46 TRAUB & AUDY 
Trombicula flagellifera n. sp. (figs. 1-8, pp. 52, 53). 
Diagnosis of Larva . — Immediately separable from all known Asiatic species in the genus 
by the presence of four very long whip-like setae on the hind legs, of which the mastifemorala 
is usually well over 105^ in length, ranging as high as 160^. 
Description of Larva. — Body: Subovate, about 282(4. long (including mouth-parts) by 176 broad in 
fairly engorged specimen. Eyes 2+2, anteriormost circular, about nxiipi, posterior eye subovate 
about 10.5 x 9.6(4.. Gnathosome: Chelicerae about 2\ times as long (13(4.) as broad at base (5pt) ; each with 
a small subterminal tooth and a distinct, more proximal, ventral tooth or nubbin. Palpal coxae and femora 
punctate. Palpal formula N/N/NNN (i.e., all setae nude); palpal tarsus with a basal striated rod and 
about 5 bristles, 4 of these heavily plumose, one (subapical) apparently nude. Palpal claw 3-pronged; 
axial prong slightly curved, stout; dorsal straight, slender, inconspicuous; dorsoventral straight, short and 
fairly stout. Galeal seta N (i.e. nude). Scutum: Punctate; roughly rectangular; dimensions 47 x 83 EG 
lateral margins almost straight and parallel; anterior margin slightly concave; shoulders at AL rounded; 
posterior margin sinuate, producing 3 shallow sinuses. Scutal setate with short barbs; similar to dorsal 
setae in size and shape; PLs inserted at angles slightly posterior to level of SBs; PL longer than AL. 
Sensillae long, about 68-90(4., virtually nude, tapering occasionally with a subapical branchlet. Body 
Setae: Dorsal setae similar to scutal setae; about 28-32, counting marginals arranged 2. 8. 6. 6. 4.2. 
One pair of plumose or subpectinate sternal setae between bases of coxae I and another pair between 
coxae III. True ventral setae about 36(1, subpectinate or plumose, about 8-12 plus 8 postanal caudal 
setae. Legs: All 7-jointed, coxae and legs punctate. All coxae unisetose; on first two coxae the seta is 
submarginal, near posterolateral angle; on coxa III the seta is median, at level of anterior fourth of segment. 
Non-sensory setae with unusually long, delicate but well-separated plumes or barbules. Sensory setae 
as follows Leg 1:2 genualae and microgenuala ; 2 stout tibialae (1 subapical) and a microtibiala ; a blunt 
striate tarsala (“spur” of Wharton) and a microtarsala (microspur) distal and slightly posterior, subter- 
minala stout, with parasubterminala one-half its length, pretarsala well-developed. Leg II: a genuala; 
2 well-developed tibialae in tandem, a blunt striate tarsala with anterior microtarsala, a pretarsala. 
Leg III: a conspicuous mastifemorala about 110-160(4. long; a mastigenuala about 95-110(4. and a normal 
genuala; a mastitibiala of about 60-90(4. immediately distal to a tibiala; with a nude or sparsely plumed 
subproximal mastitarsala, about 4554. long; flagellate setae are apparently easily broken or lost in the 
preserving or mounting processess, if not in life. Their bases may show a few delicate ciliations or 
barbules. 
Type Material . — Holotype (C.O.R.U. 20948) ex Crocidura , a shrew. North Borneo, Mt. Kinabalu, 
Tenompok, elev. 4,500 ft., 16. vii. 1951 ( R . Traub and J. R. Audy for U.S. Army and Colonial Office Research 
Units). 29 larval paratypes loc. cit. but as follows: 2 ex Nannosciurus whiteheadi , a pigmy tuft-eared 
squirrel; 19 ex Hylomys suillus (Erinaceidae), a “short-tailed shrew”, vii. 1951 (JR. Traub and J. R. Audy) 
and 19 ex Hylomys suillus 27. v. 1952 (J. R. Audy). Holotype (U.S.N.M. 2101) deposited in U.S. National 
Museum; paratypes in collections of the British Museum, South Australian Museum; Rocky Mountain 
Laboratory, Hamilton, Montana ; in other institutions and in the authors’ collections. 
Standard Measurements in Microns, T. flagellifera n. sp. 
AW 
PW 
SB 
ASB 
PSB 
A-P 
AL 
AM 
PL 
DS 
PW 
Cox II 
PW 
SD 
PW 
Asb 
PW 
A-P 
Holotype ... 
72 
77 
26 
3 i 
12 
33 
52 
55 
67 
60 
77/70 
= 1.1 
77/43 
= 1.8 
77/31 
=2.47 
77/33 
= 2.3 
Paratypes (29) Mean 
72 
79 
26 
3 i 
12 
3 i 
54 
52 
68 
60 
1. 12 
1.8 
2.52 
2.4 
Range ( + or — ) 
3 
4 
1 
3 
I 
2 
4 
4 
4 
3 
o.o 5 
O.I 
0.08 
0.03 
Trombicula tuhana n. sp. (figs. 9-16, pp. 54, 55). 
Diagnosis of Larva . — Near T. flagellifera n. sp. especially in that palpal setae are nude and 
in that Leg III bears fairly long sensory setae, including a mastifemorala. Readily separable 
in the absence of long whiplike setae on Leg III, the mastifemorala about 47^ long, not over 
ioojl Further distinguishable in that the scutum is smaller and relatively narrower, i.e., PW 
about 65, not 78; ASB about 21, not 31 and ratio of PW/ASB is approximately 3. 1, not 2.55; 
sensillary bases virtually in fine with PL, not definitely at an anterior level. Galeal seta 
branched. 
Description of Larva. — Body: About 258 by 203(4 in partially engorged specimen. Anterior eye (9(4.) 
somewhat larger than posterior eye (8(4.), each subovate to circular. Gnathosome: Chelicerae about three 
times as long as broad at base. Scutum: Subrectangular, slightly less than half as long as broad (32 x 67 p.) 
STUD. INST. MED. RES. 
