508 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



teeth on the basal plate of the maxillae of maculosus are long com- 

 pared with a lateral broad one in aniericarvus ; the extra flagellum- 

 like papilla under the posterior lobe on the second thoracic ap- 

 pendages of the male of americanus is missing in maculosus. 



A. versicolor differs from americcunus in that it has respiratory 

 areas like those in maculosus. It has an anterior knob on the an- 

 tennae instead of the anterior hook, and the teeth of the basal plate 

 on the second maxillae are slender. 



o 



Figure 40. — Argulus maculosus: a. Respiratory areas; b, ribs of suction cups; c, male 

 accessory organs of last three legs. 



It differs from maculosus in that the three spines at the base of 

 the antennae are about the same size. The rods in the ribs of the 

 suction cups are composed of a narrow elongate basal and distal 

 oblong segments as compared with a broad basal and rectangular 

 distal segments on maculosus. The teeth on the second maxillae 

 are very slender and widely spaced as compared with the closely 

 spaced ones on nmculosus. The male accessory apparatus is entirely 

 different and characteristic. 



This species has been reported from Ameiurus nehulosus, A. nata- 

 lis, and Amhloplites rupestr^is from Lake Maxinkuckee, Ind. ; and 

 from Ameiurus natalis^ Lost Lake, Ind. Females measure to 10 mm. 

 and males to 7 mm. in length. This species also occurred in a col- 

 lection sent me by Dr. Bangham from Woodmere, Fla., on the chub 

 sucker {EHinyzon sucetta). 



The type specimens for maculosus., U. S. N. M. No. 28937, are 

 typical americanus^ as well as No. 12226. Judged from Wilson's 



