318 [December, 



NOTES ON SOME BRITISH AND EXOTIC COCOIDM (No. 18). 

 BY J. W. DOUGLAS, F.E.S. 



LeCANIUM ROBINIARITM, 11. sp. 



? adult. Scale short, round-oval, or in some examples 

 almost circular, very convex, chestnut-brown, very shining, 

 smooth, mostly with a few very slight punctures here and there, 

 without any dorsal keel or tesselation. Antennae (fig.) stout ; 

 of 7 joints, 1st stoutest, with one hair ; 2nd scarcely so thick, 

 in length subequal, with two hairs ; the others tliinner ; 3rd 

 longer than 2nd, without liairs ; 4th much longer, the longest 

 of all, with two hairs ; 5th and 6th short, together scarcely 

 longer than the 3rd ; 7th as long as the 2nd, pointed, with 

 several hairs, of which one (apical) is very long. Legs normal. 

 Length, 45 — 5 ; breadth, 4 ; height, 3 mm. 



The scales were filled, with white powdery matter, 

 consisting of the exuviae of the escaped larvae, show- 

 ing that they were quite mature. Sometimes, as the scales were 

 greatly agglomerated on the shoots of the Hohinia, the form is some- 

 what altered by the pressure, during the early stage of formation, of 

 one scale impinging on another ; in such cases the hollowed space is 

 a little wrinkled on the margins thereof. 



This species appears to approach L. tv/sfarice, Sign. (Ess. Cochen., 

 p. 263) in its rounded form, and in having seven joints to the antennae ; 

 but that species in the adult state is blackish, and almost rugose with 

 punctures, while this is very smooth, as if polished ; and the propor- 

 tions of the joints of the antennae are quite different. There is no 

 other species with seven joints in the antennae with which it can be 

 compared. 



On April 5th, 1890, I received from Dr. Horvath, of Budapest, 

 some shoots of Hobinia pseudacacia on which were clustered many 

 scales of this species, which Dr. Horvath states is very injurious to 

 the Bohinia in Hungary. It appears to have immunity from the 

 attack of Hymenopterous parasites, not one of the numerous scales I 

 received having been perforated by them. There were no scales of 

 the male. 



The figure is by Mr. G. S. Saunders. 



Lecantum fusctjm. 



{cf. Ent. Mo. Mag., xxiv, p. 98). 



? scale. Immature form before oviposition. Liglit reddish ; broadly rounded 



oval, rather widest in front, with a wide base of attachment to the shoot, flat-convex, 



shining, smooth but with very small punctures all over ; on the first third a white 



undulated line of irregular widtli extends entirely across the scale ; close to this 



