Chiggers from Southern Korea — JAMESON AND Toshioka 
17 
DIAGNOSIS: Palpal femoral, genual, and lat- 
eral tibial setae nude; dorsal and ventral tibial 
setae feathered. Galeal seta feathered. Cheli- 
ceral base with numerous punctae. Seta on 
coxa III on anterior margin of coxa. Dorsal 
setal formula: 2-8-8-8-2-2. Scutum with 
posterior corners rounded; sensillary bases 
far behind a line connecting posterolateral 
setae. Sensillae with conspicuous, divergent 
basal barbs; plumose distally. Scutal measure- 
ments of a southern Korean specimen: AW- 
66, PW-67, SB-31, ASB-29, PSB-14, AP-18, 
AM-45, AL-40, PL-59, S-63. 
DISTRIBUTION AND HOSTS: From many lo- 
calities in southern Korea from Apodemus 
speciosus, A. agrarhis, Kattus rattus, and R, 
norvegicus. Described from wild rodents from 
U.S.S.R. 
TYPE DATA: Described from Clethrionomys 
rufocanus and Apodemus speciosus, South Shore, 
vicinity of Barabasha, U.S.S.R. 
Trombicula (Leptotrombidium) 
pallida Nagayo et al., 1919 
Trombicula pallida Nagayo, Mitamura, and 
Tamiya, 1919. Jikken Igaku Zasshi 3: 
265-312. 
T. hurnsi Sasa, Teramura, and Kano, 1950. 
Tokyo Iji Shinshi 67(10): 22. 
T. murotoensis Sasa and Kawashima, 1951. 
Tokyo Iji Shinshi 68(12): 16. 
DIAGNOSIS: Palpal femoral, genual, and lat- 
eral and ventral tibial setae nude; dorsal tibial 
seta feathered. Galeal seta feathered. Scutum 
more or less rectangular, with the postero- 
lateral setae in the anterior part of the rounded 
posterior corners. Sensillary bases slightly be- 
hind posterolateral setae. Bases of sensillae 
with small but conspicuous and divergent 
basal barbs; distal two thirds plumose. Seta 
on coxa III well behind the anterior margin 
of the coxa. T. pallida is a highly variable 
species, especially with regard to the number 
of dorsal setae; but the short, bushy char- 
acter of the dorsal setae and the nature of the 
scutum, sensillae, coxae, and gnathosoma are 
fairly constant. Scutal measurements of a spec- 
imen from southern Korea: AW-64, PW-72, 
SB-36, ASB-29, PSB-14, AP-21, AM-55, AL- 
38, PL-56, S-61. 
DISTRIBUTION AND HOSTS: In Korea this 
species has been taken 13 miles southeast of 
Yonchon and 7 miles southeast of Chorwon, 
from Rattus norvegicus and Apodemus agrarius. 
Previously T. pallida was known only from 
Japan. 
TYPE DATA: Lectotype selected from spec- 
imens collected by the original authors a- 
Yachi, Yamagata Prefecture, 1919, from Mk 
crotus montehelloi. Deposited at the Institute 
for Infectious Diseases, University of Tokyo. 
Trombicula (Leptotrombidium) 
subintermedia n. sp. 
Fig. 4 
This species is allied to Trombicula inter- 
media Nagayo et al. of Japan and T. lanceolata 
Womersley of the tropical Orient. 
DESCRIPTION: Gnathosoma: Palpal femoral, 
genual, and lateral and ventral tibial setae 
nude; dorsal tibial seta feathered. Galeal seta 
feathered. Palpal claw three-pronged. Cheli- 
ceral base and palpal femur with punctae. 
Chelicera with a dorsal subapical notch. Scu- 
tum: More or less rectangular, slightly more 
than twice as wide as long, with delicate 
punctae; rear corners rounded. Sensillary bases 
slightly behind a line connecting the postero- 
lateral setae. Sensillae nude basally (minute 
barbs visible on some specimens), plumose 
distally. Scutal measurements of holotype: 
AW-70, PW-77, SB-31, ASB-27, PSB-20, 
AP-25, AM-50, AL-36, PL-63, S-67. Legs: 
Coxal setae 1-1-1; seta on coxa III consider- 
ably behind anterior margin of coxa. Special- 
ized (nude) setae on legs: Leg I, 2 genualae, 
1 microgenuala, 2 tibialae, 1 microtibiala, 1 
spur, 1 microspur, 1 subterminala, 1 para- 
subterminala, 1 pretarsala; Leg II, 1 genuala, 
2 tibialae, 1 spur, 1 microspur, 1 pretarsala; 
Leg III, 1 genuala, 1 tibiala. Setae: Dorsal 
setae moderately short and well provided with 
