POUR NEW PERUVIAN CHIGGERS 
(ACARINA-TROMBICULHUE ) 1 
By G. W. Wharton 
Department of Zoology, Duke University 
The specimens on which this paper is based were col- 
lected by 0. P. Pearson and were obtained through 
Charles Remington from Harvard’s Museum of Com- 
parative Zoology. Their courtesy in transmitting the 
specimens is greatly appreciated. The records of the 
hosts from which these chiggers were removed were 
provided by 0. P. Pearson. 
Six species of chiggers have previously been reported 
from Peru: Crotiscus thomasi (Oudemans, 1910) ; 2 Mega- 
trombicula peruviana (Ewing, 1929) ; Odontacarus au- 
stralis Ewing, 1929 ; Trombicula shannoni Ewing, 1929 ; 
Trombicula japa Ribeyro and Bambaren, 1922; and Eu- 
trombicula alfreddugesi tropica (Ewing, 1928). The 
present paper increases the list to ten. Of the six species 
previously reported M egatrombicula peruviana is known 
only as an adult while Trombicula japa cannot be identi- 
fied on the basis of available information and will prob- 
ably have to become a species incertcc sedis. 
While preparing this paper particular attention has 
been given to the modified setae of the legs. Wharton 
1947 and 1947a has shown that the cliaetotaxy of the legs 
is an important aid to the taxonomic study of larval trorn- 
biculids. As more and more species are studied, it be- 
comes increasingly obvious that it is desireable to name 
these setae. Grandjean 1935 worked out a system of no- 
menclature for the modified setae on the last three, seg- 
ments of the legs of oribatid mites. However, his system 
applied to all instars and so cannot be readily modified 
to fit the present case. Nesbitt 1945 has named the setae 
1 This paper is the result of work done in connection with research sup- 
ported by a grant-in-aid from the Research Grants Division of the U. S. 
Public Health Service and is published with a grant from the Museum of 
Comparative Zoology at Harvard College. 
2 New combination based on unpublished work by H. S. Puller. 
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