Aiir.20. STUDIES OF THE BITING LICE — EWING. 23 



then almost straight and converging posteriorly. Mesothorax not 

 so broad as prothorax; metathorax about equal to prothorax in 

 width. Abdomen sparsely clothed with setae, the largest of which 

 are arranged into four longitudinal rows Large lateral setae on 

 segments III, IV, V, VI, and VII. Gonopods rudimentary but tlieir 

 setae unusually large, some of them being about as long as the lateral 

 setae. Legs II and III subequal and each with the accessory tubercle 

 of femoral tenaculum small (fig. 10). The front pair of legs is 

 broken oft' of the single specimen at hand. 



Length, 1.51 mm.; width, 0.55 mm. 



Tijfe host and type locality. — Hoplomys gymnurus from San 

 Javier, Ecuador. 



Tijpe.— Cat. No. 23753, U.S.N.M. 



Described from a single female, the holotype. combed from the 

 skin of a male Hoplomys r/ymnvrvs (Cat. No. 113270, U.S.N.M.) 

 from San Javier, Ecuador. This species is particularly differen- 

 tiated from T. lineafvs by the characters given in the key. 



TETRAGYROPUS AOTOPHILUS. new species. 

 Text fig. 11. 



Last nymphal mstar. — Head broader than long; temporal lobes 

 not evenly rounded; antenae short, last segment spherical; palpi 

 with four segments distinct. Above, the head bears two transverse 

 rows of setae; one of minute setae across the middle part of the 

 head and one of very large, straight setae, eight in number, near 

 the posterior border. Prothorax small, slightly over one-half as 

 broad as the head and irregularly diamond-shaped ; on its posterior 

 border is situated a row of four large dorsal setae. Mesothorax 

 large, equal to the head in length and width, sides diverging pos- 

 teriorly; above, near the middle, is a pair of long setae and at each 

 posterior corner is a large seta. Metathorax slightly broader than 

 the mesothorax and about as long; above it has two pairs of lateral 

 setae and several other smaller setae. Abdomen oval, almost as 

 broad as long, provided above with four longitudinal rows of con- 

 spicuous setae, the setae of the two outer rows being smaller than 

 those of the two inner, and two sublateral longitudinal rows of 

 minute setae, there being a single seta to each abdominal segment. 

 Lateral setae present on each abdominal segment except the last 

 and almost enormous in size. Legs very stout, the anterior pair 

 the smallest and the second and third pair subequal. In the case 

 of either leg II or III the femur is very stout nnd short, and the 

 tubercle of the femoral tenaculum is long, angulnte and doubtless 

 acts as a thumb in apposition to the tarsus, the tibia is bent into 

 an elbow near its base, and the tarsus is very large and stout and 



