260 BOARD OF AGRICULTURE. 



filicum of Boisduval. (PL 1, fig. 7a, scale enlarged, seen from 

 above ; 7&, the same, seen from beneath, and showing the form 

 of the body surrounded by the broad, flat edge of the scale ; 

 7c, an antenna, enlarged ; Id, a leg, enlarged ; 7c, end of the 

 body, showing the flattened hairs fringing the edge.) It is reg- 

 ularly oval elliptical, both ends of the body being alike, though 

 the anterior end is a little narrower than the opposite, and is 

 much flattened. Along the middle of the body runs a promi- 

 nent ridge, considerably thickened in the middle, with a similar 

 transverse ridge just behind the anterior third of the body, and 

 another one on the posterior third of the body. On the edge of 

 many specimens are fine ridges, eight on each side, which radiate 

 outwards to the edge, which is fringed with minute hairs and is 

 very thin and broad. It is of a roseate tint, pale around the 

 edge of the body, and with a darker patch in the angles between 

 the median and transverse ridges. On the under side it is flesh- 

 colored, with traces of the minute dorsal ridges appearing be- 

 neath. The antennae and legs are very slender, the former 

 reaching one-fourth and the legs one-third of their length be- 

 yond the edge. The anterior legs are inserted twice as far from 

 the second pair as the second pair from the third. Length of a 

 mature female, .09 ; width, .06 of an inch. It moves very 

 slowly over the surface of the leaf. Boisduval's description is 

 so short as to be scarcely available in determining this species, 

 but as far as it goes it agrees with our insect. 



The Plalycerium Bark Louse.— AnothGr of this genus was 

 found on the leaves of the Platycerimn alcicorne in the plant- 

 house. It may be called Lecanium platycerii. In form it is 

 regularly oval, flattened and slightly convex above, with a slight 

 ridge along the middle of the body. In dry specimens, espec- 

 ially the smaller ones, there are minute ridges radiating from the 

 middle to the outer edge. The body of an adult female, (PI. 1, 

 fig. 56,) after it has ceased moving about, and has apparently laid 

 its eggs, as several young were found hiding luider the body, is 

 entirely flat beneath, being neither concave nor convex, finely 

 granulated, and pale brown above. The antennse are obsolete, 

 and the region of the mouth dark and discolored, the mouth- 

 parts having probably been torn away and remaining in the sub- 

 stance of the leaf. The body, in the younger stages of this 

 genus, quite distinct from the expanded edge, was in this spec- 



