1908] SWING — GENUS ORIBA TA 107 



Abdomen globose. The line between the abdomen and the cephalothorax is 

 almost straight. Anal covers almost semicircular and situated two-thirds their 

 length from the posterior margin of the abdomen. Genital covers rectangular, 

 about one-half as long as the anal covers, and situated about two and one-half 

 times their length from the anal covers. 



Legs stout, subequal in length. The front pair project about one-half their 

 length in front of the tip of the rostrum, while the hind pair do not project beyond 

 the posterior margin of the abdomen. 



Length, 0.46 mm.; breadth, 0.30 mm. 



In moss. Collected by the writer at Areola, 111. Four specimens. 



Oribafa maxima n. sp. 

 (Figs. 8, 9, 10.) 



Rather dark bro^Ti; surface of integument smooth. 



Cephalothorax about one-half as long as abdomen; lamellae a little over one- 

 half as long as cephalothorax, narrow, without cusps, and of about equal width 

 throughout their length; translamella similar to lamella but only about one-half as 

 broad and two-thirds as long as lamella. Lateral lamella a mere ridge. A small 

 pair of tectopedia present. Lamellar hairs long, straight, and pectinate, a little 

 longer than the lamellae from which they extend; interlamellar hairs situated in 

 front of pseudostigmata and near the base of the lamellae. They are equal to the 

 lamellar hairs; anterior lateral hairs two-thirds as long as lamellar hairs, slightly 

 curved and very slightly pectinate, instead of being strongly pectinate, as is usually 

 the case. Pseudostigma short, funnel-shaped, and projecting slightly from the sur- 

 face of the dorso- vertex; pseudostigmatic organ clavate, recurved and about one- 

 half as long as the lamella. 



Abdomen globose; pteromorphae small, triangular, about one-fourth as long 

 as abdomen, truncate in front and not extending beyond the anterior margin of 

 abdomen. Genital covers slightly broader anteriorly than posteriorly, situated one 

 and one-half times their length in front of the larger anal covers. Abdomen hairless. 



Anterior pair of legs about as long as abdomen ; tibia and tarsus subequal ; gen- 

 ual less than one-half as long as tibia; femur three times as long as genual. Femora 

 of legs III and IV somewhat enlarged. Unguis tridactyle, dactyles equal. 



Length, 0.80 mm.; breadth, 0.58 mm. 



Under bark and in moss. Collected by J. D. Hood, Urbana, Illinois. Several 

 specimens. 



