NO. 6 CHIGGER SUBGENUS GAHRLIEPIA TRAUB AND MORROW 75 



STANDARD MEASUREMENTS OF HOLOTYPE IN MICRONS * 



^^tt,£?^ °.^^ p^ n^ fK p^ 



^a,D5'^tt, ^^Q, Coxa II SD ASB Tarsus III 

 50 86 so 28 157 so 39 42 ••• 0-47 3-1 



* After Womersley, modified. 



Type material. — Holotype ex Rattus rattus, Hong Kong, 1950 

 (J. D. Romer). Deposited in collections of South Australia Museum, 

 Adelaide. No other specimen known. 



Comment. — This specimen is known to us only through the original 

 description. 



KEY FOR THE IDENTIFICATION OF THE LARVAE OF THE 

 SUBGENUS GAHRLIEPIA 



I Scutum scrobiculate ("ornate"), i.e., bearing large pits, 



many of which are at least twice the diameter of the setal 

 bases (often much larger), in addition to the usual micro- 



punctae (figs. 86 and no) 2 



Scutum not scrobiculate, often bearing only micropunctae 

 (fig. 5) but also at times with secondary punctae no 

 larger than setal bases (fig. 15) 12 



2(1) With 2 setae on coxa III (fig. 134) ; intersensillary crater 



present (fig. 129, I.C.) 3 



With only i seta on coxa III (fig. 85) ; lacking an inter- 

 sensillary crater (fig. 145) 4 



3(2) Lateral margins of scutum mildly sinuate, lacking scallops 



(fig. 136) ; scrobiculi smoothly ovate penetrans, n. sp. (p. 45) 



Lateral margins of scutum definitely scalloped (fig. 129) ; 



scrobiculi with crenulate margins ampullata, n. sp. (p. 43) 



4(2) PW is 90 microns or greater; with 4 usurped ^2 setae, 



which are median in position (fig. no) 5 



PW yo microns or less; either with more than 4 usurped 

 setae (fig. 94) or with 4, but these are marginal in posi- 

 tion (fig. 102) 7 



5(4) With base of chelicera posterolaterally produced into a dis- 

 tinct, broad dorsal flap (fig. in, FL) ; ALs and PLs 

 very long, over no microns in length; PLs reaching far 

 beyond bases of first usurped setae (PPL-i) (fig. no) ; 

 coxa III about li times as long as broad (fig. 109). 



laciniafa, n. sp. (p. 37) 

 With base of chelicera only sHghtly produced posterolat- 

 erally, caudolateral angle acuminate (figs. 146 and 119) ; 

 ALs and PLs much shorter, less than 67 microns; PLs 

 not extending as far as PPL-i; coxa III virtually as 

 broad as long (fig. 121) 6 



12 Usurped setae are those dorsal setae which arise from the dorsal plate by 

 virtue of its posterior prolongation, i.e., all setae on the scutum except ALs 

 and PLs. 



