38 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
point reaching endomeres in B. emersoni and anteriorly enlarged, not 
curved inwardly, in B. deignani; endomeres have a pair of posterior 
points in B. emersoni which are absent in B. deignant. The female 
terminal abdominal tergite has thick setae along the entire posterior 
margin in B. emersoni, but thick setae are absent medially in B. 
deignani. The female abdominal sternite VIII has an internal tri- 
angular sclerite in B. emersoni that is absent in B. deignant. 
Material examined: 13 males and 19 females from fresh and dried 
material collected in the Oriental region. 
Type host: Ptilolaemus tickelli austen (Jerdon, 1872). 
Type material: Holotype male and allotype female from Phu Lom 
Lo Mt., Kok Sathon, Dan Sai, Loei, Thailand, Mar. 23, 1954, col- 
lected by Robert E. Elbel, USNM. Paratypes: 8 males and 15 
females with same data; from Ptilolaemus tickelli indochinensis 
Delacour and Jabouille, 1928: 4 males and 3 females from CNHM 
skins from Muong Yo, Laos, and Muong Maun, Tonkin, Indochina, 
March—May 1929, collected by Van Tyne, REE. 
Bucerocolpocephalum emersoni is named for Dr. K. C. Emerson, 
Stillwater, Okla., in appreciation for his untiring help and advice 
throughout this study, particularly in the preparation of the manu- 
script and illustrations, and in other studies on Oriental Mallophaga. 
Bucerocolpocephalum deignani, new species 
Ficures 50, 58, 59 
Both sexes are approximately the same size as corresponding sexes 
of Bucerocolpocephalum emersoni (table 3). 
Male: Metasternal plate with 14-18 setae. Abdominal sternite II 
with 44-46 total setae. Terminal abdominal segments as shown in 
figure 59. Genitalia as shown in figure 58. 
Female: Resembles the male except that abdominal sternite II has 
42-58 total setae. Terminal abdominal tergite with 28-34 setae on 
posterior margin; abdominal sternite VIII with 34-42 setae on poste- 
rior margin; anal fringe with 24-40 weak setae (fig. 50). 
Discussion: Bucerocolpocephalum deignani resembles most closely 
B. emersoni. Male terminal abdominal sternites VIII and IX lack 
the lateral notch in B. deignani that is present in B. emersoni. Male 
genitalia have parameres anteriorly enlarged, not curved inwardly, 
in B. deignani and anteriorly slender, curved inwardly with each 
lateral point reaching endomeres in B. emersoni; endomeres lack the 
pair of posterior points in B. deignani that are present in B. emersoni. 
The female terminal abdominal tergite lacks thick setae medially on 
the posterior margin in B. deignani, but thick setae are present along 
this entire margin in B. emersoni. The female abdominal sternite 
