Tertiary Spiders and OpUionids. 275 



species, although no detail is discernihle. The third and fourth 

 right trochanters show a notch at their distal ends. Body and 

 legs are thickly clothed with simple brown hair. A few spines can 

 be seen on the legs and palpi, but their arrangement cannot be 

 determined. Measurements of legs : — First leg, femur — 2.8 mm., 

 tibia with patella — 3.6 mm. ; Second leg. femur 3.0 mm., tibia with 

 patella — 3.3 mm. ; Third leg, femur — 2.8 mm., tibia with patella — 

 2.8 mm., metatarsus with tarsus — 3.2 mm., total — 8.8 mm. ; Fourth 

 leg, femur — 3.0 mm., tibia with patella — 3.7 mm., metatarsus with 

 tarsus — 4.0 mm., total — 10.7 mm. From these measurements it 

 would appear that the fourth leg is in all probability the longest. 

 The femora are heavy, those of the first and second pair apprecia- 

 bly distended in the middle. The pedipalpi are slender, 3.0 mm. 

 long. No claws can be seen, nor can anything more be exposed. 



ORDER OPILIONES. 



Characters of the order: — Abdomen segmented, broadly joined 

 to the cephalothorax. Chelicerse three-jointed, chelate. Pedi- 

 palpi not chelate. Coxse of pedipalpi and of the first and second 

 pair of legs with maxillary lobes (gnathobases). Tarsi of varia- 

 ble number of joints. Eyes two. Respiration by means of 

 tracheal tubes with one pair (sometimes with two pairs) of 

 stigmata. 



The separation of the order into suli-orders is based on the 

 relative position of the coxse. 



Genus Phalangiuui Linnaeus. 



This genus belongs to the sub-order Plagiostethi of Simon, or 

 Palpatores of Thorell. Nevertheless I am using it here in an 

 indeterminate sense, merely as representative of the order or at 

 best of the sub-order. 



Phalangium oculatum n. sp. {Text figure j/). 



One specimen. No. 9494 (now No. 121) in the Scudder Col- 

 lection of the ]\luseum of Comparative Zoology of Harvard 

 University. 



Total length — 3.8 mm. Abdomen 2.4 mm. wide, with a darker 

 band in the middle and two short, pointed spines near the poste- 



