1017.] _ 205 



tlie space between each being about equal to tbe length of one of tiie spines. 

 The stigmatic areas are indicated by one or two stouter, shorter, and more 

 obtuse spines. 



'Male pupariuin elongate ovate, rather strongly convex ; colourless, trans- 

 lucent, glassy. The surface is strongl}' rugose, but is entirely without the 

 subdivisions which are so conspicuous in the male puparia of many species 

 of Lecanhtin. There is a well-detined rounded median carina upon which is 

 superimposed a series of seven opaque rectangular glassy excrescences, and 

 there are two similar series (making live in all) on each side of the median 

 carina. The margin is closely set with longish cilia and a stout opaque white 

 tuft projects from each stigmatic area. 



Length 2, breadth 1 mm. 



Adult male with head and thorax (which is unusually ample) of a very 

 dark brownish castaueous colour ; the abdomen rather more reddish ; legs and 

 antennae paler. The wings ai'e ample, translucent whitish ; the costal uervure 

 orange-red ; the costal area tinged with reddish yellow. There are eight large 

 prominent black ocelli, four of which are on the under surfece, two on the 

 upper surface, the remaining pair having a lateral position. The minute rudi- 

 mentary ej'es are situated laterally, on the genae. Antennae lO-jointed, with 

 three knobbed hairs on the apical joint. Halteres with three long stout 

 hooked setae at the distal extremity (tig. 2, g). Caudal extremity with a 

 pair of long opaque white filaments. Sheath of penis slender, acute, approxi- 

 mately three-quarters the length of the abdomen. 



Length, from frons to extremity of genital sheath, luo mm. Wing 

 expan-e 4 mm. 



Hah. : On the brandies and 3'oung stems of Birch {BctiiJa alba) ; 

 more commonly on sapling plants; also on sapling Aspens [Po^ntlifS 

 tremula). Camberle}' : May, June. The adult male that was under 

 observation emerged on June 2nd. Young larvae were escaping from 

 beneath the scales on June 22nd. 



The female insects are extensively parasitized by two different 

 species of Chalcids. The old dead scales are frequently found to be 

 jierf orated with seven or eight exit-holes ; but this extensive parasiti- 

 /ation does not prevent the production of larvae. 



The species is very closely related to L. ciliatuni of Douglas, which 

 occurs on oak. In fact, the microscopical characters are almost identical ; 

 l)ut no one could see the two species, side by side, and fail to separate 

 them. They are completely dissiurilar in external appearance. L. zebrimim 

 is a more strongly convex insect; it has no conspicuous marginal cilia: 

 living examples are distinctly banded with black, and the secretionary 

 covering is disposed in a different manner. The only constant difference 

 in the microscopical charactei's that I have been able to detect is in the 

 antenna, the terminal joint of which is always considerably longer than 



