34« 



SOME SOUTH IMM \\ I\SK( l S. K l< . 



I 



Fig. 2(i7. Gistrus ovis. Female fly (magnified), Larva (natural size), and 

 IK (natural sizi i mtline figure). (< h iginal. I 



side ol the head and feed on the mucus. At this stage the larva 

 is creamy-white with two brown spots (spiracles) on the last 

 segment. When full-fed it makes it- waj down the nasal passages 

 of its host and drops to the ground where it quickly buries itself 

 and changes inside a smooth, hard, blackish, oval puparium. 

 Pupal period about a fortnight. 



Status. A serious pest of sheep. Goats seem little affected. 



( initial. Preventive measures seem little practised in India where 

 infestation by this ll\ is apparently accepted as normal. Frequent 

 dressing of the sheeps' noses with tar, or a mixture of Tar and 

 (rude Oil Emulsion, may be tried to keep the llies from ovipositing. 

 A leather dipped in turpentine, run up the nostril and quickly 

 turned, is sometimes used to dislodge the grubs but in most eases 

 it is impossible to reach them all. Valuable animals may be 

 trephined but this requires skilled veterinary assistance. All grubs 

 and puparia found in sheep-pens should of course be destroyed. 



Ml'SClD.-E. 

 PYCNOSOM A II WUKPS. Macq. 

 Lucilia flaviceps, Macq., Dipt. Exot, II, 3, 145. t. 18. f. 1 (1842). 

 Pycnosoma flaviceps, 1 [owlett, Ind. Ins. Life, p. 643, t. 69. f. 2 ( [QOQ). 

 Lucilia dux, Esch. ; van der Wulp, Cat. Dipt. S. Asia. p. 148 

 (1896). 



