212 APTEEOCOCCUS FRAXINI. 



articulated to a short, rounded organ, to which is 

 attached the penis-sheath. When exserted the latter 

 projects slightly beyond the apex of the dorsal claw- 

 shaped organ, and has a strongly bifid apex. When at 

 rest the penis-sheath lies within the upper claw-shaped 

 organ, and appears on the ventral surface as shown at 

 fig. 9 a. 



Pupa (PL LXXII, fig. 14) usually of the same colour 

 as the male. More or less ovate and narrowed pos- 

 teriorly, but varying according to the age of the 

 individual. It bears a striking resemblance to the 

 pupae of certain Rhyncophorous beetles. 



Larva (PL LXXII, fig. 10) elongate- ovate. Pale 

 crimson-yellow, mottled with bright crimson; the 

 latter colour being also the colour of the eyes. Dermis 

 above with six longitudinal rows of truncate spines ; 

 two subdorsal and one marginal, on either side of the 

 meson. Antennas (PL LXXII, fig. 11) of six joints, of 

 which the sixth is much the longest, and bears four or 

 five long hairs and two or three shorter ones ; there 

 are also minute hairs on the third and fifth joints. 

 Legs (PL LXXII, fig. 12) scarcely longer than the 

 antennae, with the tibio-tarsal articulation central. 

 Anal extremity (PL LXXII, fig. 13) closely resembling 

 that of the adult female ; but the hairs to the anal 

 orifice are lanceolate ; and there are also two spines 

 immediately anterior to them, which are so arranged 

 that they appear almost continuous with the lanceolate 

 hairs of the orifice. 



Ova pink when first laid, but become mottled with 

 reddish-crimson. 



Habitat. Appears to be exclusively confined to the 

 ash (Fraxinus excelsior), the insects fixing themselves 

 in the cracks and crevices of the bark of the tree, 

 giving preference to the trunks of young trees and the 

 smaller branches of old ones. Extremely common in 

 many parts of Cheshire, where I first discovered the 

 insect in August, 1890. I have found it very sparingly 

 and extremely local in the Cotswold district between 



