104 Larval and Pupal Stages of Scatoj^se Notata, L. 



surface convex. It is a dirty white in colour, but this colour is obscured 

 during life by particles of soil, etc. which adhere to it and give it a much 

 darker appearance. During life the form of the larvae, in particulai' f)f 

 the posterior end. was very much obscured by adherent particles. 



The larva bears nine pairs of spiracles, which are situated a pair on 

 each segment, on the first and the fourth to eleventh segments inclusive. 

 The spiracles are brown in colour and are situated laterally. They are 

 placed rather nearer the anterior than the posterior border of the 

 segments except for the paii- on the eleventh segment. These latter 

 spiracles are considerably larger, and are situated in a more dorsal 

 position on the posterior margin of the segment. All the spiracles project 

 considerably from the body, the amount of the projection being more 

 than twice the diameter of the spiracle. The last pair, hoAvever, projects 

 to a much greater extent than the preA'ious pairs, each spiracle being 

 about as long as the twelfth segment. 



The spiracles on the eleventh segment bear near their apices a number 

 of fine setae projecting downwards towards the body. The other 

 spiracles are rather spatulate in shape, those on the first segment being 

 slightly larger than the others. 



The structure of the posterior spiracles is very similar to that of the 

 spiracles of Bibio larvae, in that the opening is within a funnel which is 

 supported internally by a system of trabeculae (Text-fig. 7). 



The segments of the body bear a large number of setae, which vary 

 in length on the different regions. The first ten segments each bears 

 on the dorsal surface a transverse row of numerous setae, placed near 

 the posterior border. In front of these bands of setae are five short 

 broad longitudinal rows, of which the central one is median in position 

 with two rows on either side of it. On segments four to ten the outermost 

 of the longitudinal rows of setae arc inclined inwards anteriorly, and 

 become confluent or nearly confluent with the adjacent row of setae. 



The eleventh segment bears dorsally a single median transverse row 

 of setae, this row being continued backwards, at the sides, to the posterioi' 

 margin of the segment. 



The twelfth segment, which is much .smaller than any of the pre- 

 ceding segments, bears a pair of large reddish-brown processes at its 

 posterior end. These processes ai'e about equal in length to the segment 

 and bear a number of long setae, which arc spread out in a fan-like manner. 

 (Plate X, fig. 4.) 



The anterior part of the ventral surface of the first segment projects 

 sli^htlv, and is covered with small setae. Ventrallv, the fourth to tenth 



