BY T. HARVEY JOHNSTON AND M. J. BANCROFT 129 



fly emerged on 8th January, 1920, and a female on 14th 

 January. Others collected in December were preserved for 

 description, whilst six collected on January 4th, 1920, 

 were allowed to pupate in a jar containing wet mud. From 

 these pupae one fly emerged on February 17th, two on 18th, 

 and three on 21st February. The maximum pupation 

 period during summer ranged from four to six weeks. 



Larva ffig. 4). This is a characteristically-coloured 

 organism, possessing well-defined black markings on the 

 •dorsal surface of each segment except the first and last. 

 The bands are faint anteriorly, but become more distinct 

 posteriorly, being very prominent on segments five to ten. 

 T^^ach band consists of a transversely-situated portion, 

 with a thicker median and two smaller lateral backwardly- 

 projecting prolongations. Fleshy tu))ercles are prominent 

 on segments six to ten. 



The larva when nearl}' mature measures from 27 to 

 33 mm. long by 3 mm. broad. 



Piiparium (figs. 5, (5). The length is 20 mm. and the 

 breadth 3 to 4 mm. The general colour, which is greyish, 

 and form closely resemble those of the preceding species,. 

 Each segment is provided with a row of stiff backwardly- 

 projecting hairs. The form and arrangement of the spines 

 on the eighth abdominal segment are, however, quite 

 different, as will l)e noted by comparing figs. 3 and 0. 



Dr. Ferguson identified the emerging flies as T. 

 batchelori Taylor, remarking that the species Avas closely 

 related to, if not identical with, T. laticallostis . 



Silvius notaUis Ricardo. 

 (Text-figures 7 and 8). 



Three large larvse, 23 mm. long and 4 mm. l;road, 

 of a greyish colour, and possessing fine longitudinal striations 

 on the cuticle were found in the muddy sand at the edge 

 of the water of the Burnett River on 5th October. They 

 were allowed to pupate. ■ One pupa died, while one fly 

 (a male) emerged on November 18th, and a female on 

 November 20th. The pupation period was thus not more 

 than six weeks. 



Puparium, (figs. 7, 8). The thoracic region is 3'ellowish- 

 brown, the abdominal segment brown. Each segment is 



