118 Journal New York Entomoogical Society. [Voi. xvii. 



Anterior pair of legs almost as long as the body. Femur shorter than tibia. 

 Ungues tridactyle ; dactyles unequal. 



Length, o 42 mm.; breadth, 0.27 mm. 



In moss. Collected by C. A. Hart at Pulaski, 111. 



Pelops bifurcatus, new species. (Plate II, Fig. 3.) 



Reddish brown ; integument smooth and shiny. 



Cephalothorax as broad as long ; lamella; consisting of two long, narrow blades 

 about as long as the cephalothora.x, lying parallel to the median line and ending each 

 in a sharp cusp which extends almost as far as the tip of the rostrum ; translamella a 

 chitinous ridge, incomplete in the middle. There is a small pair of lateral lamelire 

 curved inwards at the tip. Lamellar hairs short, about twice as long as the lamellar 

 cusps, slightly peclmate and curved outwards ; antero-lateral hairs twice as long as 

 lamellar hairs, strongly curved as usual and pectinate on the external edge only. 

 Pseudostigmatic organs clavate, directed forwards and about one half as long as the 

 cephalothorax. 



Abdomen globose ; pteromorpha; truncate anteriorly and not extending beyond 

 the anterior margin of abdomen, anterior free margin of pteromorpliDe slightly con- 

 cave. Rectangular projection present at the front margin of abdomen, extending 

 twice as far in a transverse direction as in the longitudinal direction. From the an- 

 terior margin of the abdomen, on each side just inwards to the pseudostigmatic organs 

 extend forwards two very large, flat setse. The shape of these setre is very character- 

 istic of the species. Their general shape is spatulate but they are deeply bifid in 

 front and have serrate margins. Abdomen otherwise hairless. Genital covers much 

 smaller than the anal covers and situated about one and one half times their length 

 in front of the latter. 



Anterior pair of legs about one and one third times as long as the cephalothorax. 

 Tarsus of leg I slightly longer than the tibia ; tarsus and tibia of leg II subequal in 

 length but the tibia is somewhat thickened at the distal end. Ungues tridactyle ; 

 dactyles unequal. 



Length, 0.38 mm.; breadth, 0.30 mm. 



Under logs. Collected by the writer at Havana, 111. Two speci- 

 mens. 



Genus ORIBATA Latreille. 



Hairs of body never spatulate ; claws tridactyle ; wings of abdo- 

 men never attached to any part of the cephalothorax ; lamellre attached 

 by their inner margin to the dorsal surface of the cephalothorax. 



The species of this genus are by far the most numerous of any of 

 the genera of Oribatidse. 



Key to Species. 



Div. I. Pteromorphee large, extending much beyond the anterior margin of the ab- 

 domen, always capable of being folded down so as to conceal almost com- 

 pletely the legs when the same are flexed. 



Div. II. Pteromorphse truncate anteriorly, not extending beyond the anterior margin 

 of abdomen, and seldom capable of being folded over the flexed legs. 



