404 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



30(27) Seventh tergum narrower basally than apically, posterolateral angles 



sharply produced, with a long spinelike median projection (fig. 89). 



spinicaudata 



Seventh tergum differently shaped and without median long spine . 31 



31(30) Angulations of terga less pronounced; apex of sixth tergum scarcely 



wider than that of seventh 32 



Angulations of terga more pronounced; apex of sixth tergum notably 



wider than that of seventh 33 



32(31) A strong tubercle on hind margin of sixth tergum; head and thorax 



strongly granulate; length over 21 mm peruviana 



Hind margin of sixth tergum without a tubercle; head and thorax not 



granulate; length under 15 mm calva 



33(31) Eighth tergum pentagonal; ninth tergum with lateral margins raised 



from middle and curving mesad on apex, with a median subcircular 



elevation near apex (fig. 123) haitiana 



Eighth tergum broadly elliptical; ninth tergum different, with a 



median low ridge 34 



34(33) Elevated margins of ninth tergum produced apically as distinct spines 



(fig. 142) annectens 



Elevated margins of ninth tergum not forming spines . . truncala 



35(26) Basal spine of forefemur at less than its own length from base of 



femur; foretibia and tarsus combined three fourths as long as femur; 



interantennal spine a mere wart, abdomen racket shaped (figs. 



55, 115) galapagensis 



Basal spine of forefemur at slightly or distinctly more than its own 



length from base of femur; other characters not as above ... 36 



36(35) Seventh sternum distinctly or slightly produced on middle of hind 



margin 37 



Seventh sternum not produced medianly 48 



37(36) Hind margin of seventh tergum not tuberculate 38 



Hind margin of seventh tergum more or less tuberculate .... 40 

 38(37) Hind margin of seventh tergum concave medianly; seventh sternum 



roundly produced medianly (fig. 8) personata 



Hind margin of seventh tergum not concave medianly 39 



39(38) Seventh tergum triangularly produced on hind margin; head and 



thorax copiously granulate; eighth tergum short and broad (fig. 



116) alterata 



Hind margin of seventh tergum straight; head and thorax sparsely 



granulate; eighth tergum semicircular semipallida 



40(37) Median tubercle on hind margin of seventh tergum extending farther 



posteriorly than lateral angles; ninth tergum with three fingerlike 



ridges at apex persimilis 



Median tubercle on hind margin of seventh tergum not extending 

 as far posteriorly as lateral angles, if extending apex of ninth 



tergum without fingerlike longitudinal ridges 41 



41(40) Apex of ninth tergum distinctly upcurved 42 



Apex of ninth tergum not upcurved 43 



42(41) Apex of ninth tergum emarginate medianly; projection of seventh 



sternum rectangular, longer than its basal width (figs. 61, 90). 



nionense 



Apex of ninth tergum straight; projection of seventh sternum rounded 



(fig. 132) productilis 



