GHILIANELLA ASSASSIN BUGS — MALDONADO-CAPRILES 403 



18(2) Eighth and ninth terga each with a prominent median longitudinal 



ridge; seventh sternum at least one and one-half times as long as 

 sixth on median line, the latter with a very deep median concavity 



on hind margin (figs. 62, 106, 134) aracataca 



With a different set of characters 19 



19(18) Seventh tergum with posterior angles produced as divergent acute 



processes; other terga ornamented on their hind margins with a 

 pair of spots of golden pubescense; abdomen boat shaped (fig. 118). 



assanulrix 

 Posterior angles of seventh tergum not so produced; abdomen not so 



ornamented 20 



20(19) Sixth tergum witli a prominent median elevation or tubercle on 



hind margin 21 



Sixth tergum with or without a wartlike median elevation on hind 



margin 23 



21 (20) Elevation of sixth tergum very large and broad, hoodlike, with a small 



wartlike projection on its apical margin (fig. 56) . . . calymmata 



Elevation of sixth tergum smaller, conical 22 



22(21) Ninth tergum with a long, broad, median ridge (fig. 120). 



panamana 

 Ninth tergum with a short, narrow median ridge (fig. 126) . . obesa 

 23(20) Seventh sternum distinctly produced at middle of hind margin . 24 



Seventh sternum not produced at middle of hind margin .... 25 

 24(23) Seventh tergum much longer than wide; middle of hind margin con- 



spicuously declivate, the lateral angles prominent acute; genital 



segments as in figure 119 stipitata 



Seventh tergum little longer than wide, hind margin not declivate 

 medianly, almost straight across, the lateral angles and median 



point very slightly produced similata 



25(23) Abdomen clavate: eighth tergum semicircular: ninth tergum truncate 



cuneate filiventris 



Abdomen parallel sided; eighth tergum hexagonal; ninth tergum with 



apex truncate (fig. 128) atabapo 



26(1) Posterior angles of at least four terga more or less ampliate or produced, 



the outline of dorsum of abdomen on dorsal aspect not a continuous 



straight or curved line (fig. 89) 27 



Posterior angles of terga, except sometimes fifth, sixth, or seventh, 

 not produced, the outline or dorsum of abdomen a continuous 



straight or curved line 35 



27(26) Forcfemur notably thicker near base than at first strong spine (fig. 



74) 28 



Forefemur enlarging gradually from base to first strong spine . . 30 



28(27) A strong tubercle on hind margin of sixth tergum 29 



No obvious tubercle on hind margin of sixth tergum (fig. 54). 



plabrata 



29(28) Eighth tergum with disk prominently elevated each side of a broad 



median sulcus; ninth tergum convex medianly, the margin elevated, 



very slightly corrugate insidiatrix 



Eighth and ninth terga with disk depressed and margins elevated, 

 each longitudinally carinate and transversely corrugate (fig. 112). 



amicula 



