12 Studies on Arthropoda. 1. 



process. Second tarsal joint (figs. 2 b and 2 d) has along the 

 upper margin (u) three processes increasing in length from the 

 first to the third which is moderately long; the lower margin 

 has only a single moderately short process. 



In second and third pairs of legs the metatarsus is about 

 as long as the tarsus, and first tarsal joint is somewhat longer 

 than the four distal joints combined. Fourth pair of legs (fig. 2 e) 

 have the tibia divided by a single secondary articulation 

 into two sub joints, the first more than three times as long 

 as the second; metatarsus somewhat longer than in the 

 preceding pairs of legs and conspicuously longer than the 

 tarsus. 



Upper surface of cephalothorax in the adult dark yellowish 

 brown, with the deep portions of the impressions dark brown; 

 abdomen above light greyish with a somewhat yellowish tint. 

 Antennae, palps, and femora of the legs nearly as, or a little 

 lighter than, the cephalothorax; the legs without light rings. 



Length of the body of a large specimen y.^ mm, cephalo- 

 thorax 2.8 mm, palp stretched out (claw included) 5 mm, se- 

 cond leg (coxa not included) 8.6 mm. 



Remarks. — The specimens have been found in nests 

 of Tennes (genus and species not noted) ; only a single speci- 

 men has no indication on this topic on the label. 



Occurrence. — Portuguese Guinea (near lat. 12° N.) at 

 two places: Bolama, June — December 1899, i spec; Rio Cas- 

 sine, Jan. — Febr. 1900, i spec, and April 1900, 15 spec. 



B. Sub-order Uropygi. 



This sub-order comprises two tribes, Oxopoei and Tarta- 

 rides, which differ in several important features. No specimen 

 of the Oxopoei was found among the material, but it contains 

 a number of specimens of the Tartarides. 



