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MR. J. G. II. iREW ON THE LARVAL 



the ten dorsal commissures, the first and last of Avhich are, as 

 usual, thicker than the others. The tenth commissure gives oft' 

 no branches; the firsfc gives off" at each end a moderately large 

 anteriorl3r-directed branch; the second loops strongly forwards 

 ovei- the first and gives oft' a few branches anterioi'ly ; the third 

 is also strongly looped forwards and gives oft' a few branches 

 anteriorly. Commissures 4 to 9 inclusive are similar and are 

 represented in text-fig. 10 B. They are roughly transveise and 

 five oft* branches both anteriorly and posteriorly, each commissure 

 supplying the dorsal tracheation of the posterior half of one 

 segment and the anterior half of another. The dorsal commissures 

 themselves occupy approximately the same positions with regard 

 to the body-seg)nents as they do in Ghlorops. 



Text-fiirnre 23. 



Ji. comhinaUi. Posterior spiracle. Tlio ilottoil linn reiiroseiit.s tlu; od-o 

 of tlio apex of tho stigniatic piipillu. 



Paparium. Length 3'2 mm. Maximum breadth -9 mm. 



Colour golden brown ; anterior and posterior ends much 

 wrinkled and blackish. The thoracic segments are nnioli llattened 

 dorsally, so that their dorsal surface shows a large sliallow con- 

 cavity, from the antero-lateral corners of which the prominent 

 anterioi- spiracles of the larva projects forwards. 



For the emergence of the imago the puparium splits in the 

 usual manner along the lateral regions of the thoracic segments, 

 which in this case correspond to tho lateral margins of the dorsal 

 concavity. The posterior ends of the lateral splits are joined by 

 a dorsal transverse split, and the whole of the dorsal region of the 

 thoracic segments splits oft' as a roughly quadrangular plate, 

 which may or may not become completely detached from tho 

 puparium. The anterior spiracles are attached to the dorsal 

 plate. 



