Palaeozoic Arachnida of Xorth America. 



129 



the cephalothorax forms a long, pointed process. The eyes are 

 very small, almost four times their diameter apart. The six an- 

 terior tergites have a rather peculiar shape, being strongly pro- 

 curved, very short in the middle and much longer at the sides. 

 Their posterior edge is heavily thickened. The lobe of the cephalo- 

 thorax extends as far as the anterior edge of the second tergite. 

 The demarcation lines between the last four tergites are light, but 



Fig. Si. Fig. S2. 



Figure Si.—Architarbus minor n. sp., holotype, Peabody Mus. No. tSg, 

 dorsal view of cephalothorax and abdomen. Figure 82. — Same, ventral 

 surface. X ^ 



clear. Anal opercle appears on both surfaces. The abdominal 

 sternites very much like those in the preceding species, but the 

 converging lines divide the last sternite also. Instead of a trans- 

 verse groove, a triangular depression in the first sternite. Sternum 

 typical. The coxae of the first pair of legs with a very pronounced 

 apical process. Pedipalpi small, pediform, only three terminal 

 joints visible. Trochanters one-jointed. Of the legs the left third 

 is alone preserved. The patella of this leg is longer than the femur. 

 The tarsus is apparently one-jointed. 



Abdomen and legs punctate above and below. The greater part 

 of the cephalothorax smooth, but a punctate area occupies the 

 space between the eyes, extending backward to the middle of the 

 cephalothorax and reaching anteriorly its end. 



Trans. Conn. Acad., Vol. XVIII. 9 June, 1913. 



