112 Psyche [August 



vided into more than two plates. The genitalia afford an excellent 

 specific character, differing markedly from the genitalia of H. 

 arboricola, the nearest related species. The basal plate is ex- 

 panded at each end, the parameres are very short and stout and do 

 not enclose the penis as they do in H. arboricola, the arms of the 

 penis fitting into slight notches in the ends of the parameres. 



Hoplopleura hesperomydis Osborn. 



From Peromyscus maniculatus gambeli (Yosemite National 

 Park), skins of Onychomys torridus pulcher (Victorville, Calif.), 

 and Onychomys leucogaster arcticeps (Colorado Springs, Colo.), and 

 a freshly caught Mus musculub (Stanford University, Calif.). 

 This species is very similar to H. longula (Neum.) horn Mus minutus 

 of Europe, of which H. intermedia Fahrenholz is beyond any doubt 

 a synonym, but there are distinct differences in the pleural plates. 

 The type of the species is from Peromyscus {=Hesperomys 

 leucopus of the central states. 



There are European records of Anoplura from Mns mvsculus, 

 Hoplopleura acanthopus and Polyplax serrata having been credited 

 to it, but this is the first North American record. It would be a 

 matter of much interest to know if the same species occurs upon 

 this host in Europe. The specimens from Onychomys differ 

 somewhat from the others, the sternal plate being less rounded 

 anteriorly and less sharply pointed posteriorly and the hairs on 

 the abdomen being more numerous and much more slender, but 

 the amount of material at hand is not sufficient to justify separa- 

 ting the forms. 



Hoplopleura arboricola Kellogg & Ferris. 



From Sciurus douglasi albolimbatus, Sciurus griseus, Eutamias 

 speciosus frater and Eutamias alpinus (Yosemite National Park, 

 Calif.), and Eutamias merriami pricei (Stanford University, 

 Calif.). 



The type of the species is from Sciurus douglasi albolimbatus. 



Hoplopleura hirsuta sp. nov. 



Five females and six males from skins of Sigmodon hispidus 

 (Raleigh, N. C), S. hispidus texianus (Rockport, Tex.) in the 

 Stanford University collection, and S. hispidus eremicus (Sacaton, 



