TERRESTRIAL ACARI OF THE TYNE PROVINCK 6l 



g. Zerconiforin ; dorsum pitted or sculptured ... ... Zerconopsis. 



Oval; smooth or very slightly scabrid ... ... lo 



ID. Dorsal setre crassate ; no ventro-lateral scutellum ... Amcroseius. 



Trichomes normal ; ventro-lateral scutellum present 1 1 



II. Pulvillus trifid, the lobes narrow acute ... ... Episeius. 



Pulvillus normal ... ... ... ... ... Lasioseius, 



MYONYSSUS, Tiraboschi, 1904. 



Type : decumani^ Tir. 



There are two postero-lateral tubercles on the dorsal 

 shield. Anal scutum large, wider than long. 



I. Five ridges, longitudinal, on the dorsum ... ... gig(is. 



Dorsal ridges not marked ... ... ... ... decnmani , 



68. MyonyssLis decumani, Tir. 67. 



Ninebanks, on the common rat. 



Shetland Islands, on house mouse (Waterton). 



69. Myonyssus gigas, Oud. 67. 



Ninebanks: ^wwA^Xitoxi Miis silvaticus ; occasionally 

 in moles' nests ; frequent in nests of Sorex vulgaris. 



Scotland (Ayrshire — J. Gloag). 



LAELAPS, Koch, 1842. 



Type : agtiis, Koch. 



§i. Dorsal scutum scabrid, reticulate, covering the 

 whole dorsum, pubescence pretty dense, practically 

 uniform. Ventral shield large, similarly pubescent ; 

 anal plate contiguous, much wider than long. 

 Hemilaelaps (type : stabiilaris). 



I. Sternal scutum as wide as long ... ... ... echidnimis. 



,, wider than long stabiilaris. 



§ii. Dorsal scutum not covering the whole dorsum, 

 pubescence sparse, irregular, very spiny, usually a 

 few long spines behind. Ventral shield small, 

 with 3 (or 4) pairs of spines. Laelaps proper. 



I. Lateral anal spines very small ... ... ... festivus. 



Anal spines sub-equal ... ... ... ... ... 2 



