NO. 6 CHIGGER SUBGENUS GAHRLIEPIA — TRAUB AND MORROW 45 



three and a half times as long as broad, excluding long petiole (dimen- 

 sions, with petiole: 38 x 9.5 microns). PPW-i in holotype is 120; 

 PPlV-2, 118; PPP-i, 127; PPP-2, 75. Body setae: Dorsal setae 



STANDARD MEASUREMENTS IN MICRONS 



x:Q,c/5'^a,'T:^a, q Coxa II SD ASB Tarsus III 

 Holotype, 



No. B-19409-3 58 96 57 32 197 63 28 so 27/30 96/703:1.37 0.42 3.0 96/64=1.5 



Paratypes (5) : 



Mean S8 98 $9 32 196 60 29 55 23/32 1.40 0.44 3.0 i.S 



Range + or— 2 4 6 i 8 4 2 s 4 0.06 0.05 0.05 0.04 



greatly reduced in number, apparently because of enlarged scutum ; 

 only 10 in number (excluding those usurped by scutum) and these 

 submarginal, short (20 to 47 microns), sparsely plumed. With only 

 about 34 ventral setae, including about 18 postanals. True ventrals 

 about 24 microns in length, thin and with few pinnae. Sternal setae 

 2-2. Legs: Coxae I and II as in G. e.vilis. Coxa III relatively broad, 

 almost as broad (54 microns) as long (59 microns) ; with 2 setae, one 

 anteromarginal and sublateral, the second submedian. Sensory setae 

 as typical for genus. 



Type material. — Holotype (No. B-19409-3) ex Rattus whiteheadi 

 •whiteheadi Thomas, North Borneo, Mount Kinabalu, Tenompak, 

 elevation 4,500 feet (R. Traub, for joint U. S. Army-Colonial Office 

 Medical Research Unit), August 29, 1953. Four paratypes with same 

 data ; a fifth, ibid., but July 16, 1951, and from the same host or from 

 Rattus cremoriventer kina Bonhote. Holotype (U.S.N.M. No. 2169) 

 and one paratype deposited in U. S. National Museum. One paratype 

 in collection of Colonial Office Medical Research Unit, Kuala Lumpur, 

 Remainder in collection of senior author. 



Comment. — The possibility that this is a chigger that burrows 

 into the subcutaneous tissues of the host is discussed after the de- 

 scription of the next species, a true burrowing form. 



GAHRLIEPIA (GAHRLIEPIA) PENETRANS, new species 



Figures 133-141 



Diagnosis of larva. — Unique in the genus in that the scutum at its 

 maximum is as broad as long, instead of being one and a quarter to 

 two times as long as broad. Separable from known Gahrliepia, except 

 for G. (G.) ampullata, new species, by each of the following: With 

 2 setae on coxa III ; eyes contiguous with scutum ; with an inter- 

 sensillary crater, i.e., a huge scrobiculus extending from level of SB 

 to near anterior margin (fig. 136, I.C.). Readily distinguishable from 



