FEEDING TIMES 
179 
The percentages shown in Fig. 4 and on the right of the diagram have been transformed to angles in order 
to straighten the sigmoidal curve of Fig. 4. 
conform with current nomenclature. For each species the statistics are shown separately for 
each source, and the numbers of mites and hosts on which they are based is indicated. Thus 
“ 1 day (43/13) ” signifies that from “ i day rats ” forty-three mites from thirteen rats were 
timed. Hosts for laboratory bred mites are white mice., for other mites rats of the genus Rattus 
unless otherwise indicated. The rat hosts of any one mite usually comprise several of the 
following species : 
Rattus rattus argentiventer R. mulleri 
R. r. diardii R. bower si 
R. r. jalorensis R. sabanus 
R. exulans R. rajah (including R. surifer ) 
The hosts of Trombicula rara were skinks (lizards) of the species Mabuya multifasciata. 
Abbreviations used in List i 
Laboratory : information obtained from laboratory breeding of mites 
1 day: from marked rats captured within one day of release 
2 day: from marked rats captured within two days of release 
Wild: from unmarked rats (mean estimated from angular transformation, mode from 
mean mode, range from both) 
Mn: Arithmetic mean (-f- standard error for “ i day ” timings) 
md: Mode 
rg: Range (upper limit only) 
rg, 95% time group within which 95% of the chiggers have fed 
rg, m.m maximum estimated from mean mode 
rg, 100% maximum estimated from angular transformation 
MALAYA, No. 26. 1953 
