ART. 20. STUDIES OF THE BITING LICE — EWING. 11 



tal armature of male large and heavily chitinized, basal plate shield- 

 shape, parameres shaped like a pair of mandibles. Each pair of 

 legs differently formed as is characteristic of the genus. Claw 

 of tarsus I the largest, of tarsus II the smallest; claw of the last 

 tarsus (fig. 4) about twice as long as claw of tarsus II. Tip of tibia 

 III (fig. 4) provided with stout, flattened spines at its apex and 

 below with an oblique row of three long spines. Femur II (fig. 1) 

 semicircular, with a very large tenaculum, which is one-lobed in 

 front and two-lobed behind. 



Length of female, 1.67 mm.; width, 0.49 mm. Length of male, 

 1.54 mm. ; width, 0.55 mm. 



Type host and type locality. — Harrison (1916) gave Abrocoma 

 hennetti as the type host of this species, notwithstanding the type 

 specimen had not been selected. The specimen which Neumann had 

 from Abrocoma he7wetti is here designated as type, which designa- 



. / 



Fig. 4. — MoNOGYROPUs longds. Left posterior leg from bei.ow. 



tion should fix this host as the type host. The host was taken in 

 Chile. 



Described from a large number of specimens mounted on four 

 slides and determined originally by Paine as Gyropus longm Neu- 

 mann. They were taken on Abrocoma from Valenar, Chile, by 

 Porter. Neumann based his original description on a large number 

 of specimens, for the most part females taken on "Ratones" at 

 Penaflor, Chile, by Porter and a single female from Abroc&ma ben- 

 netti, Chile, by Trouessart. 



MONOGYROPUS PARVUS new species. 



Text flf?. 5. 

 A small, pale louse. Head very broad, broader than long, with a 

 transverse row of six very large dorsal setae on the temporal region. 

 Antennae of the usual type, each about filling its fossa, last segment 



