180 J. L. HARRISON 
LIST i 
Chiggers for which extensive data are available 
4. Trombicula ( Eutrombicula ) wichmanni (Ouds.): 
2 day (1/1) 5 days 
Wild (27/12) ... Mn = 3 
md = 4 ... 
rg i mm = 4 ... 
100% =4 
6 . 
T. akamushi (Brumpt) 
Laboratory (2,665/31) Mn= 2.1 + 0.1 
md= 2 ... 
^95% =4 
1 day (78/11) ... 2. 8+0-2 
3 ... 
5 
2 day (82/4) 3.2 
3.6 
4 
Wild (3,636/30) ... 2.4 
44 
rg,mm =6 ... 
100% =5 
7* 
T. dehensis (Walch) 
Laboratory (723/19) Mn= 3.4+0. 1 
md = 3 ... 
^95% =6 
1 day (43/13) ... M«=+o(3.6*)+o.3 ... 
md =2 ... 
r g> 95% =7(9*) 
2 day (19/4) 2.8 
3 ... 
3 
Wild (649/35) - 2.9 
4 ••• 
rg,mm =6 ... 
199% =8 
13A. 
T. sp. nr. bodensis 
Wild (625/12) ... Mn = 7 
md =6 ... 
rg,mm = 10 ... 
100% = 10 
14- 
T. keukenschrijveri Walch 
Wild (134/11) ... Mn = 4 
mi=4 ... 
rg,mm=j ... 
100% = 8 
16. 
T. burmensis Ewing 
2 day (2/1) both 2 days 
Wild (4/3) Mn=2.s 
md=i ... 
rg ) mm= 3, ... 
100% =3 
17- 
T. muridia Womersley 
Wild (15/3) ... Mn= 3.5 
m 
II 
s 
rg,mm —6 ... 
100% =5 
18. 
T. consueta Womersley 
Wild (13/3) ... Mn = 11 
md=% ... 
rg,mm=i 2 ... 
100% =15 
22. 
T. hastata Gater 
1 and 2 day (4/2) three for 9 days, one 8 days 
Wild (7/4) Mn = 10 
0 
►H 
II 
rg,mm~ 12 ... 
100% = 19 
25. 
T. parmifera Womersley 
Laboratory (1 3/1) all 2 days 
27- 
T. rara Walch (on skinks) 
Wild (60/2) ... Mn = 13 
md—I 5 , 
rg ) mm = 40 ... 
100% =30 
36. 
Blankaartia[Tragardhula\ acuscutellaris (Walch) 
Wild (25/2) ... 
VO 
II 
rg,mm = 10 ... 
I00% = 12 
38. 
Euschongastia ( Walchiella ) oudemansi (Walch) 
1 day (1 1/2) Mn= 8. 4+1.0 
md=n 
t?,95% = 11 
Wild (372/12)1 ... 18 
12 
rg,mm = 19 ... 
100% =32 
50. 
Euschongastia lacunosa (Gater) 
Wild (51/9) ... 7 
md= F j ... 
rg,mm=i 3 ... 
100% =18 
58. 
£. n. sp. nr. rawz 
Wild (19/4) ... Mn= 2 i 
md = 26 
rg,mm=34 ... 
100% =40 
59- 
E. n. sp. No. C.O.R.U.-21799 
Wild (7/4) Mn=i 
md=^ ... 
rg,mm = 5 ... 
100% =6 
* including abnormal excreme value f but most of these chiggers were on 2 rats 
STUD. INST. MED. RES. 
