CHALCID PARASITES OF AUSTRALIAN SHEEP MAGGOT-FLIES. 113 



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Figs. 27-33, Xasonla brevicornis. 27, freshly deposited epg ; 2S. 

 1 S-hour embryo — note head, intestine, and anns ; 29, blowfly pupa with 

 a cluster of Nasonia eggs ; 30, head-end of larva in first instar, ventral 

 view showing jaws ; 31. larva, three days after its deposition as an egg, 

 second instar, showing respiratory system ; 32, head of larva figured in 

 fig. 31, showing jaws ij), antennae (a), buccal cavity (b.c), salivary duct 

 (s.d.), sphincter muscle {s.m.), and retractor muscle (r.m.) ; 33, jaw of 

 larva in third instar, — Fig. 34, egg of Dirhinus sarcophagce from 

 uterus of parent. 



