10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



ex Rattus fulvescens fulvescens, and once on a tree shrew, Tupaia. 

 In March, whenever this species was found, it was the dominant form 

 present on the host — four times out of five over 92 percent of the 

 chiggers examined were G. exilis. The above Tupaia carried over 

 200 trombiculids, and all of 50 examined were G. exilis. In April, 

 when G. exilis occurred, it usually constituted 20 to 30 percent of the 

 chiggers sampled. The usual site of attachment of G. exilis was on 

 the perineum or external genitalia of the host. This chigger did not 

 readily detach from the host, and at times could be found firmly in 

 situ 24 to 48 hours after death. 



GAHRLIEPIA (GAHRLIEPIA) FIMBRIATA, new species 



Figures 11-18 



Diagnosis of larva.— Agrees with G. (G.) exilis, new species, in 

 that there are four usurped marginal setae on the scutum ; separable 

 in that the AL setae are much shorter, approximately 45 microns, 

 not 68, and much less bushy ; the punctations on the scutum are of two 

 sizes, not all subequal ; the PL setae are much closer to AL than to 

 PPL-i, instead of being midway; the palpal formula B/B/bNB 

 instead of all being plumed. 



Description of larva.— Body: Subovate, about 305 x 188 microns 

 in partially engorged holotype. Eyes 2 + 2; anterior eye the larger. 

 Gnathosonia: Chelicerae about four and a half to five times as 

 long as broad at base ; with a distinct tricuspid cap. Palpal setal for- 

 mula B/B/bNB; the femoral and genual setae thinly subpectinate. 

 Palpal claw 3-pronged. Scutum: Essentially as G. exilis regarding 

 shape; 132 x 90 microns. Micropunctations densely and uniformly 

 scattered, but with additional, much less numerous, coarser punctae 

 about I to 2 microns in size, especially noticeable toward rear of scu- 

 tum. Scutal setae rather bushy, but pinnae short. AL setae about 

 two-thirds length of PL. Sensillae bases inserted almost at level of 

 PLs. The mean distance in microns between the first (anteriormost) 

 pair of usurped setae {PPL-i), is 80 (PPlV-i), with a range ±8. 

 Mean distance between second pair of usurped setae {PPL-2) is 49 

 (PPIV-2), ±5. Distance from first pair of usurped setae to poste- 

 rior margin of scutum is 68 (PPP-i), ±7. Distance from PPL-^ to 



STANDARD MEASUREMENTS IN MICRONS 



Holotype, U.S.A.T.C. ^Q^^-^a, -^^q^Q Coxa II SD ASB Tarsus III 



PaStypes'^W : "^^ ^' ^^ ^^ '°^ ^^ "2 60 48 71/59=1.20 0.54 3-09 71/70=1.01 



Ra^geVo'r'- ^t ^t ^\ 'I ''t "'7 44 66 50 1.24 0.58 3.0 1.09 



^ -ror 3 s 3 2 8 2 3 s 4 0.05 0.08 0.1 0.08 



