42 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



of the head is a single small spine; on the post-lateral portion are 

 two o-roups of small spines, having- two or three spines in each group. 

 The basal joints of the tirst pair of antenna^ bear each a single long 

 spine; the flagellum extends a short distance beyond the middle of 

 the third joint of the peduncle of the second pair of antenna?. The 

 second joint of the peduncle of the second pair of antenna? bears three 

 long spines; the third joint bears four long spines in a longitudinal 



row about the middle of the segment, 

 and a long spine at the distal ex- 

 tremit}^; the fourth joint bears a long 

 spine at the distal extremity; the fifth 

 joint is unarmed; the flagellum con- 

 tains fifteen joints. The joints of the 

 antenna? are thickly fringed with long 

 hairs. 



The tirst segment of the thorax has 

 on the anterior portion two long 

 spines on either side of the median 

 line; on the posterior portion are 

 three long spines on either side of 

 the median line and one small median 

 spine; four small spines are present 

 on the lateral margin on either side. 

 The second thoracic segment bears 

 eight large spines and two small ones 

 on either side of the median line; on 

 the posterior portion is a small median 

 spine; the epimeron of this segment 

 is beset with four small spines. The 

 third segment bears seven long spines 

 and three small ones on either side of 

 the median line, and one long spine 

 on the posterior portion in the median 

 line; the epimeron is beset with four 

 small spines. The fourth segment 

 bears eight long spines and two small 

 ones on either side of the median line, 

 and on the posterior portion in the median line two small spines close 

 together; the epimeron is beset with two spines. The fifth and sixth 

 segments bear each five long spines on either side of the median line; 

 the epimeron of each segment is beset with three spines. The seventh 

 segment bears three spines on either side of the median line; the 

 epimeron is beset with three spines. 



The first and second al)dominal segments have each four spines on 

 either side of the median line. The third segment has three spines on 



Fig. 16. — Arcturus hirsutvs, new spemes 



X2. 



