26 Henry D. Ward 



be loaded down with such incomplete observations, and these are 

 entirely unnecessary when the observations are made at such a 

 time and place as that in question, where accurate data regarding 

 these species were easily obtainable. 



For reasons given in cxtenso elsewhere (Ward, 1905) and 

 already noted in the present paper, we must reject the classic 

 reference to Pigafetta, more correctly Lindschoten, as the 

 earliest authority to record a case of F. loa. 



3. MOREHOLOGY OF FiLARIA LOA 

 STRUCTURE OF THE PARASITE 



The appearance of the admirable account of Looss ( 1904) 

 makes any extended consideration of this topic superfluous. 

 Only those points are noted which are peculiar to the specimens 

 of this paper. 



In all I studied carefully three males, those removed by Drs. 

 Friend, Loveland, and Milroy, and have examined two others, 

 probably males of F. loa, sent me by Dr. Vail. I have had only 

 one female, an alcoholic specimen removed by Dr. Lippert and 

 sent me by Dr. Vail. 



One male from Dr. Vail measured about 16 mm. in length, 

 though the shrunken condition of both ends makes this measure- 

 ment only approximate ; the other male of this collection was 

 not complete. The male Loa in alcohol from Dr. Friend meas- 

 ured 25 mm. in length,^ and the specimen from Dr. Loveland, 

 which was mounted in balsam and appeared somewhat shrunken, 

 was about 22 mm. in length. 



In no one of these males was the tip of the tail as straight as 

 figured by Looss, but curved distinctly though only gradually. 

 From my original notes on the specimen of Dr. Milroy I excerpt 

 the following: 



The specimen measured approximately 28 mm. in length and 

 in alcohol was of a clear brown color, with distinctly marked 

 lateral lines. The slightly reflexed posterior end and projecting 

 spicules showed it to be a male. A more careful examination of 



^ Dr. Friend gives the length of this specimen living as 32 mm. 



296 



