416 BULLETIN" 15 8, UNITED STATES NATIOISTAL MUSEUM 



Abdomen cylindrical, 2-segmented, terminal segment twice as long 

 as basal, with a knob armed with spines on its dorsal surface near the 

 center of the segment. Caudal rami filiform, without setae ; branches 

 of f urea bifid ; fourth leg 4-segmented with five stout spines and no 

 seta. Total length, 10-12 mm. 



Mole. — Carapace one-fifth longer than wide and rather depressed, 

 a fringe of hairs along the lateral margins and around the posterior 

 lobes even longer than in the female ; four small spines on either half 

 of the median lobe. Dorsal wings of the fourth segment considerably 

 wider than the genital segment and turned forward at their outer 

 corners, with a narrow posterior median sinus. Each wing has a row 

 of four small spines on its dorsal surface along the posterior margin. 

 Genital segment orbicular, as wide as long, with a single spine on the 

 dorsal surface on either side of the midline near the center of the 

 segment, and an irregular row of eight spines along the posterior 

 margin, also on the dorsal surface. There are no posterior lobes, but 

 the spiny processes are attached directly to the segment itself; each 

 is slender, extends backward parallel with the abdomen, and reaches 

 beyond the tip of the latter, with three minute apical spines. Abdo- 

 men 2-segmented, the terminal segment twice the length of the basal, 

 both segments with straight sides and armed dorsally with a few 

 small spines. Caudal rami as long as the entire abdomen, strongly 

 flattened laterally, closely appressed, each with a single apical seta. 



The second antenna carries a stout spine on the inner margin of 

 the terminal claw and a second larger one on the ventral surface 

 near the base of the claAV. The inner setae of the end segment of 

 the first legs are exceptionally stout and extend inward to the base 

 of the proximal segment. The second endopod segment of the sec- 

 ond legs is as wide as long, with a large rounded flap on its outer 

 margin. Total length, 8 mm., including caudal rami. 



Remarks. — The male is here described for the first time and com- 

 pletes the establishment of the species. The new host, the spearfish 

 {Tetraf turns imperator), is a southern form and is only captured 

 occasionally in the present area. 



Genus ELYTROPHORA Gerstaecker, 1853 



First three thoracic segments fused with the head ; carapace flatly 

 arched, as wide as long, with short and broadly rounded posterior 

 lobes; fourth segment with a pair of small dorsal plates slightly 

 overlapping the genital segment, fused at their base. Genital seg- 

 ment of medium size, longer than wide, with broad lobes at the 

 posterior corners. Abdomen 2-segmented; caudal rami laminate, 

 with setae ; first four pairs of legs biramose, rami of first pair 2-seg- 



