FLEAS FROM ALBUQUERQUE — WILLIAMS AND HOFF 309 



group includes species in which there are three spiniforms on the 

 finger. Our form belongs in the second group and appears to be 

 closely related to A. hiemalis Eads and Menzies, 1948, from Texas. 

 In hiemalis the three spiniforms are subequally spaced along 

 nearly the entire posterior border, while in our new species the 

 spiniforms are more equally spaced and confined to about the dis- 

 tal half of the finger. In addition, in hiemalis there are a few 

 bristles in a row between the central and basal spiniforms of the 

 finger while in novomexicaneiisis no bristles occur between these 

 two spiniforms. 



Family DOLICHOPSYLLIDAE Baker, 1905 



ORCHOPEAS SEXDENTATUS (Baker, 1904), subspecies undetermined 



Difficulties incident to the determination of subspecies in this 

 species and the great variation that is observed in the lot of speci- 

 mens at hand preclude subspecies determination at this time. The 

 males in this collection usually have four spiniforms equally spaced 

 on the posterior border and one above, although rarely there are 

 only three equally spaced spiniforms on the posterior border and 

 one above. Sternite IX of the male has one black spiniform and 

 three bristles. In the female the apical outline of sternite VII is 

 variable. Of the two lobes, there is a large amount of variation 

 in the upper lobe. In some females the upper lobe may be longer 

 than the lower lobe and the upper lobe may be pointed or rounded 

 at the tip. The spermatheca is typically that of the species with 

 the body barrel-shaped and with a crooked tail. Records of this un- 

 determined subspecies include specimens taken from Neotoma 

 micropus canescens, captured along the Rio Puerco near the U. S. 

 Route 66 bridge and about 18 miles west of Albuquerque, on Feb- 

 ruary 28, 1948, specimens from the same host, as well as a nest 

 taken from the foothills of the Sandia Mountains, 5 miles east of 

 Albuquerque, in December 1947, and from other nests taken in 

 the same location on October 10, 1948. 



THRASSIS PANSUS (Jordan, 1925) 



Dr. Frank M. Prince, in litt., informs us that in the lot of our 

 specimens examined by him the parameres are shaped differently 

 from those in specimens from Cochise County, Arizona (type lo- 

 cality) . However, he considers our specimens to be of this species. 

 Thrassis pansus has been taken by us from Omjchomys leucogaster, 

 captured on the grassland a few miles east of Albuquerque, Sep- 

 tember 25, 1948, and has been removed in large numbers from 

 Citellus spilosoma major, captured on various dates on the Uni- 

 versity of New Mexico golf course and within a few miles north 



