6cu 



THE ANIMAL PARASITES OF MAN 



ensheathed in the maxillary palpi. The antennas have the first two segments small, 

 the third large with a marked pore, the orifice of the sense organ near the base ; 

 from the base of the third segment also arises the three-jointed arista, the first two 



segments being, however, minute ; the 

 third bears a series of from seventeen 

 to twenty-one fine branched hairs on one 

 side. The male genitalia or hypopygium 

 is more or less oval and tumid, its long 

 axis lying in the antero-posterior direction, 

 with a vulviform median groove (the 

 anus) running from the anterior margin 

 to beyond the middle. 



[Newstead has shown the importance 

 of the study of the genitalia in separating 

 species (vide Bull. Ent. Res., ii, pp. 9-36 

 and 107-110, and iii, pp. 355-360; and 

 Ann. Trop. Med. and Par., vii, No. 2, 



FIG. 417. Head of Glossina longipalpis, 

 Wied. (After Griinberg. ) 



PP- 331-334)- 



[The tsetse-flies reproduce differently from all other Muscidce. The female pro- 

 duces at each birth a single full-grown larva, which is retained within the oviduct and 

 there nourished by the secretion of special glands, and on being born crawls to some 

 hiding place and at once becomes a puparium. 



FIG. 418. Antenna of Glossina pallidipes, male. (After Austen.) 



[The larva is a yellowish footless maggot nearly as large as the mother's body, 

 the skin shagreened and the anal extremity having a pair of large, black, granular 

 prominences separated by a depression containing the breathing pores. 



[The puparium is brown of various shades, the tumid lips of the larva being con- 

 spicuous,'the size and shape of the lips enabling the puparia to be identified. 



