36 PROCEEDINGS OF THE NATIONAL MUSEUM vou. 120 
from Rhyticeros plicatus subrujicollis (Blyth, 1843): 1 female from 
USNM skins from Domel Island, Mergui Archipelago, 1904, collected 
by W. L. Abbott, REE; from Rhyticeros plicatus mendanae (Hartert, 
1924): 1 male from CNHM skins from Guadalcanal, Solomon Islands, 
August-October 1944, collected by W. J. Beecher, REE; 1 male from 
MMAZskin from Guadalcanal, Solomon Islands, Jan. 20, 1944, collected 
by K. W. Prescott, REE. 
Drawings were made of the neotype male and the female, BM 13375. 
Specimens in BMNH. 
Bucerecolpocephalum, new genus 
Figures 64, 65 
Head triangular, width 1% to 1% times that of length. Forehead 
slightly narrower anteriorly. Temples expanded. Antennae 4- 
jointed, third segment constricted at base, and terminal segment 
capitate with definite signs of division into two parts, either by trans- 
verse line or marginal indentation. Antennary fossa deep, covered 
above by expansion of lateral margin of head, posterior margin of 
which lacks an eye. Dorsal-lateral margin of forehead above anten- 
nary fossa with shallow notch. Gular region narrow with a ridge on 
each lateral margin from which 8-11 setae extend. Pronotum ex- 
panded anteriorly with posterior marginal row of long setae. Meta- 
notum expanded posteriorly with posterior marginal row of long setae 
and 4-7 short setae on each lateral margin. Metanotum separated 
from mesonotum and from pleurites. The sclerotized median button 
behind the prothorax (fig. 25m) is a vestige of the mesonotum; the 
supposed mesonotum, the narrow sclerotized band posterior to 
this button, is a mere extension of the subcoxae (Cope, 1941). 
Thoracic sternal plates as shown in figures 64b and 64c. Metasternal 
plate oval with 14-24 setae. Venter of third femora and postero- 
lateral margins of abdominal sternite ITV each with combs of setae. 
Abdominal segments consist of tergites, sternites, and pleurites, the 
latter without prolongation of posteroventral angles. Abdominal 
tergites each with a posterior marginal row of setae, the most laterad 
being the postspiracular seta. Each lateral margin of abdominal 
tergites II-VIII with 1-4 short setae between the spiracle and post- 
spiracular seta. Sternites and pleurites each with a posterior mar- 
ginal row of long and short setae and with numerous short, usually 
thick setae. Male terminal abdominal sternites VIII and IX fused 
with complete division from sternite VII (fig. 65). Male genitalia 
as illustrated for each species with parameres anteriorly either en- 
larged or curved inwardly. Female terminal abdominal segments as 
illustrated for each species, with lateral processes arising from ventral 
