NEMATODA 357 



(Esophagostomum dentatum, Rud. 

 Colonel Reid reports this species as occurring among pigs in 

 New Zealand. 



Family Trichotrachelidje 



Tricocephalus affinis, Rud. Whip-worm 

 This worm was first reported from Wanganui in 1896, as occurring 

 in the large intestines of lambs. In 1902 Dr Gilruth stated that it 

 was to be found in the cascum of nearly every sheep examined. In 

 1906 it was met with in the csecum of an Angora goat. In 1916 

 Dr Reakes informed me that it was sometimes found in the large 

 intestines of cattle. He did not consider that it did much harm. 



Tricocephalus crenatus, Rud. 

 Colonel Reid reports this species as occurring in pigs in New 

 Zealand. It lives in the intestines of the animal. 



Family Filariid^e 

 Filaria immitis, Leidy 

 The larvae and nematode of this parasitic worm have been found 

 in imported dogs while in quarantine. 



Family Anguillulid^ 

 Tylenchtis devastatrix, Kiihn. Potato Eelworm; Stem Eelworm 



I do not know when this pest was first reported in New Zealand, 

 but it was referred to in the report of the Agricultural Department 

 for 1903, as being present, but not very common. In 1905 it caused 

 considerable damage at Tauranga and elsewhere, especially in heavily 

 manured fields; and was again troublesome in 1907 and 1908. In 

 1906 it was only reported from one locality, but several shipments 

 of potatoes from Tasmania were found to be attacked by it. 



It attacks many kinds of plants, e.g. wheat, oats, hops, clover, 

 and onions, but it is often associated with fungi {Sclerotinia) and 

 it is not easy to determine whether the insect or the fungus is the 

 cause of the disease. 



Either this, or a closely allied species, is found on Holcus lanatus, 

 Anthoxanthum odoratum, Poa annua, Bellis perennts, Capsella Bursa- 

 pastoris, Spergula arvensis, Ranunculus repens, Sonchus oleraceus, Plan- 

 tago lanceolata and Centaurea cyanus. 



Tylenchus tritici {T. scandens), Basstian. Ear-cockle; Peppercorns; 



Purplers 

 This eelworm has been known in New Zealand for many years, 

 Mr T. W. Kirk having met with it first about 1893, but it has never 



