594 SAXD FLEAS FROM RHODE ISLAND— JUDD. vol. xviii. 



Sars/ in his description of the female, says: "Body semipellucid, 

 with a yellowish violet tinge, and mottled with iiregnlar si)ecks of a 

 cleai' orange hue, each segment being, moreover, bordered posteriorly 

 by a narrow band of dark, reddish brown pigment; on the anterior part 

 of the back occurs, besides, a rather conspicuous rounded shield of a 

 silvery luster, occui)ying the dorsal face of the third and fourth seg- 

 ments of mesosome." The IS^ewport specimens possess a silvery shield, 

 like the European form, but the rest of the body is dark olive, thus 

 making the animal opaque rather than semipellucid. From the tip of 

 the rostral projection of the cephalon to the tip of the telson the Ameri- 

 can form measures G.5 mm., the European only G. The coxa of the 

 last segment of the pereiou (Fig, 1) is as long in the longitudinal as in 



Fi-. 1. 

 CAi.Liopius KATHKEi, Female 



the dorso- ventral direction. In the specimen figured by iSars- the 

 dorso-ventral measurement is not much more than half as great as the 

 longitudinal. 



kSars, in his work on the European form, ligures calceoli,'' bat says 

 nothing of their structure. In the American form, calceoli occur on both 

 pairs of antenna'. Each calceolus consists of two parts. The basal or 

 proximal part has the form of a wineglass. On this rests the distal part, 

 which has the form of a slipper, the attachment being by means of the 

 end corresponding to the heel of the slipper. AVhile in Sars' specimens 

 the heel and toe iiarts are in the same plane, in my specimens they are 

 bent so as to make an angle of about 100*^ with each other. 



The position of the calceoli is important. Each articulus of the tiagel- 

 lum of the sxperior antenna bears two calceoli, which are situated on 

 the ventral portion of the articulus near the distal margin. IJoth may 

 be seen in the view of the antenna from its median side (Fig. 2 a). 



1 1893, I, Pt. 20, p. d48. 



2 PI. 157, fi.i;-. 2. 



3 PI. 157. 



