96 
Psyche 
[June 
genuala, a tibiala, blit no whip-like setae. Each leg is 
terminated by a pair of lateral ambulacral claws that 
flank a median longer and thinner claw-like empodium. 
Scutum: The scutum is definitely pentagonal in shape. 
It is ornamented by closely set, irregularly placed punctae. 
The pseudostigmata are small and bordered by short 
anterior and posterior ridges. The sensillae are peculiar 
in that they have extremely short fine barbs along their 
entire length. The scutal setae are provided with short 
barbs over their entire surface. The Standard Data 
follow: 
Specimen 
AW 
PW 
SB 
ASB 
PSB 
AP 
AM 
AL 
PL 
S 
Type 
70 
86 
28 
35 
41 
30 
48 
40 
59 
72 
508-1 
69 
90 
25 
35 
39 
29 
46 
44 
62 
83 
508-2 
70 
89 
28 
35 
36 
26 
41 
39 
57 
75 
508-4 
72 
91 
26 
35 
36 
31 
48 
35 
58 
76 
540-2 
67 
79 
26 
28 
29 
25 
35 
29 
47 
Mean 
70 
87 
27 
34 
36 
28 
44 
37 
57 
77 
Setce: Dorsal and ventral setae similar to scutal setae 
about 40 to 50 microns long. Dorsal setae irregularly 
arranged. A pair of humeral setae present followed by 
an irregular band of about 16 setae, behind these anterior 
dorsal setae there are about 40 posterior dorsal setae. The 
ventral setae are arranged in more definite rows than the 
dorsal setae but they are also too irregular to permit a 
setal formula. Two pairs of sternal setae in all eight 
specimens examined but the type is unusual in that it 
bears an extra median seta between the first pair of 
sternal setae. Posterior to the last pair of coxae there are 
about 40 setae arranged in irregular rows. 
Material: Collected by 0. P. Pearson at Caccachara, 
50 miles S.W. of Have, Peru, at an altitude of 16,000 feet. 
O. P. Pearson’s # Host 
Phyllotis 
508 boliviensis 
540 Phyllotis 
clarwini 
Date Number of Specimens 
28 September 5 
1946 
5 October 2 + Type 
1946 (MCZ No. 3029) 
Diagnosis: As mentioned under the discussion of Trom- 
hicula pearsoni , T. biops is morphologically similar to it. 
T. biops can be separated from T. pearsoni on the shape 
