402 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



4(3) Fifth tergum the widest, sides before hind margin prominently ele- 

 vated usually standing above connexivum. . 5 



Sixth tergum about as wide as or wider than fifth, bearing a large 



median tubercle 17 



5(4) Sixth tergum with a prominent median falcate tubercle on its hind 



margin (fig. 97) bethei 



Sixth tergum without large median tubercle, though fifth or sixth 



may be more or less elevated at middle of hind margin. ... 6 



6(5) Fifth tergum with a pair of divergent, long conical horns, each nearly 



equal in length to width of tergum mirabilis 



Fifth tergum without such horns 7 



7(6) With long spines, one on each side, on: head behind eyes, middle of 

 prothorax, mesothorax, and metathorax; other long spines on ab- 

 domen (fig. 69) spinata 



Without such spines 8 



8(7) Elevations of fifth tergum distinctly inside lateral margin of disk. 9 



Elevations of fifth tergum on lateral margins of disk 10 



9(8) Seventh tergum broader than long (fig. 107) clavellata 



Seventh tergum longer than broad (fig. 99) approximata 



10(8) Abdomen with one or more pairs of large pale pilose spots on dorsum 



and venter 11 



Abdomen without such pale pilose spots 12 



11(10) Yellow spots extensive; with spots on sixth segment signata 



Yellow spots small; without spots on sixth segment grapta 



12(10) Eighth tergum much shorter than wide 13 



Eighth tergum as long as or longer than wide 15 



13(12) Posterior angles of seventh tergum produced distinctly beyond middle 



of hind margin which is merely convex and not at all tuberculate; 

 ninth tergum with lateral and shorter median ridges (figs. 109, 125). 



subglobulata 

 Posterior angles of seventh tergum produced no farther than median 



convexity of hind margin 14 



14(13) Hing margin of seventh tergum tuberculate; eighth nearly semicir- 



cular; ninth tergum with lateral margin elevated apically and with 



long median ridge (figs. 98, 136) globulata 



Hind margin of seventh tergum not tuberculate; eighth trapezoidal; 

 median elevation of ninth anchor shaped, the arms passing under 



lateral elevations (fig. 127) puncticauda 



15(12) Posterior lateral angles of seventh tergum distinctly produced beyond 



middle of hind margin which is not tuberculate (figs. 96, 137). 



gladiator 



Posterior lateral angles of seventh tergum produced no farther than 



median convexity of hind margin which is slightly tuberculate. 16 



16(15) Seventh sternum about twice as long on median line as sixth, with a 



broad convex process apically which is slightly emarginate medianly. 



perigynium 

 Seventh sternum only a third longer than sixth, somewhat angulate 



apically recondita 



17(4) Fifth tergum about equal in length to its width at hind margin (fig. 



49) pendula 



Fifth tergum about twice as long as its width at hind margin (fig. 57). 



cuneata 



