REVIEW OF GENUS ARGULUS — MEEHEAN 487 



ARGULUS MELANOSTICTUS Wilson 



Figure 27 



Argulus melanostictus Wilson, 1935b, p. 776, pi. 25, figs. 1-4. 



Carapace about as wide as long, extending to third thoracic 

 appendages; cephalic area projecting; eyes large, well separated; 

 dorsal ridges bending sharply laterally ahead of the eyes; posterior 

 sinus wide, sides flaring. Abdomen elliptical, lobes acute, sinus cut 

 past center, tips flaring starting at middle of sinus ; anal f urcae basal. 

 Body flecked with dark color. Kespiratory areas include a rounded 

 one near the suction cups and a posterior, larger somewhat J -shaped 

 one posteriorly (fig. 27, b). Only the female of this species is known, 

 and it reaches 8 mm. in length. It was taken in a tow at Monterey 

 Bay, Calif., and there is a second record from Siam. Host unknown. 



Antennae small, lateral hook short, anterior knob small, ventral 

 median spine of lateral hook broad and blunt, spine at base of first 

 antennae extremely large, that at base of second antennae long, 

 postantennal spine extremely broad and blunt. Suction cups with 

 edge supported by ribs composed of up to 30 or more apparently 

 imbricate plates (fig. 27, a). Second maxillae have the penultimate 

 segment enlarged and armed with spines. Basal plate very broad 

 with short blunt teeth; spines at base of limb near midline on a 

 broad prominence, second pair slenderer and more pointed and some- 

 what inconspicuously located. 



Swimming appendages bearing flagella on anterior two pairs. 

 Fourth pair with small boot-shaped natatory lobe on the coxa. Slight 

 ventral posterior ridge on the coxa of the second and third 

 appendages. Tactile papilla not apparent. 



ARGULUS PUGETTENSIS Dana 



Figure 28 



Argulus pugettensis Dana, 1853, p. 1351, pi. 94, fig. 2a, b. — Thorell, 1865, p. 



60.— Wilson, 1902, p. 711, pi. 15.— Thiele, 1904, p. 32, figs. 77-82. 

 Argulus niger Wilson, 1902, p. 714, pi. 18. 



Carapace of female elliptical, covering appendages and extending 

 onto the abdomen ; cephalic area prominent with lateral sinuses deep. 

 On the male the carapace is more nearly orbicular, covering only the 

 third appendages; eyes small and widely separated. Abdomen of 

 female ovate, lobes rounded, sinus very deep ; on male elliptical, lobes 

 pointed, sinus less than half the depth; anal papillae basal. The 

 respiratory areas are composed of an anterior small rounded portion 

 and a stout J-shaped larger area posteriorly (fig. 28, h). The male 



