TROMBICULA FROM BORNEO 
47 
Anterior margin sinuate, convex at shoulders and midpoint ; lateral margins shallowly concave; posterior 
margin slightly biconvex, medially indented. Sensillary bases almost in a line with PL, but actually very 
slightly anterior to them. Sensillae nude for most of their length but subapically somewhat frayed; 
about 62\l long. AL setae about 3/5 length of PLs; both pairs with barbs closely appressed to axis, barbs 
inconspicuous, particularly in PLs. Body Setae: Similar to scutal setae in size, shape and high degree of 
appression of barbs. Dorsal setae about 30, counting terminals, arranged 2. 8. 6. 6. the rest irregular. 
True ventral setae (about 33\x) plumose, fairly long, about 8 in number plus about 8 caudal setae, similar 
to dorsals but about 36-38(0. long. Non-sensory setae of legs with thin barbs, often appressed, not long 
and thin as in T . flagellifera n. sp. Legs: Sensory setae as follows: Leg I and II as in flagellif era. Leg III 
with mastifemorala on telofemur actually somewhat frayed proximally, about 48(0. long or about as long as 
tibia; a mastigenuala (almost nude seta about 35(0.) with an adjacent seta about one-half its length, tibia 
with 2 nude setae. 
Standard Measurements in Microns, T. tuhana n. sp. 
AW 
PW 
SB 
ASB 
PSB 
A-P 
AL 
AM 
PL 
DS 
PW 
Cox II 
PW 
SD 
PW 
ASB 
PW r 
A-P 
Holotype 28540 ... 
61 
66 
26 
22 
10 
24 
29 
33 
56 
50 
66/57 
= 1.16 
68/32 
= 2.0 
66/22 
= 3.0 
66/24 
= 2.75 
Paratypes (7) Mean 
59 
65 
26 
21 
10 
23 
3i 
33 
55 
49 
1.20 
2.1 
3.07 
2.8 
Range (-for-) 
2 
3 
1 
2 
1 
2 
3 
3 
4 
3 
0.05 
0.07 
0.08 
0.07 
Type Material: Holotype (C.O.R.U. 28540) and 13 paratypes ex Nannosciurus whiteheadi, the pygmy 
tufteared squirrel, Mt. Kinabalu, Bundu Tuhan, elev. approx. 4000 ft., 7. vi. 1952 (J. R. Audy). Holotype 
(U.S.N.M. 2012) in U.S. National Museum, paratypes in British Museum and authors’ collections. 
Trombicula vorca n. sp. (figs. 17-24, pp. 56, 57). 
Diagnosis of Larva . — Immediately separable from most Trombicula by the following 
combination of characters : a large conspicuous sclerotized or deeply pigmented anterior eye, 
which is relatively far removed from the scutum, posterior eye virtually inapparent or vestigial, 
and a palpal formula B/B/NNb. Agrees with T. corvi Hatori, 1920, in apparently possessing 
but a single large eye and with stout heavily barbed setae on palpal femur and genu, but readily 
separable as follows (taking the features of T . corvi after Womersley, 1952) : Sensillae apically 
frayed, proximally nude, instead of vice versa ; scutum submedially not “backwardly” curved ; 
with only about 70 dorsal setae, not over 100 ; with a humeral row of 6 or 8 dorsal bristles, 
followed by a row of 10 or 12, instead of a setal formula commencing 12. 10. 16 ; ventral palpal 
tibial bristle sparsely branched or frayed, not nude. 
Description of Larva . — Engorged specimens huge, subquadrate, about 1135x875(9. when mounted. 
Eyes pigmented, spherical, removed from scutum a distance equal to own diameter (22 (9 when measured 
at level when scutum is in focus); large anterior eye heavily chitinised, at a level slightly behind that of ALs; 
posterior eye represented but by a dim ovate vestige beyond sclerotized plate of anterior eye ; an occasional 
specimen with a suggestion of an ocular plate about posterior eye. Gnathosome: Chelicers with subapical 
notch on inner surface. Galeal seta nude. Palpae with seta on femur and genu stout, heavily barbed or 
subpectinate ; dorsal and lateral tibial setae stout, nude; ventral tibial bristle subapically frayed or ciliated. 
Palpal claw trifurcate. Scutum: Subrectangular ; somewhat less than twice as broad as long; lateral 
margins almost parallel; anterior margin very slightly concave and with virtually no “ shoulders ” at inser- 
tions of ALs, which are not contiguous with margin; posterior margin somewhat convex opposite level of 
sensillae bases, elsewhere slightly concave; scutal setae with many short barbs; PLs the longest. Sensillae 
with branches commencing just at midpoint and extending to apex. 
Standard Measurements in Microns, T. vorca n. sp. 
AW 
PW 
SB 
ASB 
PSB 
A-P 
AL 
AM 
PL 
DS 
PW 
Cox II 
PW 
SD 
PW 
ASB 
PW 
A-P 
Holotype ... 
80 
92 
29 
40 
17 
40 
65 
59 
80 
64 
92/75 
= 1.23 
92/57 
= 1.6 
92/40 
= 2.3 
92/40 
= 2.3 
Paratypes (4) Mean 
82 
93 
28 
40 
17 
42 
66 
59 
78 
62 
1.20 
1.6 
2-3 
2.2 
Range 
3 
4 
— 
3 
2 
2 
3 
3 
4 
5 
0.05 
0.05 
0.03 
0.08 
Body Setae: With about 52-72 dorsal setae apparently arranged 6(8). 10. 12. the rest irregular; 
similar to PLs. With about 14-18 caudal (postanal ventral) setae, circa 60 (x, resembling DS. True 
ventral setae about 58 in number progressively ranging from 36-5514, approaching postanals. Legs: 
Sensory setae as follows : Leg I with two genuala and a microgenuala ; with two approximated tibialae and 
MALAYA , No. 26. 1953 
