196 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iib 



greatest length of cephalothorax, including frontal region, 0.98 mm.; 

 average of greatest width, excluding marginal flanges, 0.57 mm. 

 Average of greatest length of genital segment 0.28 mm.; average of 

 greatest width 0.27 mm. 



Description.- — ^Body of female and male translucent in alcohol, 

 with small, red pigment spots, some of dendritic shape, in rows on 

 posterior portion of cephalothorax and genital segment, scattered 

 irregularly over rest of body with heaviest concentration in lateral 

 regions of cephalothorax. 



Cephalothorax of holotype female specimen elliptical, frontal 

 region present but reduced to undivided, platelike structure with 

 distinct median depression of anterior margin. Anterior groove 

 dividing cephalothorax and frontal region irregular, indistinct. 

 Anterior margin of frontal region with narrow, membranous flange. 

 Lateral margins of cephalothorax with narrow, membranous flange 

 anteriorly, becoming narrower and finally disappearing posteriorly. 

 Posterior sinuses distinct, U-shaped. Median cephalothoracic region 

 extending posteriorly well past posterior extensions of lateral regions, 

 covering part of fourth thoracic leg-bearing segment. Posterior 

 margin of median extension slightly concave, lateral margins rounded, 

 continuous with inner margins of posterior sinuses. Major cephalo- 

 thoracic grooves present only as pair of longitudinal grooves, cross 

 groove absent. Longitudinal grooves extending from posterior margin 

 of cephalothorax, lateral to posterior sinuses, anteriorly, terminating 

 well back of eyes ; curving medially slightly posterior to middle of 

 cephalothorax. Two lateral strengthening regions visible extending 

 laterally and slightly posterior from middle of longitudinal grooves, 

 in region of medial curve, to region of lateral margins of cephalothorax. 

 Eyes small, placed well anterior, between pair of short longitudinal 

 grooves originating at indistinct groove between cephalothorax and 

 frontal region. Median eye remnant absent (fig. 15a). 



Cephalothorax of allotype male similar to that of female. Frontal 

 region present though indistinct groove separating region from 

 cephalothorax in female absent in male. Lateral margins of cephalo- 

 thorax with membranous flange continuous .to beginning of posterior 

 sinuses. Posterior margin of protruding median cephalothoracic 

 region more concave than in female. Cross groove present though 

 indistinct, connecting medially curved regions of longitudinal grooves 

 (fig. 156). 



Fourth thoracic leg-bearing segment of holotype female specimen 

 small, almost completely covered dorsally by median extension of 

 thoracic region. Division between fourth thoracic leg-bearing seg- 

 ment and genital segment indistinct, segments at least partially fused. 



