NO. 3558 MALLOPHAGA—ELBEL 19 
medially between the sclerital hooks slightly more in C. robusta 
than in C. bucerotis. 
Material examined: 4 males and 5 females from fresh and dried 
material collected in the Ethiopian region; from the type host: 3 
males and 3 females from Ambam, French Cameroons, Africa, 1955, 
collected by J. Mouchet, BMNH; 1 female from CNHM skin from 
Fougamou, Gabon, Africa, Aug. 4, 1951, collected by H. A. Beatty, 
REE; from Ceratogymna elata (Temminck, 1831): 1 male and 1 
female from Konn, French Cameroons, Africa, Apr. 26, 1947, collected 
by V. Aellen, BMNH 1954-487. 
Drawings were made of a male and a female from the type host 
collected in Ambam, French Cameroons, Africa. Specimens in 
BMNH. 
The acutovulvata Species-Group 
Species similar in shape to Chapinia traylori (figs. 25, 26). Differing 
from other species-groups in the following combination of characters: 
Dorsal-lateral margins of head with a preocular notch; venter of third 
femora and posterolateral margins of abdominal sternites IV—VI each 
with or without brushes of normal setae; each lateral margin of ab- 
dominal tergites II-VI with or without a short seta between the 
spiracle and postspiracular seta; females usually with more abdominal 
sternal setae than males; abdominal sternite II usually with one 
median row of setae on posterior margin; male genitalia without 
lateral horns on each side of endomeres and with parameres enlarged 
anteriorly, split posteriorly; females without sclerital hooks on each 
side of midline of ventral sclerite between vulva and anus; female 
abdominal sternite VIII with most of setae much shorter than those 
on the posterior margin, 
Hosts: Species of the acutovulvata species-group have been found 
on the genera Tockus, Anorrhinus, Penelopides, Rhyticeros, Anthra- 
coceros, and Buceros of the avian family Bucerotidae. 
Species of the acutovulvata species-group are all similar in size 
except that males of Chapinia wenzeli are smaller than other males, 
and females of C. traylori are larger than other females. The venter 
of the third femora and posterolateral margins of abdominal sternites 
IV-—VI each have large thick brushes of normal setae in both sexes of 
C. waniti, C. acutovulvata, C. malayensis, and C. hoplai; small scattered 
brushes of normal setae in females of CO. blakei and in both sexes of 
C. clayae, C. boonsongi, C. wenzeli, and C. lydae; brushes are absent 
in the male of C. blakei and in both sexes of C. traylort. Each lateral 
margin of abdominal tergites JI-VI has a short seta between the 
spiracle and postspiracular seta in C. clayae, C. waniti, C. acutovulvata, 
