548 



PROCEEDINGS OF THE NATION A :. MUSEUM. 



VOi,. XXIII. 



ii6. ARCTURUS FLORIDANUS Richardson. 



Arcturuit florldanua Richardson, Am. Kat., XXXIV, 1900, j). 2.")0. 



Head with deep anterior excavation, on each side of which the lateral 

 margins arc produced, bearing each a single spine at the outer angle. 

 On the anterior portion of the head are two long spines situated 

 ])etween the eyes. Two long spines are placed on the posterior por- 

 tion of the head, between the lino of the eyes, on either side of which 

 are two small spines, one near each eye and one on the lateral margin. 

 The first pair of antennas are short, reaching onl}' half the length of 



the third joint of the second pair 

 / of antennie. The first joint of 



the second pair of antenna' is short 

 and unarnu'd; the second joint 

 has one short spine at the base 

 and three long ones at the upper 

 end; the third joint is nearl}^ three 

 times as long as the second' joint 

 and has two long spines at tiie 

 upper end; the fourth joint is 

 armed with a single spine; the 

 fifth joint is unarmed; the liagel- 

 lum is nine-jointed. 



The first thoracic segment has 

 two dorsal spines on the anterior 

 part, one on either side of the 

 median line, six spines on the pos- 

 terior part, three on either side 

 of the median line, and two lat- 

 eral spines; the second thoracic 

 segment has three spines on the 

 anterior portion, one on the me- 

 dian line and one on either side 

 of it, four spines on the poste- 

 rior portion, two on either side of the median line, and three lateral 

 spines; the third thoracic segment has two spines on the anterior 

 portion, one on either side of the median line, four spines on the pos- 

 terior portion, two on either side of the median line, and four lateral 

 spines; the fourth segment has two spines on the anterior part, one 

 on either side of the median line, four spines on the posterior part, 

 two on either side of the median line, and four lateral spines; the 

 fifth segment has two spines widely separated, one on either side of 

 the median line, and one lateral spine; the sixth and seventh segments 

 have six spines, three on either side of the median line, and one lateral 

 spine. 



The first three abdominal segments have each eight small spines, 



Fig. 25. — Arctukus fj.oridanus. 



