1948] 
Wharton 
— New Peruvian Chiggei 
rs 
99 
Specimen 
AW 
PW 
SB 
ASB 
PSB 
AP 
AM 
AL 
PL 
s 
Type 
72 
83 
28 
32 
17 
20 
55 
35 
69 
76 
508-1 
72 
79 
30 
28 
15 
21 
54 
36 
70 
76 
540-1 
76 
87 
30 
30 
18 
21 
55 
33 
72 
71 
540-6 
72 
87 
30 
28 
18 
19 
41 
35 
62 
540-9 
75 
83 
30 
30 
18 
19 
55 
32 
69 
72 
Mean 
73 
84 
30 
30 
17 
20 
52 
34 
68 
74 
Setce: The dorsal and ventral setae are similar to the 
scutal setae. The dorsal setae are about 60 microns long 
while the ventral setae are about 50 microns. The dorsal 
setae are arranged in fairly regular rows. The type has a 
dorsal setal formula as follows : 2-8-9-6-6-4-2. The 
other specimens have a less regular arrangement that 
begins 2-10. The ventral setae consist of two pairs of 
sternals and about fifty setae posterior to coxae III. 
Material: All specimens were collected by 0. P. Pearson 
at Caccachara, 50 miles SAY. of Have, Peru, at 16,000 feet. 
0. P. Pearson’s # Host 
Date Number of Specimens 
508 
540 
Phyllotis 
boliviensis 
Phyllotis 
darwini 
28 September 4 
1946 
5 October 11 + Type 
1946 (MCZ No'. 3028) 
Diagnosis : Trombicula char a can be readily recognized 
from previously described species of Trombicula in that 
it lacks a pentagonal scutum but does have a mastitarsala 
on leg III. 
Remarks: The types of T. char a and the other new 
species described, as well as half of the other specimens, 
will be returned to the Museum of Comparative Zoology 
at Harvard. One specimen of Euschongastia phylloti , 
Trombicula biops , and Trombicula chara will be sent to 
the U. S. National Museum; a similar series will be de- 
posited at the U. S. Public Health Laboratory in Hamil- 
ton, Montana; one specimen of Euschogastia phylloti and 
one of Trombicula chara will be sent to the South Austral- 
aian Museum; and the remainder will be retained at 
Duke University. 
