Mew South Wales. 



169 



Key to Females. 



Female sexual apparatus douhk : — Pasc. 



Tail and anus none ; saccate worms parasitic in roots — 



]!ocly widely fiisifoi-m 2 SchaeUUi 170 



Body ellipsoidal or spherical 3 arenarius 170 



Tail rounded at the terminus — 



Length '75 ?«m. i (esophagus 18 5 dubius 171 



Length 1 '70 TO?n. ; oesophagus 12o 4 robmlus 170 



Tail conical — 



Cuticula with two lateral and four submediau wings ... 7 lamelliferva 171 

 Cuticula with no such conspicuous wings 6 (jracilis 171 



Female sexual apparatus simple (single) : — 



CEsophagus Tylenchoid, i.e., with one or more bulbs ; 



parasitic in bees 1 hombi 1C9 



OEsophagus Tylenchoid ; if parasitic then in plants — 

 Tail conoid terminus not rounded — 



Neck only 4 '2 , 13 scandens 173 



Neck 10 — 



Vulva 92- 12 funt/orum 172 



VulvaSO' 23 AsLanaseiji 176 



Neck 14 to 19— 



Vulva central 16 leptosoma 174 



Vulva about 67 — 



Anus 70- 17 filiformis 174 



Anus 85" or more — 



Length '54 »(7ji; width 4' 10 terricola 172 



Length '85 mm. to \'mm. — 



Width 2-1 21 inkrmedius 175 



Width about 3-— 



Spear 1 '2, hardly knobbed 22 elegans 175 



Spear 19, distinctly 3-knobbed 20 Davainii 175 



Vulva 80 or more — 



(Esophagus 14' ; vulva S8' 11 imper/ectus 172 



(Esophagus 16'7 ; vulva 80' 14 devustatrix 173 



Neck 27 to 29— 



Anus 92' ; vulva 83' 18 macrojihallus 174 



Anus 85- ; vulva 70- 19 t>Ululifer 174 



Tail ro\inded at the terminus — 



Vulva 75' + ; tail conoid 8 ^)i-a(en.sis 171 



Vulva 67' ; tail nearly cylindrical 9 obtusus 172 



CEsophagus Dorylaimoid, «.c. lachrymatoriform 24 mirahiliit 176 



1. T. bombi, Dufour. The young of this remarkable species are worms 

 about one millimetre long, living fi'ce in the soil, where they become mature 

 and copulate. The fertilized females enter the bodies of hibernating bees, and 

 there lead a parasitic existence, occupying either the body cavity or the wall of 

 the alimentary canal. During the parasitic life the sexual apparatus pro- 

 trudes from the vulva, and ultimately becomes a sac one and a naif 

 millimetres long, to which is attached for some time the real body of the 

 worm in the form of a small appendage ; but even this finally disappears. 

 In this latter condition the animal first became known under the name of 

 Sphcerularia bombi. The young, to the number of 50,000 to 100,000, hatch 

 while still in the body of the host, but become sexually perfect only on 

 entering the soil. 



