NO. 2063. NORTH AMERICAN PARASITIC C0PEP0D8— WILSON. 613 



SALMINCOLA FALCULATA (Wilson). 

 Plate 31, figs. 43 and 44. 

 Leniaeopoda/alculata Wilson, 1908, p. 473, pi. 83. 



Host and record of specimens. — Four females from the gills of the 

 blue-back salmon, OncJiorJiyncTius nerlca, at Baker Lake,Washington, 

 in 1902 J by the United States Bureau of Fisheries,, Cat. No. 38586, 

 U.S.N.M. One female from Bristol Bay, Alaska^ no date or host, 

 Cat. No. 8340^ U.S.N.M. Three lots obtained by the United States 

 Bureau of Fisheries from trout in California, Cat. Nos. 38588, 38589, 

 and 38590, U.S.N.M. 



Remarlcs. — This species may be recognized by the abruptly nar- 

 rowed ends of the second maxillae, by the position and length of the 

 egg strings, and by the contour of the dorsal surface of the head. 

 The species was fully described and figured in 1908, but two figures, 

 one of them new, are here introduced for comparison. 



SALMINCOLA THYMALLI (Kessler). 



Plate 32, figs. 45 and 46. 



Lemaeopoda thymalli Kessleb, 1868, p. 97, pi. 4, fig. 3 a and 6.— Gadd, 1904, p. 34. 

 Lemaeopoda davigera Olsson, 1872, p. 63, pi. 5, figs. 1-6. 



Host and record of specimens. — A smgle female with egg strings 

 from the gills of Thymallus vulgaris at Yamtl, Sweden ; three females 

 without egg strings from Salmo alpinus at the same locality. Both 

 lots were obtained by exchange with the University of Stockholm; 

 the former is Cat. No. 20001, and the latter 19999, U.S.N.M. 



Specific characters of female. — Cephalo thorax egg or pear-shaped, 

 almost twice as long as wide, two-fifths as long as the trunk, and bent 

 at right angles to the axis of the latter, from which it is separated by 

 a deep groove and by the thickened bases of the second maxUlae. 

 Trunk considerably thicker than the cephalothorax, somewhat 

 flattened dorso-ventrally, with no traces of segmentation. A short 

 conical genital process on the posterior end of the trunk, a little 

 nearer the ventral surface; no abdomen, anal laminae, or posterior 

 processes. Egg strmgs cylindrical, two-fifths as wide as, and a little 

 longer than, the trunk; eggs small, arranged in 8 or 10 longitudinal 

 rows, about 20 eggs in each row. 



Fii-st antennae mdistinctly four-jointed; second pair biramose, 

 the endopod narrower and longer than the exopod and two-jointed, 

 ])oth rami covered with smaU spines. Fh-st maxillae smaU and tipped 

 with three setae; second maxillae stout, curved foi-wards and inwards, 

 their base at right angles to the body axis, and their tips considerably 

 enlarged. Bulla as long as the second maxillae, club-shaped, some- 

 times lanceolate, and three or four times as long as wide. It is always 

 buried in the tip of the gill filament and shows in its center an elongate 



