596 



SJXD FLEAS FROM RHODE ISLAND— JUDD. 



VOL. XVIIK 



INFEKIOR ANTENNA OK rALLIOl'IUS 



RATHKEi, Female. 



(,l) M.-.li: 



(ft) cross section ; porli- 

 cilceoli. 



possesses two rows, one of which has been overlooked by all previous 

 writers.' 



In the American representative of C. ndhJcei, the superior antenna 



appears more serrated than the inferior. This is because there are no 



calceoli on the ventral ftice of the inferior antenna. In Sars' figure 



both antenme ])ossess the same degree of serration, ventral 



calceoli occurring in both. 



The American C. rnthl-el differs, then, from the European 

 in size, color, and possibly in the number and arrangement 

 of the antennal sense organs. 



BYBLIS SERRATA. 



The description of Byblis serrata given 

 by Prof. S. I. Smith- is as follows: 



Female : Dorsum rounded above, with n» 

 trace of a longitudinal carina upon the abdo- 

 men; third segment of the abdomen broadly 

 rounded at the postero-lateral angle. Anteu- 

 nula about as long as the peduncle of the an- 

 tenna ; fourth segment of the peduncle of the 

 antenna longer than the fifth. Inferior margins of the epimeraof the first and second 

 l>airs of legs serrate, with slender and acute teeth alternating with the marginal 

 cilia; carpus in the first pair scarcely if any longer than the propodus; carpus in the 

 second pair very much longer than the propodus. In the third and fourth jiairs of 

 legs the dactylus as long as the propodus. Basal segment in the seventh pair of legs 

 expanding distally, the posterior margin nearly straight, tlie anterior and inferior 

 margins evenly arcuated, and reaching as far as the distal end of the carpus; the 

 carpus about as long as the ischium and nierus together, a little less than twice as 

 lono- as broad, and armed with long spines nponthe anterior and distal margins, but 

 the posterior margin wholly unarmed ; propodus almost as long as the carpus, and 

 nearly four times as long as broad, anterior margin unarmed, the posterior armed 

 upon the outside with two transverse rows of three or four spines, decreasing in size 

 as they recede from the margin, the distal end with a spine each side the slender 

 dactylus. Rami of the first pair of caudal stylets equal, as long as the base; outer 

 rami of the second pair shorter than the inner; rami of the posterior pair equal, 

 longer than the bases, reaching to the tips of the rami of the first pair. Telson as 

 long as breadth at base, cleft rather more than half its length, the lateral margin 

 arcuate and rapidly cimverging toward the evenly rounded extremity. 



Alcoholic specimens are pale yellowish ; the epimera, bases of posterior legs, and 

 the sides of the abdomen specked and mottled with numerous points of dark pig- 

 ment crowded irregularly together. 



Length, 10-12 mm. Deep Avater otf Vineyard Sound and Buzzards P>ay. 



To this accurate description of Professor Smith's I should like to 



add a general view (Fig. 4), and a few remarks about the living animal. 



My specimens were skimmed from the surface at night. They were 



' Through the kindness of Professor Sars, I have been able since writing this paper 

 to examine several specimens of the European form of C. rathkei collected by him. 

 These specimens were smaller than mine, lint, like them, possessed two rows of cal- 

 ceoli on each of the four antenna-. 



2 Kept. U. S. Fish Com., 1871-72, p. 561. 



