38 [February, 



teriorly ; pro- and raesothorax very large, metathorax narrow ; abdomen formed of 

 seven segments, anal scales triangular, with three hairs, of which tlie apical is the 

 longest ; anal cleft not deep, anal aperture with six long hairs ; on the periphery the 

 head has eight, prothorax three, mesothorax two, metathorax and following abdo- 

 minal segments each has one short hair, except the last and penultimate segment, 

 which have each two hairs ; for the rest, on the dorsal side, each segment on the 

 right and on the left from the median line is furnished with hairs. On the limit of 

 pro- and mesothorax, and meso- and metathorax is a group of three conical ducts. 

 Legs as in adult female. Antennae 6-jointed : 1st joint large, longer than the 2nd ; 

 2nd, 4th, and 5th in length equal ; 3rd longest, as long as the 6th ; three haii-s on 

 the 1st ; two on 2nd ; two on 3rd, very long ; one on 4th and 5th ; and about ten 

 on 6th. 



Larva, second stage. — Lai*ge, elliptical, brownish ; margin with many conical, 

 spine-shaped, glandular ducts. Legs as in mature female. Antennae of seven joints 

 only : the 1st large ; the 2nd, 4th, 5th, and 6th shorter, in length equal ; the 3rd 

 longest, the last a little shorter ; two hairs on Ist ; two very long on 2nd ; 3rd 

 hairless ; three on 4th ; one on 5th and 6th ; and about ten on 7th. Anal cleft, 

 aperture, and scales as in adult female. Length, 1-5 mm. ; breadth, 0-6 mm. 



Perfected male unknown. 



Male scale very long and broad. 



Hahitat : Mosolj, near Prague, Central Bohemia, on Befula alia. 



Last May I found female scales just adult, placed on the stem 

 and twigs ; in June they were full of eggs, from which in some days 

 after proceeded newly-hatched larvae. In November last I was so 

 happy as to find in the same locality, and on the same birch tree, 

 examples of the second larva-stage, and I observed that during the 

 development antennae and anal scales are altered, the legs remaining 

 always of the same form. 



Mr. J. W. Douglas, in his " Note," No. 20 (Ent. Mo. Mag., 1891, 

 p. 96), on Pulvinaria letulce, has enumerated all the species from 

 Betula alba mentioned by authors, and there is yet apparently no 

 Lecanium described as coming from that tree, and no other known 

 species agrees with my specimens. 



Deeming, consequently, that I have a new species before me, I 

 sent two examples to Mr. Douglas, and asked his opinion. He kindly 

 wrote to me : — " * * a Lecanium apparently, but it is quite new 

 to me ; I know no Lecanium on Betula, and I cannot find that this 

 species has been described." 



My private opinion, sustained by such authority, is consequently 

 true, and I have the honour to dedicate this species to Mr. Douglas, 

 who has very much aided in determining it. 



Prague : December Ylih, 1894. 



