1895. 



PHOCEEDIXGS OF THE NATIONAL MUSEUM. 



595 



Small bristliiit;' liaiis ciicii-cle the bases of both, calceoli. The more 

 ventral of tlie two calceoli is nearer tlie distal marjiin of the articulus 

 find close to two long blunt cylindrical hairs. (Fig. - />, li <:'.) 



These hairs obscure the ventral calceolas in a view from the lateral 

 side, for they are just outside or lateral to the calceolus. In the 

 c'ldarged view given by Sars' 



these ventral calceoli are seen ■ ^ 



uith distinctness; just dorsal 

 to a number of these ventral 

 calceoli is a series of circles. 

 If the.-e circles aie meant for 

 calceoli, I think that Sars is in 

 error, because the median cal- 

 ceoli lie on the opposite (me- 

 dian) face and could not be seen in this view of the 

 apj)endage. 



Sars states with emphasis that the terminal lappet 

 of the third articulus of the tlagellum has only two cal- 

 ceoli. The American representative has four at least. 



Each articulus of the fla- 

 gellum of the inferior an- 

 tenna bears two calceoli on its 

 median face (Fi,u. .3). Onecal- 

 < eolus is more dorsal than the 

 other. The dorsal calceolus 

 S})rings from a ])oint at some 

 distance proximal to that from 

 which the ventral calceolus 

 arises. A lateral view of the 

 appendage shows the calceoli 

 oidy dimly, if at all, for the an- 

 tenna is too opaque to allow 

 tiiem to be seen with distinct- 

 ness through it. In a similar s^L-'menis-, (,),.r„ssseci,..n. 



view, Sars shows distinctly the ventral calceoli, and leaves us to inter- 

 pret a series of circles which lie dorsal to them. 



While there are two rows of calceoli on each of the antenn;e of my 

 specimens of CaUiopiua rathl-ei, in Sars' descrii)tion of the genus CalU- 

 ojrius^ I find no allusion to more than a single row of these organs; 

 but, in view of the fact that (J. lu'riiisculus and the American form of 

 €. ratlilei both possess two rows of calceoli on each of the four anteumie, 

 I am led to believe that the European form of C. ratMei probably also 



/ 



ifij/ 



Fig. 2. 



SL"PEl;l()I{ ANTENNA OF CALLIOPICi 

 I, M ■(i:aT, surface with calceoli ; (A) ventral 



KATHKEI, Female. 



urface of fifth to .seventh 



>P1. 157; fig. 2c. 



-Specimeus of C. hi riiisculus, wliicli wero proonre<l from tlic ^hiseiuu of Coinjiara- 

 tivc Zoology in Cambridge, Massaohii.setts. tlirougb the kindnoss of Dr. "Walter 

 Faxou, showed two rows of calceoli ou each antenna. 



