J. T. Wadhwohth lof] 



The length of tiru*; that elapHe« between ovipOHition and hatc;hing, 

 varies Korriewhat ; probably temperature \n the controlling iac.tor. 

 In July 1912, larvae were obtained in eight days from the date of 

 oviposition, whilst in June 1013, the shortest time recordwJ between 

 these two events was eleven days. 



The larvae, after hatehijig, may be found creeping on and betw<ien 

 the florets ; possibly they feed on these for a short time, but very soon 

 they bore their way through the walls of the corollae and travel down 

 the corolla tubes to the developing ovules. The corollae that contain 

 larvae may be readily distinguished from those that are uninfected. 

 Small circular or elliptical apertures with di«coloure<J margins are visible 

 on florets that contain larvae, and in the majority of cases these apertures 

 are about one-third the length of the floret from the t/jp. Usually 

 each infected floret contains only one larva, but occasionally two 

 larvae may be found, and in one example I found four larvae within 

 a single floret. I have never observefl more than a single fully-grown 

 larva in the conjpletfid larval chamber ; it is therefore probable that 

 where more than one young larva enter a floret all except one eat 

 their way out again and enter other florets. On reaching the base of 

 the corolla tube the young larva bores into the developing ovule and 

 by its activities in this position induces the formation of the gall. 



The recently hatched larva measures about 0-5 / 0-1 mm. and has 

 a glistening white appearance ; it is cylindrical in shape and slightly 

 thicker at the anterior than at the posterior end. There are two pairs 

 of very small papillae on the anterior segment placed just above the 

 mouth hooks ; the lower pair, nearest the mouth, are the sense-organs 

 or palpi, and the upper pair are the antennae (Mik). The pharyngeal 

 skeleton is well developed and very similar in shape to that of the fully 

 grown larva, with the obvious difference that it is very slender and 

 slightly chitinised. At the posterior end of the body the spiracles 

 are visible under a high magnification, as two light-brown spots, and 

 each spiracle possesses three apertures. 



The larvae do not grow very rapidly at first ; two larvae fourteen 

 days after hatching measured only 0-G / 0-12 mm., and a larva five 

 weeks old measured 1-3 / 0-4 mm. During the following two or three 

 weeks growth is very rapid ; two larvae that w^ere about eight weeks 

 old (Aug. 13th) measured 3-5 / 1-5 mm., and 3 / 1*8 mm. respectively. 

 The posterior surface of the last segment in both these larvae was 

 becoming dark in colour and strongly chitinised ; in larvae preserved 

 early in September these characters are fully developed, and in addition 



