THE PEAR MIDGE. 



47 



longest ; wings faintly fuliginous, with slight reflections, covered 

 sparsely with a very delicate blackish pubescence ; veins some- 

 what darker ; fringes blackish ; halteres pale yellowish ; legs 

 dusky, with a more or less yellowish tinge ; tibial palest, femora 

 almost black outside hi some of the fully-mature specimens, 

 covered inside with pale yellow, glistening pubescence, the 

 hairs along the inner surface whitish. Abdomen dark grey, 

 almost black dorsally, where it is sparsely beset with minute, 

 fine, pale hairs, and with a fringe of long, fine, pale-yellowish 

 hairs along the posterior border of each joint ; venter more 

 brownish, inclining to black, each joint with a transverse quad- 

 rate spot, obsolete in the darker specimens, more closely beset 

 with long and somewhat wavy, pale hairs ; genitalia pale- 

 yellowish or dusky, consisting of a pair of prominent, 2-jointed 

 claspers or forceps, which, when protruded, are recurved dorsally ; 

 the basal] joint swollen, ^ellipsiodal, with a few stiff hairs and 



1 2 



FIG. XXIV. THE PEAR MIDGE (Diplosis pyrivora}. 



i. Pear stunted and malformed by the larvae within it. 2. Section of pear 

 showing larvae within. 3. Larva, much magnified. 4. Female fly, much 

 magnified. Lines show natural length of fly and larva. 



very faintly striate transversely ; the terminal joint consisting 

 of a hood, evidently movable and usually bent inward and 

 backward ; just above these prominent claspers is the style or 

 intromittent organ proper, a jointed process, reaching, when 

 at rest, not quite to half the length of the swollen basal joint 

 of claspers and broadening basally ; a suprapenal piece is 

 crescent-shaped, the ears of the crescent reaching about as far 

 as the tip of the style and its base broadening. Still above 

 this is a V-shaped palpigerous piece, broad terminally, with 

 a well-marked V-shaped medial slit, and with a simple palpus 

 and a stiff hair on either side. The whole mechanism plays on 

 an elastic and membranous sheath, which is retractile within the 

 anal joint of the abdomen. Before use it is closely folded back 

 so as to be with difficulty analysed. 



