12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



Remarks. — Described from a female taken from the type host, a 

 red-backed mouse, at the type locality, by Francis Harper, July 25, 

 1925. This species differs from our other known American species of 

 Demiamfssus in having the chelicerae inflated and toothed at their 

 apices. 



DERMANYSSUS PROGNEPHILUS, new species 



Plate 4, Figure 3 



Similar in appearance to the common chicken mite, Dertnanyssus 

 gallm-ae (DeGeer). Peritremes extending forward to opposite the 

 first j)air of coxae. Palpi reaching to slightly beyond the middle of 

 first patellae. Chelicerae exceedingly long and slender, when fully 

 extended reaching to the middle of the first tarsi, not broadened or 

 toothed distally. Sternal plate poorly sclerotized, constituting a 

 transverse arched band. Anal plate longer than broad, almost egg- 

 shaped in outline; anal opening twice as long as broad and situated 

 a little over one half of its greatest diameter from the posterior 

 border; paired anal setae situated slightly in front of a transverse 

 line drawn through middle of anus ; unpaired seta similar to paired 

 ones and situated halfway between posterior border of anus and 

 posterior border of anal plate. First and last pairs of legs of about 

 the same length and longer than the others. Length of female, 

 0.82 mm ; width, 0.42 mm. 



Type host. — Progne suhis. 



Type locality. — Bell, Md. 



Tijpe slide.— \J.S.'^.M. no. 1078. 



Remarks. — Described from two females, which formed part of a 

 lot of five individuals (two at least being nymphs) taken from the 

 nest of type host, the purple martin, at the type locality by W. L. 

 McAtee, September 23, 1926. This species is near Dei'maiiyssus gal- 

 linae (DeGeer) but has longer peritremes and a differently shaped 

 anal plate. 



Subfamily Rhinonyssinae 



SOMMATERICOLA Tragardh, 1904 



Body very stout; integument leathery. Chelicerae rather stout, 

 of the piercing type, teeth absent, movable chela clawlike. Palpi 

 very short and stout, provided with a few spines. Spiracles situ- 

 ated dorsally. No dorsal plate present. Legs exceedingly short 

 and stout, subequal; tarsal claws small, subequal; coxae stout, with- 

 out spines. 



Type species. — Sominatericola levinseni Tragardh, 1904, 

 Remarks. — Females of Sominatericola have the same type of 

 chelicerae as those of the monkey-infesting genus Pnemiionyssus De 



