76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 28 



6(5) Scutum ovate and evenly convex (fig. 145) ; scutum very 



long, PSB more than 64 times AW granulata, n. sp. (p. 50) 



Scutum somewhat constricted at anterior fourth (fig. 118) ; 



PSB only about 5 times AW tuber culata, n. sp. (p. 40) 



7(4) Marginal scrobiculi on scutum relatively large, size of each 

 equal to about one-fourth to one-third width of scutum 



(fig. 174) 8 



Marginal scrobiculi on scutum much smaller, only about 



size of sensillary bases 9 



8(7) PLs displaced anterior ward, so that bases of PLs are ante- 

 rior to line of SB (fig. 174) ; marginal scrobiculi scal- 

 loped, pointing inward, and more than 8 times diameter 



of median pits ornata Womersley, 1952 (p. 63) 



PLs well beyond line of SB (fig. 184) ; marginal scrobiculi 

 only about 2 or 3 times diameter of median ones. 



insigne Womersley, 1952 (p. 66) 

 9(7) With 4 usurped setae on scutum; PLs at least i^ times 



length of ALs (fig. 102) 10 



With 8 or more usurped setae on scutum ; PLs scarcely 



longer than ALs (fig. 94) 11 



10(9) Scutum with a central core of small trigonal scrobiculi (fig. 

 102, C.C.) ; submarginal scrobiculi definitely larger than 

 those of core; coxa III slightly broader than long (fig. 



loi ) tessellata, n. sp. (p. 34) 



Scutimi lacking a central core ; median scrobiculi similar 

 to others on scutum (fig. 182) ; coxa III somewhat longer 



than broad decora Womersley, 1952 (p. 64) 



1 1 (9) With 8 usurped setae on scutum (fig. 94) picta, n, sp. (p. 31 ) 



With 17 to 20 usurped setae on scutum (fig. 86) evansi, n. sp. (p. 30) 



12(1) Posterolateral setae (PLs) moved far anteriorward, adja- 

 cent to anterolaterals (ALs) so that there appear to be 

 two pairs of ALs (fig. 61) ; PLs separated from ALs 

 by a distance not greater than the diameter of sensillae 



bases 13 



Posterolateral setae separated from ALs by a distance at 



least thrice the diameter of sensillae bases (fig. 5) 16 



13(12) With 8 or 10 usurped setae on the scutum (fig. 172) ; 

 scutum caudally angled ; with all palpal tibial setae nude 



(figs. 170, 171) hirsuta (Radford, 1946) (p. 61) 



With 4 or 6 usurped setae on the scutum (figs. 70 and 78) ; 

 scutum caudally rounded; with at least one barbed seta 



on palpal tibia (fig. 63) 14 



14(13) With 6 usurped setae; first pair of usurped setae (PPL-i) 



submarginal (fig. 78) pliirisetae, n. sp. (p. 28) 



With 4 usurped setae; PPL-i not necessarily marginal in 



position 15 



15(14) Usurped setae all submedian (fig. 70); PSB: SB ratio = 



3:1 dupliseta, n. sp. (p. 26) 



Usurped setae marginal (fig. 61); PSB: SB ratio = 2:1. 



gemhta, n. sp. (p. 23) 



