joints in the antennae ; but 

 on pi. 54, figs. 393, 394, 395 and 396 all four have seven joints. He says of A. 

 lonicerce, " Das rierte Glied der Fiihler in drei Gelenke abgetheilt." 



Signoret (op. cit., p. 381) remarks, respecting the intercalary joints of the 

 antennae, " As to the 4th joint of the antennse being divided into several, it is a fact 

 that this is seen more or less in all the joints of the antennse of the species of this 

 genus, and is more or less visible according to the aspect examined." This is doubt- 

 less the key to the discrepancies exhibited in the descriptions and figures of more 

 than the normal seven joints that I have referred to ; where only six joints are 

 recorded, I must believe that the basal joint has been regarded as an antenniferous 

 process. It must, however, be admitted that in consequence of the farinosity, the 

 intercalary joints, and the transverse striation (which is very evident under a high 

 power), the recognition of the normal number of articulations is very difiicult; yet 

 I believe I have given those of this species correctly. 



In September, 1886, I saw some larvae of an Aleurodes attached 

 to the under-side of the leaves of black and red currant bushes 

 {Rihes nigrum and ruhrum), and as they did not agree with any de- 

 scription, I concluded they were a new species ; but to be sure, I sent 

 some to Dr. Tranz Low, Vienna, and he confirmed my belief. I had 

 hoped that the imago would appear before or in October, but the 

 larvae remained on the leaves, and fell witb tbem late in October. I 

 then gathered a quantity and put them into an open plant pot, where 

 tbey remained exposed to the weather all the winter. I also put some 

 five or six into a gauze-covered glass and kept indoors, and I gummed 

 a dozen on to card. Of the latter one became an imago in about a 

 week ; one only of those in the glass was transformed in February. 

 At the end of April I sent a few of those kept out of doors to Dr. 



