10 



[January 



are borne laterally, and some rather vague ones ventrolaterally. The 

 length, as far as can be judged from piecing together the ruptured 

 puparium, is about 4 mm. ; greatest breadth just over 2 mm. The 

 inner surface is smooth and shining. 



It was ruptured at the anterior end, in the manner which Perkins 

 describes (op. cit. p. 129) for all members of the Family in which he 

 has investigated the puparia ; the dorsal segment (fig. 1 d) bearing 



the respiratory processes becoming 

 ,c detached from the rest of the pu- 



parium, and the ventral segment 

 corresponding therewith (fig. 1 b) 

 also being loosened along its hind 

 border. In the specimen in ques- 

 tion this ventral portion has siuce 

 separated into two curved plates ; 

 a small anterior piece (fig. 1 a), 

 which in the bursting due to emer- 

 gence of the fly remained attached 

 to the above-mentioned ventral seg- 

 ment, and this ventral segment 

 (fig. 1 b) itself. This segment, the 

 one corresponding to the dorsal 

 plate bearing the respiratory pro- 

 cesses, bears at its front margin, 

 somewhat near the ventral middle 

 line, two minute rounded prominences of lighter colour than the 

 general surface (fig. 1 c, where they appear on the inner surface of 

 the segment as circular light coloured areas). Presumably these 

 mark the position of the anterior spiracles : 

 Perkins (I. c.) states that in some cases he dis- 

 tinguished the anterior spiracles, but in others 

 .-t failed to do so in spite of the closest examina- 

 tion. The respiratory processes (fig. 1 e, and 

 see Perkins, /. c.) are fine and very small. The 

 posterior stigmatic apparatus (fig. 2) consists 

 „ t, , . .. of a black area with fairly smooth surface, with 



Fig. 2. — Posterior stigmatic J 



area of puparium;*, one of the a deep impression near its lower (ventral) edjre, 



lateral tubercles ; a, depres- 1 i «■ ' t> ' 



iSi^SS^LSSSSSL ™ d a sin s le blullt P ale tubercle (% s - 1 ™ d 



viewed in certain positions. ^ q Qn eith(?r gide rpj^ st j grnat j c area j 8 



of the same type as that of the Australian P. hylams, floured by 



'-- t 



Fio. 1.— Outline of the ruptured puparium, 

 showing the detached pieces. Explanation in 

 text. 



'- T^'ilsMfek???.^ 



^d 



