NO. 6 CHIGGER SUBGENUS GAHRLIEPIA — TRAUB AND MORROW "JJ 



16(12) With 4 to 5 setae on coxa III (fig. 178). 



saduski Womersley, 1952 (p. 62) 



With I or 2 setae on coxa III I7 



17(16) With 2 setae on coxa III; anterior portion of lateral mar- 

 gins of scutum markedly sinuate (figs. 186, 187) 18 



With only i seta on coxa III ; anterior portion of lateral 

 margins of scutum evenly curved or mildly sinuate (figs. 



5, 188) 19 



18(17) With 6 usurped setae on scutum, including a submedian pair 



(fig. iS6) ...pliili pi (Jadin and Vercammen-Grandjean, 1952) (p. 67) 

 With only 4 usurped setae, all submarginal (fig. 187). 



lazvrencei Jadin and Vercammen-Grandjean, 1952 (p. 67) 



19(17) With only 4 usurped setae on scutum 20 



With 6 or more usurped setae 25 



20(19) PSB greater than 160 microns; ratio — — approximately 



0.42 cctrata Gater, 1932 (p. 59) 



PSB less than 131 microns; ratio -^^ usually greater than 



0.50 • 21 



21(20) PL over 60 microns; ventral palpal tibial seta definitely 



barbed (fig. 4) 22 



PL less than 45 microns; ventral palpal tibial seta nude 



or at most frayed (fig. 168) 23 



22(21) ALs less than 48 microns in length; scutum with 2 types of 

 punctaei3 (i.e., with pits the size of setal bases in addi- 

 tion to micropunctae) (fig. 15) ; PLs much closer to ALs 



than to PPL-i fimbriata, n. sp. (p. 10) 



ALs more than 62 microns in length; scutum with only 

 micropunctae (fig. 5) ; PLs midway between ALs and 



PPL-i cxilis, n. sp. (p. 6) 



23(21) All four usurped setae marginal (fig. 153) ; palpal formula 

 N/N/NNN; PSB less than 95 microns. 



nanus (Oudemans, 1910) (p. 52) 

 With at least one pair of usurped setae submedian or sub- 

 marginal; with at least palpal femoral and/or genual 



bristle somewhat barbed ; PSB more than 105 microns 24 



24(23) Posterior margin of scutum subtruncate (fig. 45) ; with 

 fewer than 34 dorsal setae (fig. 43) ; coxa III only 



slightly longer than broad (ratio 1.15) elbcli, n. sp. (p. 18) 



Posterior margin of scutum evenly but shallowly convex 

 (fig- 53) ; with more than 40 dorsal setae (fig. 51) ; coxa 



III more than 1.5 times as long as broad tylana}^ n. sp. (p. 21) 



25(19) With 10 or more usurped setae on scutum 26 



With 6 to 9 usurped setae 28 



13 This character is best seen in freshly mounted specimens or when examined 

 under oil. 



1* G. tylana has from 4 to 9 usurped setae (usually 6) and hence appears 

 again farther down in the key. 



