NO, 6 CHIGGER SUBGENUS GAHRLIEPIA — TRAUB AND MORROW 47 



reduced; lying against scutum at anterolateral angles. Gnathosoma: 

 Qieliceral bases caudally emarginate and with laterocaudal angles pro- 

 duced, accentuated, Chelicerae about four to five times as long as 

 broad at base; with a distinct apical acuminate cap. Palpal setal 

 formula: B/B(b)/NNN. Palpal claw 3-pronged. Scutum: Long 

 and relatively very broad; about 165 x 169 microns (holotype). Ante- 

 rior margin slightly concave. Broadest at distal two-fifths; virtually 

 covering entire dorsum in unengorged specimens (as fig. 133). Caudal 

 margin broadly and evenly convex. Lateral margins somewhat sinuate 

 to point of maximum width. The punctations of scutum interspersed 

 among irregular rows of circular or subovate scrobiculi, which are 

 about 80 in number and subequal to sensillary bases. With conspicu- 

 ous sclerotized lines or seams connecting bases of ALs with PLs and 

 with first pair of usurped setae. The scrobiculi restricted to that part 

 of the scutum encompassed by these sclerotized lines and by the levels 

 of the usurped setae; evenly scattered within this area; the smaller 

 pits nearer the margins. Region between sutures and true margins of 

 scutum evenly punctate, Intersensillary crater about 14 by 29 microns, 

 AL setae small, not extending beyond posterior margin of crater; 

 thin and weakly pinnatifid ; displaced from anterolateral angles and 

 actually somewhat nearer to midline than are SBs. PL setae sub- 

 marginal, inserted twice as far from SB as are ALs; long, with ap- 

 pressed pinnae, PIV about two and a half times AW. First pair of 

 usurped setae somewhat more lateral than PL but equidistant from 

 margin or slightly farther from margin, as far from PL as is AL; 

 midway between PL and second pair of usurped setae, which usually 

 is in line with PL. Usurped setae morphologically resembling PLs. 

 Sensillary bases surrounded by a triangle of ridges, of which lateral 

 ones are best developed, Sensillae clavate, with head about twice as 

 long as broad. PPW-i is 123 (±7) ; PPIV-2, 119 (±6) ; PPP-i, 

 86 (±5) ; PPP-2, 37 (±7). Body setae: Dorsal setae reduced in 



STANDARD MEASUREMENTS IN MICRONS 



N V cq CQ a, , , c/^ PW PIV PW PIV 



XlD^Si'^a.T. 'ija^Q Coxa II SD ASB Tarsus III 

 Holotype, 



No. B-19389-S 38 104 51 15 150 49 14 55 23 104/73=1-43 0.63 6.9 i04/s3=i.96 



Paratypes (i8): 



Mean 39 loi 51 16 147 46 i4 54 24 1.45 0.63 6.8 1.84 



Range + or— 2 4 3 2 6 4 2 3 3 0.09 0.05 0.06 0.12 



number and size — true dorsals nearly always only 8 in number, but 

 engorged specimens with 4 to 6 additional setae which usually appear 

 marginal but which may actually be dorsal regarding insertion ; true 

 dorsals widely separated from one another; less than half length of 



