NO. 130.. AMERICAN P ARASITIC ARGULW.E- WILSON. 715 



not lar^e but stout, with a swollen terminal joint furnished with 

 a pair of forceps-like hooks; basal plate triangular, teeth broad 

 and blunt. I^Iedian spines between these maxillipeds with papillated 

 plates at their bases. Antenn.x^ medium sized and well armed with 

 wide blunt spines. Swimming legs hardly reaching the edge ot the 

 carapace; lobes on the posterior ones very small. Flagella present; 

 napiU* at the oviduct opening reduced to mere pimples Color 

 of alcoholic specimens a uniform dark brownish black on the dorsal 

 surface, lighter below, with a narrow edge of yellow around the 

 carapace, and vollowish areas around the eyes and brain. 



Both surfaces of the abdomen are brownish yellow covered with 

 small black spots, more numerous on the dorsal than on the ventral 



"'' Leno-th, U mm.; length of carapace, 11 mm.; breadth of carapace 

 9 mm.l length of abdomen, 1 mm.; breadth, 3.25 mm.; breadth of 

 sucking disks, 2.25 mm. Male unknown. tt a t7- i n 



Two specimens, both females, were obtained by the U. b. lish Com- 

 mission steamer Alhatross at Portland, Oregon, October 2, 1889. Name 

 of host not given. No number. 



{7iiger = h\iick.) 



ARGULUS MACULOSUS, new species. 



Plate XIX; Plate XXVI, fig. 82. 

 Carapace orbicular, length about the same as the width; posterior 

 sinus reaching one-third the length of the carapace, wide at the base 

 but posteriorly the lobes approach until they almost touch; antero- 

 lateral sinus well defined. ^ . -i 



Abdomen bluntly triangular, one-third the length ot the rest ot the 

 body, a trifle wider than long; anal sinus l)road triangular, reachmg 

 one-quarter the length of the abdomen; papilla^ lateral, near the tips 

 of the well-rounded lo])es. 



Suckino- disks of medium size, placed rather near together; posterior 

 maxillipeSs small; basal plate rectangular, with three sharp teeth; 

 ventral surface not much roughened. 



Antenme large, the anterior ones without any hook on their front 

 edge- the basal spines large, and the one on the posterior antenna reen- 

 forced by a second as large as itself. These antenna? are widely sepa- 

 rated anteriorly and approach each other posteriorly, so that this heavy 

 armature of basal spines makes a conspicuous V of dark-colored chitin 

 in front of the sucking disks. 



Swimmino- legs reaching beyond the edge of the carapace; lobes on 

 the posterior pair large, boot-shaped, reaching beyond the edge of 

 the abdomen. Flagella present; papilla^ at the opening of the ovi- 

 duct long and narrow. Male about one-quarter smaller than the 

 female, its abdomen of approximately the same shape. Beside the 



