NO. 1302. AMERICAN PARASITIC ARG ULIDyl^WILSON. 729 



Color. — Yellowish horn-color, with spots of brown pigment thickly 

 scattered over the dorsal and ventral surfaces; spines and hooks 

 brown. 



Length, 8 mm.; length of carapace, tt.Smm. ; l)readth of carapace, 

 5 mm. ; length of al>domen, 3 mm. ; breadth, 2 mm. Female unknown. 



ILih'itat. — From Tubingen, on a species of dace or minnow, Phoxinus 

 /lev is. 



{^yhoxmifs— generic name of host.) 



Genus CHONOPELTIS Thiele. 



This genus diHers from both Argulus and Dolops in the complete 

 suppression of the first antenna?. The simple second antenna?, are 

 present, and are similar in all respects to those on the other two 

 genera. This takes away entirel}" from the antenna?, the acquired 

 function of prehension, and leaves them in their original condition 

 as tactile organs. 



There is also an entire absence of spines on the ventral surface of 

 the carapace, so that the animal nuist depend wholly on its maxilli- 

 peds for fastening itself to its host. 



This genus resembles Argulus and is unlike Dolops in that the 

 anterior maxillipeds are modified into sucking disks. 



On the other hand, it resembles Dolops and is unlike Argulus in the 

 complete suppression of the preoral sting. 



The posterior maxillipeds and the swimming legs are similar to 

 those of Argulus. 



[Xcovif=ii funnel, ;r6'AT7/= shield.) 



CHONOPELTIS INERMIS Thiele. 



Chonopeltis mermis Thiele, 1901. 



Cephalic area distinctly separated from the lateral areas by a tan- 

 gential chitin ridge on either side, between which the antenniB are 

 inserted. Abdomen with acuminate lobes; anal papilh^^. club-shaped 

 and situated on the sides of the sinus near the base. Basipods of the 

 swimming legs with a fringe of plumose setse; only the first pair have 

 flagella, and these are rudimentary; lobes on the posterior legs broad 

 and short. 



Carapace covering only the first two pairs of legs. 



Color blue with numerous dark spots on the back of the thoracic 

 segments. Length of the single specimen mm. ; width of the cara- 

 pace 3.5 mm. Male unknown. 



ILihHat. — From the gill cavity of a species of ClmmiK at Wieden- 

 hafen. 



{Inermis = unarmed . ) 



