40 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
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 
66b, 66c, 68b, 68c, and 70. Metasternal plate trapezoidal or triangular, 
expanded anteriorly, with 6-34 setae. Venter of third femora and 
posterolateral margins of abdominal sternites IV and V each with or 
without large thick brushes of normal setae. Abdominal segments 
consist of tergites, sternites, and pleurites, the latter without prolonga- 
tion of posteroventral angles. Abdominal tergites each with a 
posterior marginal row of setae, the most laterad being the post- 
spiracular seta. Each lateral margin of abdominal tergites II-VII 
with or without 1-5 short setae between the spiracle and postspiracular 
seta. Sternites and pleurites each with a posterior marginal row of 
long setae and with numerous shorter setae. Male terminal abdom- 
inal sternites VIII and IX either fused or not but with complete 
division from abdominal sternite VII (figs. 67, 69). Male genitalia 
as illustrated for each species with parameres branched anteriorly and 
either split or unsplit posteriorly. Female terminal abdominal seg- 
ments as illustrated for each species with lateral processes arising from 
ventral sclerite between vulva and anus with long stout setae and 
strong spines. Females larger than males, usually with more abdom- 
inal sternal setae but general shape and chaetotaxy similar to that of 
males except for terminal abdominal segments. 
Bucerophagus resembles both Chapinia (figs. 23-26) and Bucerocol- 
pocephalum (figs. 64, 65) but differs in several characters: The termi- 
nal segment of the antenna shows definite signs of division into two 
parts either by transverse line or marginal indentation in Bucerophagus 
and Bucerocolpocephalum, but there is no sign of division in Chapinia. 
The posterior margin of the expansion of the lateral margin of the 
head covering the antennary fossa has an eye with a double cornea 
in Bucerophagus and Chapinia, but an eye is absent in Bucerocol- 
pocephalum. The gular region lacks a lateral ridge and each lateral 
margin has at most 8 setae in Bucerophagus and Chapinia, but each 
lateral ridge has 8-11 setae in Bucerocolpocephalum. The metasternal 
plate is trapezoidal or triangular in Bucerophagus and Chapinia but 
oval in Bucerocolpocephalum. 'The venter of the third femora may 
have brushes of normal setae in Bucerophagus and Chapinia but has 
combs of setae in Bucerocolpocephalum; similar brushes are present 
on posterolateral margins of abdominal sternites IV and V in Bucero- 
phagus and abdominal sternites IV-VI in Chapinia, but combs of 
setae are present on posterolateral margins of abdominal sternite [TV in 
Bucerocolpocephalum. Each lateral margin of abdominal tergites 
II-VIII may have 1-5 short setae between the spiracle and post- 
spiracular seta in Bucerophagus and Bucerocolpocephalum, but one 
