4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



distinct, beginning on posterior margin then diverging slightl-y, the 

 somewhat longer of the two 0.33 mm. long. Cephahc plate without 

 lateral margins. 



Clypeus : Deep yellow, sparsely clothed with longer setae. Anterior 

 apex weakly developed. Lateral paraclypeal sutures short, anteriorly 

 incomplete, generally vague. 



Labrum: Well separated medially from posterior clypeal margin. 

 Median tooth deeply pigmented, robust, evenly pointed, flanked by 

 heavily sclerotized, deeply pigmented rounded inner shoulders of 

 labral sidepieces. True posterior margins of sidepieces membranous, 

 delicately fimbriulate; beneath (i.e., dorsal to) each the darker heavier 

 portions of each sidepiece are visible. Each sidepiece broadly meet- 

 ing inner end of its coclypeus. Anterolateral corner of each sidepiece 

 with a minute sHtlike opening (of a labral gland?); each sidepiece 

 with a field of microscopic sensory points, each resembling a typical 

 sensillum basiconicum. Anteriorly across entire labrum one weU- 

 defined complete and several abortive sclerotic wrinkles (rugae). 



First maxillae: Each coxosternum with a weak longitudinal suture 

 (actually a thin membranous strip). 



Second maxillae: Second article with the usual weak dorsodistal 

 spur. Claw long, acuminate, its dorsal edge pectinate, its ventral 

 edge straight, undissected. Dorsal brush dense, beginning at about 

 middle of third article. 



Mandible: As shown in figure 1 (see also note 5, p. 14). 



Prehensorial segment : Prosternum: Setae sparse, the majority rela- 

 tively long; surface impressed with numerous microscopic pits each 

 with a sensory point (i.e., each resembling a sensillum basiconicum) ; 

 ventrally without chitin-lines, dorsally with a pair of short abortive 

 and sinuous chitin-hnes (see note 6, p. 14); pleuroprosternal sutures 

 distinct, complete; anterior margin unarmed, without plates or raised 

 sclerotized border, the two sides apparently (but not actually) sepa- 

 rated by a midiongitudinal short membranous strip. Prehensors: All 

 articles with numerous sensOla basiconica; none with spinous proc- 

 esses, denticles, or other armature; poison calyx within the trochan- 

 teropref emur, elongate, thick ; tarsungula of normal size and configura- 

 tion (as in Kethops, see figs. 8 and 9), evenly curved from base to tip; 

 poison canal aperture dorsal, very long and narrow, its greatest length 

 to width=5: 1, 



Tergites: First pedal tergite yellowish, with a few larger setae; with 

 a distinct cervical suture to which are attached omegoid (i.e., W- 

 shaped) sutures, their posterior apices continuous with prominent 

 paramedian sutures. Tergites 2-22 whitish and translucent, the pos- 

 terior border very pale yellowish, the underlying musculature plainly 

 visible, very sparsely clothed with minute setae; each impressed 



