214 MYIASIS 



tentacula ; each is surmounted by two or more groups of very small chitinous teeth. 

 Just above each tentaculum is another small group of teeth. On either side of the 

 black tentacula two irregular rows of small teeth are placed one above the other. 

 The two latter groups are not placed upon tubercles. The integument of the larva is 

 thick, and difficult to tear. The larva is able to withstand a good deal of pressure 

 without injury."' 



They frequently noticed the fly, which is sluggish in its 

 movements, in the huts, and were told that it often deposited its 

 eggs on the ground of a hut, " particularly in spots where urine 

 had been voided," 



Lelean (1904) forwarded his flies to Austen, who gives the 

 following description of them : 



AncJinieroviyia luteola. 



" c? 9 length lo^mm. to 12 mm. ; length of wing lOf mm. ; width of head ^h mm. 

 in (J , 4 mm. in ? . 



'•'■A rather stoutly-built Jly, orange-buff in general colour, hut with the distal half 

 of the abdomen blackish. 



'■'■Head, orange-bufif, with the eyes wide apart in both sexes; thorax, somewhat 

 darker than the base of the abdomen, with a faint greyish bloom, and marked with 

 two indistinct blackish longitudinal stripes, which do not extend to the hind margin 

 of the thorax ; abdomen, in the S with the hind margin of the first segment more 

 broadly, a more or less complete forwardly tapering median stripe, the whole of the 

 third segment except the extreme base, and two large lateral blotches on the fourth 

 Segment, meeting, or nearly so, in the median line, blackish. In the ? the blackish area 

 on the abdomen is greater, since it includes in addition the whole of the second 

 segment, except a more or less narrow band at the base. A striking sexual difference 

 is to be seen in the second abdominal segment, which in the ? is twice the length 

 of the same segment in the i ; legs, orange-buff; ivings, faintly brownish, but entirely 

 devoid of blotches or other markings, so that the veins are plainly visible.'' 



B. LarvcB deposited in tiatural cavities of the body. 

 Nose and ears. 



Though various species of the genus SarcopJiaga have been 

 known to deposit eggs or young larvae in natural cavities of 

 the body opening on to the surface, the fly which most commonl)- 

 does so is the screw-worm fl}% CJirysomyia macellaria. 



This fly occurs in many parts of America from Canada to 

 Patagonia, but is especially common in the warmer regions. It 

 measures 9 — 10 mm. in length, and bears a great resemblance to 

 the common green-bottle, Liicilia aesar, being of a dark metallic, 



