ORIBATOIDEA SINENSIS I 



127 



Galumna sinuofrons sp.n. 



Diagnosis. — Body small, .43 mm. long, fairly high, tan 

 to brown, semitranslucent ; frons vertical and with a broad 

 median undulation; pseudostigmatic organs medium long, 

 somewhat rigid, with very slender shaft and a very much 

 wider, prominent head; interlamellar hairs fairly long; 

 cephalothoracic bristle formula: pst. o. 1, il.h. 2, l.h. 4, 

 r.h. 3; anterior edge of notogaster distinct; pteromorphal 

 groove narrow, the pore anterior to it inconspicuous; ptero- 

 morphal nervures few, short, crenelate. 



Dimensions. — (Twelve specimens measured). 



Total length of body ... 



Length of notogastral plate ... 



Breadth of notogastral plate ... 



Length of pteromorphae 



Distance between interlamellar hairs 



Length of ventral plate along median line 



Length of camerostome 



Breadth of camerostome 



Anterior edge of genital cover to posterior 



edge of ventral plate 

 Length of genital aperture ... 

 Breadth of genital aperture ... 

 Posterior edge of genital aperture 



anterior edge of anal aperture ... 

 Length of anal aperture 

 Breadth of bnal aperture 



... 406 



(429; 



... 320 



(355) 



... 275 



(293) 



... 229 



(241) 



... 65 



( 74) 



... 303 



(327) 



... 66 



( 78) 



... 85 



( 87) 



or 



... 252 



(262) 



47 



( 54) 



... 62 



( 63) 



to 





... 86 



( 92) 



... 75 



( 80) 



... 85 



( 88) 



447 



379 



291 



262 



82 



344 



84 



90 



279 

 61 

 70 



98 

 86 

 94 



Color. — This species varies (in balsam mounts) from 

 tan to reddish brown and is from semitranslucent to some- 

 what opaque. The thinner or smaller parts are necessarily 

 lighter. 



Form. — The general shape of the body is broadly ovate 

 from above, slightly depressed, as viewed from the side, 

 though dorsal outline is arched, and with relatively flat 

 venter. 



Cephalothorax (figs. 10, 11 and 13) unusually short and 

 broad ; frons sloping with unusual abruptness down to the 

 rostrum, with a wide, shallow, median concavity giving the 

 frons a sinuous outline from above (whence the specific 

 name) ; rostrum small, projecting as a small, flat cone from 

 this groove; rostral hairs moderately long, stiff; lamellar 

 hairs slightly shorter than rostral hairs, on the anterior-most 

 curve of lamellae; interlamellar hairs rough, fairly long, 

 curved upwards near their middle, located just posterior to 



