AMERICAN PARASITIC ARG ULID.I>- WILSON. Ill 



and hence very long; the lobes on the posterior pair medium size, 

 boot-shaped, reaching just to the edge of the abdomen. Flagella 

 present; papilla at the oviduct opening of good size and thickset. 



Larger chitin ring in the carapace lobes extending forward opposite 

 the base of the posterior maxillipeds, concave on its inner surface at 

 the anterior end, and into this concavity the other very much smaller 

 ring fits. This leaves the front of the carapace clear, unlike the other 

 species. 



In the male the second legs have a large conical projection on their 

 posterior surface at the outer end of the basal joint. 



There is a similar much smaller one in a corresponding position on 

 the third legs, and these legs also have a rounded knol^ on the anterior 

 surface of the second joint at the end next the body. The regular 

 lo])es on the basal joints of the last legs are longer and more slender 

 than in the female, and are separated from the joint itself at the heel 

 as well as at the toe. 



This is a very clean-looking Argulus, and by far the most beautiful 

 of any American species. It is a veritable Joseph among its brethren 

 in the colors of its coat. The chitin framework and the spines on the 

 ventral surface are a clear orange, the longitudinal ribs of the carapace 

 having the orange bordered by yellow-green. The digestive tube is a 

 deep wine red anteriorly, fading into yellow-green in the abdomen. 



The testes and semen receptacles are a still deeper red, almost 

 purple. The ground color of the body is a yellow-green, this color 

 forming a wide l)order around the edge of the carapace and extending 

 inward diagonally as a wide band on either side from the edge just 

 behind the sucking disks to the base of the posterior sinus. 



From the center of these diagonal bands another narrower band of 

 the same color extends backward parallel with the edge of the cara-' 

 pace to near the posterior border of the lobes. At about their center 

 these last bands are joined with the border along the edge by radial 

 bands. In addition to these bands there are areas of the same color 

 just outside the sucking disks and a large one in either lobe opposite 

 the base of the fii'st swimming legs. 



The rest of the surface is filled in with orange-yellow of various 

 shades, the posterior part of the lobes being tinged with brown, while 

 over the side branches of the stomach it takes more or less of a red- 

 dish hue from the stomach contents. As may well be imagined, the 

 whole presents a beautiful variegated appearance, whence the name 

 given to the species. But the most wonderful thing about these beau- 

 tiful colors is their permanency. They are "fast" colors in the full- 

 est sense of the word, for they defy any preservative so far tried. 

 Chrome-acetic and corrosive-acetic, Perenyi's and platinum chloride 

 have no effect upon them, and after preservation in these solutions 

 they have been kept in alcohol for over a year with so little change of 



