REVIEW OF GENUS ARGULUS — MEEHEAN 505 



maxillae about normal, basal plate with the two mesial teeth more 

 pointed than lateral broad one; postmaxillary spines blunt and 

 rounded. 



Swimming appendages with flagella. Female with boot-shaped 

 lobe on posterior surface of fourth coxa; tactile papillae long and 

 stout. Second appendage of male with a lobe on the posterior surface 

 of the coxa prolonged laterally almost as long as the basis, a short 

 flagellumlike papilla on the middle posterior surface of the coxa 

 underneath the posterior ventral lobe (fig. 38, d). Third appendage 

 with a club-shaped lobe on the anterior distal edge of the coxa extend- 

 ing over the basis to the exopod ; on the posterior surface of the basis 

 is a flat lobe with the socket opening on its dorsal surface (fig. 38, a). 

 The peg, with an armed ridge around its base, is located on the basis 

 of the fourth appendage; the posterior boot-shaped lobe extends 

 laterally about to the distal end of the basis and is covered entirely 

 by the abdomen. 



From the host Amia calva it has been reported from Ann Arbor, 

 Mich.; Lake Maxinkuckee and Kankakee River, Ind. ; Fairport, 

 Iowa ; from Umbra limi at Fairport, Iowa ; from Amia calva, Ocean 

 Pond, Lake City, Fla. ; and from Esox nohilior, Clayton, N. Y. 



Approximately one-third of the type specimens of americanuSy 

 U.S.N.M. No. 20940, are spotted like maculosus. In the same way 

 many specimens of the latter are unspotted, so that the color is not 

 a specific character. 



ARGULUS VERSICOLOR Wilson 

 FiGUBE 39 



Argulns versieolor Wilson, 1902, p. 716, pi. 20, pi. 26, fig. 83; 1904, p. 643, figs. 

 22-33. 



Carapace only slightly longer than wide, alae overlapping abdomen 

 slightly on the male and just reaching it on the female; cephalic area 

 prominent, lateral sinuses not deep. Abdomen ovate in female, sub- 

 triangular in male; anal sinus very shallow, furcae subterminal and 

 fairly large. Distinctive dark coloring along depressions in alae and 

 posterior of cephalic areas, between dorsal ridges and along intestinal 

 tract through abdomen. Wilson states that these are variegated in 

 natural color. Smaller respiratory area rounded and located in a 

 notch on the mesial side of the larger one (fig. 39, a). Females are 

 reported up to 6 mm., males to 4.5 mm. The hosts and localities are 

 as follows : Esox reticularis, Warren and Worcester, Mass. ; Patapsco 

 Relay, Md. ; Lake Maxinkuckee, Ind.; "pickerel," Valdosta, Ga. 



First antennae with anterior knob, broad ventral spine, and large 

 spine at base; second antennae with broad spine at base; broad post- 



