110 PROCEEDINGS OF THE NATIONAL MUSEUM v( 



Measurements. — (In mm) 11 females and 3 males: 



female male 



mea'i 

 Total length, excluding caudal setae 

 Length of cephalothorax, including frontal 



region 

 Width of cephalothorax 

 Length of genital segment 

 Width of genital segment 

 Length of abdomen 

 Length of caudal rami 

 Length of egg strings (4 strings) 



Description. — Female cephalothorax (fig. 40a) ovoid, consisting 

 of cephalon and first 4 thoracic segments. Frontal region slightly 

 more than one-tenth the length of cephalothorax, with membrane 

 along most of anterior margin. Lunules extending posteriorly, on 

 ventral surface, past j miction of frontal region and rest of cepha- 

 lothorax. Lateral margin of cephalothorax slightly uTegular, with 

 numerous small indentations, bearing narrow membrane extending 

 laterally and second, frilled membrane extending medially, on ventral 

 surface. Posterior lateral cephalothoracic surface with small, pocket- 

 like depression on dorsal surface. Posterior sinus (fig. 40c) UTegu- 

 larly V-shaped, with fine membrane along outer surface. Posterior 

 margin of median cephalothoracic area irregularly convex, area 

 extendmg posteriorly slightly past lateral areas, with 3 pairs of minute, 

 hairlike processes on median-posterior dorsal surface. Major dorsal 

 cephalothoracic grooves forming irregular H ; dorsal surface with 

 scattered minute, hairlike processes, in addition to those on posterior 

 median surface. Ocular region distinct, in anterior thkd of cepha- 

 lothorax, pigmented cups contiguous on median longitudinal axis 

 of body. 



Female free fourth pedigerous segment broadest medially, angled 

 toward anterior and posterior ends. Segment distinct from cepha- 

 lothorax, distinctly separable from genital segment ventrally, in- 

 distinctly separable dorsally. Genital segment (fig. 40c^) variable in 

 shape, subovoid to rectangular, anterior lateral and lateral posterior 

 surfaces frequently slightly lobate. Fifth leg (fig. 40/) situated on 

 lateral ventral surface in posterior fourth of segment, consisting of 

 2 nodules, outermost with single lightly plumose setule, innermost 

 with 2 lightlj^ plumose setules. 



Abdomen elongate, consisting of 1 or more segments, distinct from 

 genital segment. Anterior end of abdomen narrower ventrally 

 than dorsally. Lateral surfaces irregular, with several distinct 

 constrictions in some specimens, constrictions absent in others. Ab- 

 domen narrower posteriorly than anteriorly, posterior region (ap- 



