THE A CARINA OR .}nTES— BANKS. 



89 



been culled the n^mphal or copulatino- fenuilo { feniimna accopjjiatii) , for 

 it is in this stage that pairing occurs. The male mates with the 

 nymphal female, but pairing is prolonged for several days or until tiie 

 true adult female is fully developed within this nymphal female. 

 Fairing is performed through a small aperture behind the anus, and 

 not by the vulva, which lattiM- is not developed in the nymphal female 

 and oidy appears in the adult. The o\'iduct opens b}" the vulva. 

 AMien the true female escapes from the nym})hal 

 female, an ^^g<^^ already of considerable size, is 

 seen within her body. 



The Analgesida^ live upon birds, feeding on the 

 feathers, epidermal scales, etc. They rarely do 

 any damage to the ])irds, but are usually of serv- 

 ice in keeping the skin and feathers clean. They 

 remain on the host after death, often leaving the 

 feathers and congregating on the skin. Although 

 many of the species are now known from but one 

 host, there are some conmion forms that occur on 

 a considerable number of birds, frequently of 

 dill'erent genera. Likewise several species of 

 mites sometimes occur on the same bird. 



These mites were for a long time kept in the 

 genus l>errncileichu>< Koch, but this has ])een 

 shown to be a s^monym of Anahjes Nitzsch, 1818. 

 Many other genera have been formed in recent 

 years, and a revision of the famil}- by C-anestrini, 

 in "Das Tierreich,'' in 1809, includes 31 genera 

 and 7 subgenera. Several, however, are based on very slight char- 

 acters, and do not appear advisable. 



But few species have been recorded from this country. Mr. Tyrrell 

 and Professor Ilaller described several from Canada, and Doctor 

 Trouessart has taken some from American birds in the Paris museums. 



In the following table 1 have included all known from the I'^nited 

 States and Canada, and most of the larger genera that are apt to be 

 found here. 



1. Hind legs of the male not lengthened nor enlarged 2 



Some of the hind legs larger or longer tlian the anterior legs S 



2. Hind legs situate more under the body, very short; the fore legs of male with 



processes on some of the joints, body usually quite l)road Frei/'uid 



Hind legs more lateral ; legs I and II without projections in male ."! 



3. Tip of the male with foliaceous appendages; that of the female bifid, and with 



stout bristles Procioplii/Uodes 



Male without such appendages 4 



4. Female with tip of abdomen bifid, and provided with stout l)ristles. . .Pierodeclcs 

 Female with tip of abdomen entire ; 5 



5. Body broad, legs very short; in male two hook-like projections from each side 



of the rostrum ; tarsi end in claws MicrollcJius 



No such projections on rostrum; tarsi rarely end in claws (> 



Kl(i. 171.— HVPODEKAS co- 

 LUMB.E, A STAGE OF FAL- 



cuijfer; a, h, r, epimera 



(Kellicott). 



