78 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



slight medial swelling, posterior lateral corners smoothly rounded, 

 lateral surface terminating just lateral to beginning of posterior cepha- 

 lothoracic sinuses, at origin of longitudinal legs of cephalothoracic 

 grooves. Posterior sinuses distinct, U-shaped, lateral margin heavily 

 sclerotized, bearing filmy membrane that projects into sinus. Poste- 

 rior margin of median cephalothoracic region with slight concavity 

 medially, lateral margins convex. Major cephalothoracic grooves 

 forming irregular H , posterior longitudinal legs forming line of divi- 

 sion between median and lateral cephalothoracic regions. Cross 

 groove of flattened V-shape, apex pointing anteriorly. Anterior longi- 

 tudinal grooves extending anteriorly and slightly laterally to indis- 

 tinct termination lateral and slightly posterior to ocular region. 

 Ocular region distinct, consisting of 2 heavily pigmented cup-shaped 

 regions, contiguous on median longitudinal axis of body, each with 

 spherical lens. Small, heavily pigmented area present between poste- 

 rior ends of cup-shaped regions and small, heavily sclerotized V-shaped 

 region present at anterior end of eyes, apex of V extending into depres- 

 sion formed by inner anterior margins of cup-shaped pigmented region. 



Female free fourth pedigerous segment short, width more than 

 twice the length. Dorsal surface heavily sclerotized, medial posterior 

 margin of segment distinct dorsally, flatly convex. 



Lateral margins of genital segment (fig. 2Sc) flatly convex, posterior 

 lateral surfaces forming lobate projections extending posteriorly 

 almost to end of second segment of abdomen. Fifth legs originating 

 on posterior ventral surface, just lateral to oviducal opening, at base 

 of lobate projections. Fifth legs dactyhform although sHghtly u-reg- 

 ular, not heavily sclerotized, extending posteriorly past posterior end 

 of lobate projection, bearing 3 plumose setules on dorsal surface in 

 distal third of leg; additional plimiose setule present on ventral sur- 

 face of genital segment, just lateral to leg base. 



Abdomen 2-segmented, distinct from genital segment. First seg- 

 ment approximately four-fifths the length of second, lateral margins 

 flatly convex, posterior margin convex ventraUy, V-shaped dorsaUy, 

 overlapping anterior end of second segment. Lateral margins of 

 second segment flatly convex, posterior margin slightly irregular, 

 tapered to bilobed anal region. Caudal rami laminate, length slightly 

 less than twice the width. Both lateral margins flatly convex, inner 

 lateral surface plumose distally. Outer distal margin indented, 

 bearing single plumose seta; inner two-thirds of distal surface rounded, 

 bearing 4 plumose setae; knobUke projection present on inner distal 

 surface, bearing minute, spikehke terminal process. 



Cephalo thorax of male (fig. 286) generally similar to that of female. 

 Anterior margin of frontal region flatter than in female; V-shaped 

 region of heavy sclerotization at anterior end of ocular region also 



