96 BRITISH TYROGLYPHIM. 



the meantime ; it must not be forgotten that Gudden's 

 paper, in consequence probably of the unusual 

 periodical in which it was published, was missed by 

 all acarologists until after Nalepa's papers appeared. 



The female reproductive organs consist of the 

 external bursa copulatrix, the passage between the 

 bursa and the receptaculum seminis, the last-named 

 organ itself, the ovaries, the oviducts, the vagina, the 

 external vulva with its sclerites, and the so-called 

 genital suckers. 



The Bursa Copulatrix (PL C, figs. 1, 11 ; PI. B, 

 fig. 8, be), which was first discovered by Grudden, and 

 has subsequently been frequently rediscovered by other 

 acarologists who have somehow missed the works of 

 previous writers ; is, in the genus Tyroglyplius, and in 

 most other Tyroglyphidae, a small round hole ; retro- 

 anal in position, opening at or near the posterior end 

 of the body in the median line : it is very incon- 

 spicuous, and not always easy to find ; but it is there. 

 (Sudden's paper having been overlooked, both by 

 myself and other acarologists, I believe that I was 

 the next to point out the retro-anal position of the 

 bursa in 1879.* This I did from actual observation 

 of the c? and ? of Glycyphagus spinipes in coitu. I 

 then saw that the curious projection in the median line 

 of the posterior end of the abdomen of the ? in the 

 genus Glycyphagus was a bursa copulatrix ; this fact 

 had been overlooked by previous authors. Koch had 

 figured the projection in several species forty years 

 before ; Fumouze and Robin had observed that it was 

 tubular ; t but it does not seem to have struck anyone 

 that it was a bursa copulatrix or indeed that it was 

 functional at all. 



My paper was also overlooked, and Kramer J and 



* " On some Peculiarities in the Reproductive System of Certain of 

 the Acarina," ' J. Quekett Club/ 1879, vol. v, pp. 227, 228, pi. xiii, figs. 

 5,6. 



f ' Mem. Acar./ pp. 572, 574, and elsewhere. 



J " Ueber die post-embryonale Entwicklung bei der Milbengattung 

 Glyciphagus," in 'Arch. Naturg.,' 1880, Jahrg. 40, p. 103. 



