no. 1404. PARASITIC COPEPODS—CALIGIDJE— WILSON. 587 



niinal spines on the last joint graded in size, the inner one twice as 

 long as the outer. 



Total length 5 mm. Length of carapace 2.6 mm.; width of same 

 2.3 nun.; length of genital segment 1.4 mm.; length of abdomen 

 1 nun.; length of egg strings 3 mm. 



Color a light yellowish brown without pigment (in preserved speci- 

 mens). 



(belones, generic name of one of its hosts.) 



The National Museum collection includes a single lot of this species 

 from the body of a small dolphin {Coryphaena equisetis), without a 

 number, and with the locality not given. 



But as the label bears the signature of Mr. Vinal N. Edwards, and 

 was given to the author with other material collected at Woods Hole, 

 it is probable that the dolphin was caught in the North Atlantic. 

 The lot includes two females which resemble Kroyer's species so 

 closely as to leave no doubt of the identity. Kroyer states that in his 

 specimens the abdomen was indistinctly segmented, but these two 

 show no sign of segmentation. The furca on these specimens is also 

 somewhat different but not enough so to warrant specific distinction. 

 In all other particulars the two lots agree perfectly. The present host, 

 the small dolphin, is a new one, this species having been found pre- 

 viously upon Bel one vulgaris, on what Kroyer calls the "Hornfish," 

 and on what Olsson designates as the "Beak fish." It is more of a 

 tropical than a northern species. 



CALIGUS LATIFRONS, new species. 

 Plate XII, figs. 140-149. 



Ft male. — Carapace half the entire length, a little longer than wide, 

 considerably narrowed anteriorly. Frontal plates very wide and 

 prominent; lunules large, almost circular in outline, and projecting 

 far in front of. and laterally over the bases of, the first antenna?. Eyes 

 large and situated far forward close to the anterior margin of the cara- 

 pace. Posterior sinuses wide and oblique, leaving a median lobe five- 

 eighths the width of the carapace and quite squarely truncated pos- 

 teriorly. Lateral lobes narrow and curved inward at the tip. Thoracic 

 area se\ -en-eighths the entire width of the carapace and almost exactly 

 one-half the length, the anterior groove flattened similarly to the pos- 

 terior margin of the median lobe. 



Free thorax segment two-thirds as wide as the genital segment, ab- 

 ruptly narrowed in front of the fourth legs. 



Genital segment nearly quadrate with well-rounded corners, a little 

 more than half as long as the carapace and not quite half as wide. 

 A.bdomen about four-fifths the length of the genital segment, one-half 

 longer than wide, swollen at the center, and narrowed at either end. 



