APR. 19, 1923 EWING: NEW GENERA AND SPECIES OF SUCKING LICE 147 
and species are based is a part of the collection of sucking lice of the 
United States National Museum, and in this museum the types are 
catalogued and deposited. 
Proenderleinellus, gen. nov. 
Second abdominal segment not provided with a pair of ventral tubercle- 
bearing plates. Number of pairs of abdominal pleural plates seven. An- 
tennae without any tooth-like processes; and head without paired plates 
situated on ventral surface between the antennae. First and second pairs 
of legs subequal and smaller than the last pair. Tibiae of first and second 
legs broadened distally and tarsi of the same legs broadened proximally, 
thus forming with the claws, clasping structures; first and second tarsal 
claws simple. Parameres of male genitalia long, arm-like. 
Type of genus: Proenderleinellus africanus, new species. 
This genus is related to Hoplopleura Enderlein on the one hand and to 
Microphthirus Ferris and Enderleinellus Fahrenholz on the other. Only 
the type species is included. 
Proenderleinellus africanus, sp. nov. 
Forehead fully twice as broad as long; postantennal region of head about 
as broad as long and with two pairs of dorsal setae, an anterior, minute pair just 
behind the antennae and a large posterior pair at the posterior angles. Anten- 
nae about as long as head; second segment the longest. Thorax with two 
pairs of dorsal setae, a small, very short, spine-like pair just inside and slightly 
in front of the thoracic spiracles and a very large, long, curved pair just 
inside and slightly posterior of the spiracles. Anterior process, or manu- 
brium, of sternum with parallel sides; sternum also with a posterior process 
extending between the posterior coxae. Abdomen with a lateral area both 
above and below without setae and between this lateral area and the pleurae 
on each typical abdominal segment are situated two setae. Typical pleural 
plates with two small, pectinate, posterior lateral lobes, and between them 
are situated the two, large, subequal, straight pleural setae. In typical 
pleural plates the stigmata is situated near the posterior margin. Genital 
armature of male with broad, parallel-sided, distally emarginate basal plate; 
long curved parameres; and stout, heavily chitinized pseudopenis. Posterior 
legs considerably enlarged, but not enormous, their expanded claws simple. 
Length of male, 1.42 mm.; width of male, 0.57 mm. 
Type host and type locality: From Thryonomys gregor pusillus (U.S.N.M. 
184180), taken at Majiya-Chumvi, British East Africa. 
Type.—Cat. No. 23760, U.S.N.M. 
Description based on a single male, but it is a perfect specimen. 
Pterophthirus, gen. nov. 
Antennae without lateral processes and essentially the same’in the two 
sexes. Typically each abdominal segment of female provided dorsally with 
three transverse rows of setae. Second sternal plate of abdomen not divided 
medially into two large rounded plates. Second pair of pleural plates not 
lobed, but enormous and wing-like and each bearing the small, spine-like 
pleural setae near its dorsal margin. 
Type of genus: Hoplopleura alata Ferris. 
