ra 



-tf 



Miller and Watt. — Study of New Zealand Entomology. 277 



a pair of well-separated club-shaped two-jointed respiratory appendages 



(fig. 5, ra). One of these is shown greatly enlarged (fig. 6). Each one. 



excepting the first short joint, consists of a 



roughly ridged sheath (fig. 6, sh), the ridges 



extending over the whole surface, exclusive 



of the proximal ventral area, which is smooth. 



Along the ventral surface, and occupying the 



whole of the apex, are rows of numerous pits. 



the margins of which are raised above the 



level of the sheath. Within the sheath is a 



tracheal- like structure (fig. 6, tr). 



Ventrally the folds of the 1st segment 

 terminate in sharp convergent points at the 

 centre of the posterior margin of the 3rd seg- 

 ment (fig. 5. tf). The inner margins of these 

 folds — the wings — are ridged and separated 

 by a set of 3 lobe-like structures — the limbs, 

 i.e., the 1st, 2nd, and 3rd pairs of legs — 

 notched on the posterior margins, and pos- 

 sessing a rnedio-longitudinal fissure (fig. 5. Is). 

 More anterior still, about the middle line of the 

 first pair of ridges (the antennae) (fig. 5/7), Fia . 5 ._ Pupa of Psychoda con . 

 are a pair of ovate discs (fig. 5, sp), beset 

 with numerous pits and short delicate hairs. 

 The body segments from the 3rd to the pen- 

 ultimate are thrown into hollows and ridges, 

 the posterior margins carrying an armature of 

 stout reclinate spines (fig. 5), three of which 

 (a central and two laterals) are considerably enlarged, and are borne upon 

 protuberances. There are also 4 large and similarly formed discal spines. 

 Dorsally the spines are less stout, less numerous, proclinate, the discal set 

 being absent. 



The apical segment has no discal or 

 dorsal spines, but a half-whorl of stout 

 claws.* Arising from this segment is the 

 terminal appendage, consisting of 4 dorsally 

 curved massive claws (figs. 7 and 8). The 



spicillata. 1, 2, 3, 1st, 

 2nd, and 3rd pair of legs ; 

 tf, ventral extremity of 

 wing - case ; //', antenna ; 

 ra, respiratory appendage ; 

 sp, ovate discs. 



Fig. 6. — Respiratory appendage (greatly enlarged), tr, trachea ; sh, sheath. 



Figs. 7, 8. — Terminal claws. 



ventral pair are the smaller, and do not extend as far as the dorsal. 

 Both the anterior and posterior appendages are dark brown. 



The duration of the pupal stage is four days. 



The emergence of the adult fly is a most beautiful sight to watch 

 through the low powers of a microscope. The pupa-case splits anterio- 



* In fig. 8 these claws have been drawn on the dorsaj instead of the ventral side. 



