38 T. V. HODGSON. 



Antarcturus franklini. 



(Plate v., figs. 2 and 3.) 



Arcturiis franklini Hodfison (8), pp. 250-1. 



Specific characters : — 



A small spine nt the antc-ro-liiteral antrle of the cephalosoine. 



Two prominent dorso-lateral spines on each of the first three segments of the mesosome ; 

 cpiraeral spines as well. No dorso-lateral spines in the male. 



Urosome rounded, covered with small s]iines, with two slightly divergent terminal sjnirs. 



The original description being quite unsatisfactory, and us I have now more 

 material, I will take this opportunity to redescribe the species. 



The body is usually covered with small, irregular chromatophores, which are most 

 definitely arborescent on the cephalosonie, which is smooth ; its anterior margin is 

 incurved, and just behind the lateral angle is a stout spine. Two strongly developed 

 and pointed horns lie behind the anterior margin and between the eyes. 



The three anterior segments of the mesosome are almost smooth, the fourth being 

 covered with small spines ; the first three carry a pair of very prominent spines dorso- 

 laterally. The epimera of all four bear a stout spine, and there are also other smaller 

 accessory ones, but these vary. The fourth segment is devoid of the prominent dorso- 

 lateral spine.s. There is no great difference in the length of these segments, the first 

 two are very nearly, if not quite, subequal, and the two following also, but these are 

 a little longer. The three posterior segments are covered laterally with small spines, 

 a band of them crosses each segment, forming a more or less prominent posterior 

 fringe. 



The metasome is also covered with small spines ; although all the segments arc 

 rigidly united, the two anterior ones are distinct, the third is fused with the urosome ; 

 there are no conspicuous spines here other than the two prominent ones which 

 terminate the l)ody ; one pair, however, is a little larger than the remainder. 



The first antenna is of the normal type ; the'first j(nnt is short and stout, with its 

 inner margin considerably expanded as a wing-like enlargement, the second joint is 

 but little shorter and spindle-like, the third is but the merest trifle shorter still, and 

 the fourth is scarcely as long as the two preceding ones together, and has nine groups 

 of sensory setaj. 



The second antenna is longer than the Ijody ; the first joint is very small and 

 scarcely noticeable from the dorsum, the second is longer and its distal border forms 

 two .spikes', one each .side. The proportions of the remaining joints and flagollum are 

 as 5'5. 14o. 19. 15. The third joint has four or more prominent s{)ines near its outer 

 border, the following joint al.so has a series. l)Ut they are smaller and diminish to 

 nothin" along the joint, which is also covered, but not very plentifully, with small 



