154 R. T. LEWIS ON IXODES REDUVIUS (lINN.). 



bottle. After about an hour I killed one pair with chloroform, 

 and examined the female without result, though the spermatozoa 

 were as usual present in the male. A second pair separated 

 spontaneously after a couple of hours. In this case plenty of 

 spermatozoa were present in the female. There seems no doubt 

 that I had separated the first pair prematurely. The third pair 

 were still attached after eighteen hours. I send you the two 

 slides showing the spermatozoa taken from the male and female 

 respectively for comparison. 



*' I have recently found a pair of /. hexagonus attached in a 

 similar manner. This is the third species that has been noticed 

 to employ the mouth organs when in copula." 



I have brought to the meeting this evening two slides mounted 

 by Mr. Wheler, showing the spermatozoa obtained from the male 

 and the female ticks in the second case mentioned in his letter, 

 and have placed the last-named under a microscope on the table 

 for the inspection of those members who may be interested in the 

 subject. A similar slide having been sent to Professor Neumann 

 at Toulouse, he writes as follows : " Your preparation of spermato- 

 zoa of Ixodes reduviv^s conforms to those which Pagenstecher has 

 figured in his ' Beitrage zur Anatomic der Milben H. 2.' " 



In further reference to the subject it may also be of interest to 

 mention that I have lately been favoured with a copy of a letter 

 addressed by Mr. Henry Tryon, the Naturalist of the Agricultural 

 Department at Brisbane, to Mr. P. P. Gordon, the Chief Inspector 

 of Stock in Queensland, from w^iom he had received a reprint of 

 the paper already referred to. In this letter Mr. Tryon points 

 out that the special labial processes which were described and 

 figured in the plate illustrating the paper were discovered by 

 Dr. H. A. Pagenstecher in 1861 " {I.e., Taf. I., fig. 2a), who said 

 that he had found behind each last and largest lateral hook two 

 anomalous forms which, according to his judgment, appeared 

 to be coarse blunt hooks. Mr. Tryon remarks, therefore, that, 

 " although it thus appears that Mr. Lewis has not been the 

 first to discover their existence, he has been the first to discover 

 their nature." It is perhaps also Avorth noting that Pagen- 

 stecher's observation was made in the case of Ixodes 7'icinus, 

 and not on /. reduvius, as described in my paper; which shows 

 at least that these organs are not confined to one species. 



Joum. Quekett Microscopical Club, Ser. 2, Vol. VIII., iN'^o. 49, November 1901. 



