NO. 3558 MALLOPHAGA—ELBEL 37 
sclerite between vulva and anus, with long stout setae and strong 
spines. Females similar to males in size, general shape, and chaeto- 
taxy except for terminal abdominal segments. 
Bucerocolpocephalum resembles most closely Bucerophagus (figs. 
66-69) but differs in several characters: The posterior margin of 
the expansion of the lateral margin of the head covering the antennary 
fossa lacks an eye in Bucerocolpocephalum, but an eye with a double 
cornea is present in Bucerophagus. The gular region has on each 
lateral ridge 8-11 setae in Bucerocolpocephalum, but the ridge is 
absent, and each lateral margin has at most eight setae in Bucero- 
phagus. The matasternal plate is oval in Bucerocolpocephalum but 
trapezoidal or triangular in Bucerophagus. The venter of the third 
femora has combs of setae in Bucerocolpocephalum but may have 
large thick brushes of normal setae in Bucerophagus; similar combs 
are present on posterolateral margins of abdominal sternite IV in 
Bucerocolpocephalum, and similar brushes are present on postero- 
lateral margins of abdominal sternites IV and V in Bucerophagus. 
Male genitalia of Bucerocolpocephalum are shorter than in Buceropha- 
gus. ‘The female anal fringe is weak in Bucerocolpocephalum and 
prominent in Bucerophagus. 
The male genitalia and details of the male and female terminal 
abdominal segments are the best characters for separating species 
of Bucerocolpocephalum. 
Hosts: Species of Bucerocolpocephalum have been found only on 
the genera Ptilolaemus and Anorrhinus of the avian family Bucero- 
tidae. (Genotype: Bucerocolpocephalum emersoni, new species.] 
Bucerocolpocephalum emersoni, new species 
Fieures 49, 57, 64, 65 
Both sexes are approximately the same size as corresponding sexes 
of Bucerocolpocephalum deignani (table 3). 
Male: As illustrated in figure 65. Metasternal plate with 16-20 
setae. Abdominal sternite II with 40-48 total setae. Terminal 
abdominal segments as shown in figure 65e. Genitalia as shown in 
figure 57. 
Female: As illustrated in figure 64. Resembles the male except 
that metasternal plate has 16-24 setae. Terminal abdominal tergite 
with 30-36 setae on posterior margin; abdominal sternite VIII with 
32-42 setae on posterior margin and with internal triangular sclerite; 
anal fringe with 44-48 weak setae (fig. 49). 
Discussion: Bucerocolpocephalum emersonit resembles most. closely 
B. deignani. Male terminal abdominal sternites VIII and IX have 
a lateral notch in B. emersoni but not in B. deignani. Male genitalia 
have parameres anteriorly slender, curved inwardly with each lateral 
