Biologu of H. leach i 539 



Longevity of unfed H. leachi. 



The longevity of the unfed tick is reckoned from tire date of its emergence from the egg 

 in the case of the larva, from the larval sikin in the case of the nymph, from the 

 nyniphal skin in the case of the adult. 



Remarks 

 Still lively after 50 days at 13 C. In jar on earth. 

 Dead after 44 days at 17''C. ,, „ 



Of the progeny of 32 ? 's isolated in Feparate corked tubes at 

 room-temperature in semi-darkuess, 8 lots were found dead 

 after 322, 355, 360, 360, 362, 376, 376 and 400 days respec- 

 tively ; about 25 •'/q of the larvae, composing each of the 

 remaining 24 lots, survived for 354-378 days when they were 

 used for raising experiments*. 



* Note added since the publication of the paper from which this is extracted. 



Nymphs. 



1737 I 7. XII. 1912 Lively after 61 days at 12° C. Then raised to adults. 



Adults. Keceived vii. 1903 from Cape Colonj', survived ca. 210 days at room temperature, 

 and when placed on a dog produced infection with piroplasmosis. 



Observations relating to oviposition, etc. 



* This holds for 33 out of 35 ? 's, the two remaining oviposited on days 9 and 12 

 respectively. 



Summary. 



Haemaphysalis leachi requires three hosts upon which to feed during 

 its hirval, nyniphal and adult stages. It readily attaches itself to the 

 host at each stage in about a week after- ecdysis. It is easily reared 

 under experimental conditions upon a number of different hosts (jackal, 

 dog, ferret, hedgehog, goat, rabbit), and it appears to be iin material 

 upon which of these hosts it feeds. The larva and nymph remain 

 attached to the host for 8-7 days (2-3 days, Lounsbury), occasionally 

 longer; the females remain attached longer, i.e. 8-16 days. The males 



