274 BEITISH TYROGLYPHID^. 



springs from the underside of each tibia near its distal 

 end. There are two or three short spines on the 

 underside of each tarsus ; and one, rather larger, on 

 the upper side of the second pair. 



Male entirely unlike the female in appearance : 

 irrespective of the extreme difference in size, and the 

 difference of colour before referred to, the legs and 

 abdomen are quite dissimilar. Cephalothorax very 

 like that of the female ; but without the hinder of the 

 two pairs of spines conspicuous in that sex, and having 

 the front pair very small and exactly at the angle of 

 the epistome. Abdomen almost shield or spade-shaped ; 

 the anterior margin straight for the short distance 

 where it adjoins the cephalo thorax, then running out- 

 ward and backward in a double curve on each side. 

 The abdomen is widest at the anterior angle of the 

 lateral margin, and gradually narrows backward ; the 

 hind margin is rounded. There is a low, broad, 

 rounded elevation along the greater part of the median 

 line, with a sulcation round it; otherwise the noto- 

 gaster is flat. The abdomen is less thick in proportion 

 from dorsal to ventral surface than that of the female. 

 Round the edge are six or seven bilateral pairs of very 

 small straight spines; the bifid or tri fid projections ami 

 great curved spines of the female are entirely cibsei/t. 

 There are three or four pairs of small spines on the 

 notogaster similar to those round the edge. Legs 

 short and thick, almost conical, but slightly curved; 

 the two posterior pairs are wholly hidden beneath the 

 abdomen. The femora are somewhat bell-shaped, 

 particularly in the two posterior pairs of legs (the two 

 anterior pairs having an inward curve). The tarsi of 

 the two hind pairs of legs are very loosely articulated 

 on the inner side, with considerable spaces between 

 them and the tibise occupied by flexible membrane. 

 Caroncles broader and shorter than those of the female. 

 There is not any true stern vim nor any epimera to the 

 second, third, or fourth legs, but there is an epimeral 

 piece both above and below the first leg ; which two 



