OF TABANUS DIT^NIATUS AND TABANUS KINGI. 



267 



and dorsal, and betAveen the dorsal psetidopods, — three patches on each ring — 

 the median patch being conspicuous. To the naked eye these median patches 

 constitute a median dorsal line of black dots. On each o£ the third to the 

 sixth segments, inclusive, are two patches o£ dark pubescence immediately 

 anterior to the dorsal pseudopods. The posterior margin o£ the eighth 

 segment bears dark pubescence. The surface o£ the larva other than that 

 bearing pubescence is shiny and longitudinally striated. 



Mature lan^a (fig. 2). — Length 25 mm. Colour yellowish white. Mandibles 

 dark brown to black, slightly serrated. Thoracic segments shiny and lon- 

 gitudinally striated, except the anterior margins, which are opaque and 

 pubescent. On the prothoracic segment are five longitudinal grooves — one 

 ventral, two sublateral, two subdorsal — not extending to the posterior border. 

 On the meso- and metathoracic segments are eight such grooves, four on 

 either side. The first abdominal segment bears one pair of ventr.4l pseudo- 

 pods ; the second segment one pair o£ ventral and one pair of lateral (fig. 2, h) ; 



TmFL-ZJL- 



Fig. 2. — Mature larva of Tahanus ditceniatus, Macq. 



«, lateral view of larva, X3 ; 6, lateral view of 1st and 2nd abdominal segments, X' 

 c, lateral view of anal segment, X 6 ; 6?, posterior view of same (inverted), X 6. 



the third to the seventh, two pairs o£ ventral and one pair o£ lateral. Traces 

 o£ most of the other pseudopods are present, especially of the dorsal pseudo- 

 j)ods on the fourth to the seventh segments. The pseudopods bear small 

 colourless spines or hooks, and similar, though smaller, spines are situated 

 between the pseudopods and on the dorsum of the first, second and third 

 segments where the pseudopods are wanting. On the dorsum of the first 

 jind second segments these spines constitute a double band. The posterior 

 third of each abdominal segment is shiny and longitudinally striated. The 

 anus is edged with pubescence. The siphon when exserted appears rather 

 shorter than the eighth segment (fig. 2, c, d). 



y2 



