194 
R. TRAUB 
subapically, terminating at apex of rod-like apical sclerite of inner tube ( A.S.T ) which in turn arises from 
dorsal angle of sclerotized inner tube ( S.I.T ). Agrees with Strepsylla in possessing a distodorsal lobe 
( D.L ) (Traub and Johnson, 1952); this structure well developed, subcordate or subovate, and arising from 
apex of A.S.T , at junction with M.D.L. Lateral lobes (L.L) weakly sclerotized. Crochets apparently 
absent. Sclerotized inner tube subhorizontal, slightly angled ventrad at midpoint ; with a proximal 
dorsal knot-like thickening representing the armature of the inner tube ( A.I.T ). Crescent sclerite ( C.S ) 
well developed. Lobes of apodemal strut differentiated into a conspicuous lateral ventral sclerite ( L.S ), 
a more lightly sclerotized subacute mesal sclerite (M.S) and a broader, somewhat rounded dorsal sclerite 
( D.S ). The vesicle (V) at end of intramural rod (I.R) lightly sclerotized but nevertheless visible. 
Tenth abdominal segment with dorsal lobe of proctiger ( D.A.L , fig. 15) very well developed, subovate, 
or conical, about three to five times as long as broad at base (depending upon position when mounted); 
with about eight or nine bristles, some stout. Ventral lobe of proctiger ( V.A.L ) more lightly sclerotized, 
with two long apical bristles; with a well- developed subanal sclerite (V.P). 
Modified Abdominal Segments , Female (fig. 19). Caudal margin of seventh sternum ( 7S ) with a fairly 
broad sinus near ventral margin; the upper lobe angulate, but broad; the lower lobe somewhat rounded; 
with a row of about six or seven long bristles per side, preceded by an irregular row of about six smaller 
bristles and two or three ventromarginal bristles. Eighth tergum ( 8T ) with three or four small bristles 
above long thin spiracle, and with two long bristles near base of ventral anal lobe (V.A.L ) ; in addition with 
four long caudomarginal bristles, two shorter caudomarginal bristles between the last two long ones, 
three lateromedian bristles and a group of four mesal submarginal bristles ventrad to V.A.L. Eighth 
sternum ( 8S ) long and narrow, subacuminate; lacking a bristle. Dorsal anal lobe of proctiger (D.A.L) 
with a dorsomarginal fringe of bristles and about four smaller scattered bristles ; with a bristle at base of 
anal stylet. Ventral anal lobe (V.A.L and fig. 21) not heavily sclerotized nor angulate; with a proximal 
group of five marginal bristles, one of which is short, and a subapical group of two bristles, of which the 
marginal one is quite long. Anal stylet (A.S and fig. 21) about three times as long as broad at base, with 
a long apical bristle and a very small contiguous one. Spermatheca (SP. and fig. 17) with head subovate, 
longer than broad, and tail longer than head, rather upturned. Bursa copulatrix (B.C) subovate, its duct 
rather well sclerotized and fairly straight. 
Types . — Holotype male and allotype female ex Rattus infraluteus , Mt. Kinabalu, North Borneo. 
Holotype collected at Kamborangah, elevation 7,800 feet, 7 July, 1951; allotype at Tenompok, elevation 
4,500 feet, 18 July, 1951; both collected by R. Traub and deposited in the U.S. National Museum 
(Holotype, U.S.N.M. No. 61807). Paratypes: Two males, one female with same data as holotype; one 
male and one female with same data as allotype; one male ex Rattus infraluteus , collected by J. R. Audy at 
Tenompok, 30 May, 1952. 
Comment. — Rattus infraluteus is apparently the true host of this flea. Despite intensive 
collecting, no other specimens were taken on any other rats or tree shrews in the same locality. 
Summary 
Sigmactenus alticola n. sp. and Neopsylla luma n. sp. from Mt. Kinabalu, North Borneo, 
are described and figured in detail. S. alticola n. sp. is a characteristic parasite of Rattus 
alticola and is readily separated from S. werneri Traub 1950 by the modified abdominal segments. 
The absence of a prominent median tuft of bristles on the male ninth sternum is diagnostic. 
N. luma n. sp. has been collected only on Rattus infraluteus. It is near N. dispar Jordan 1932 
but is immediately separable by the modified abdominal segments, particularly the narrow 
distal arm of the male ninth sternum and the short, broad, more rounded digitoid. 
References 
Harrison, J. L. and Traub, R. (1950). On a collection of rodents and insectivores from Selangor, 
Malaya. J. Mammal ., 31, 337-346. 
Johnson, P. T. and Traub, R. Revision of the genus Peromyscopsylla I Fox, 1939 (Siphonaptera). 
(In press). 
Traub, R. (1950). Sigmactenus , a new genus of flea from the Philippines (Siphonaptera). J. Wash. 
Acad. Sci. 3 40, 371-378, figs. 1-14. 
Traub, R. and Johnson, P. T. (1952). Four new species of fleas from Mexico. Amer. Mus. Novit., 
1598, 1-28, figs. 1-53. 
STUD. INST. MED. RES. 
