34 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
dried material that she obtained from Rhyticeros cassidiz and other 
hosts in the USNM and for much help in preparation of the manu- 
script. 
The hirta Species-Group 
Species similar in shape to Chapinia traylori (figs. 25, 26). Differ- 
ing from other species-groups in the following combination of charac- 
ters: Dorsal-lateral margins of head with a preocular notch; venter 
of third femora and posterolateral margins of abdominal sternites 
IV-VI each with small scattered brushes of normal setae which are 
not as numerous on abdominal sternite VI; each lateral margin of 
abdominal tergites II-VI without a short seta between the spiracle 
and postspiracular seta; females with approximately the same number 
of abdominal sternal setae as males; abdominal sternite II with 
three median rows of setae; male genitalia much narrower than for 
other species-groups, without lateral horns on each side of endomeres, 
and with parameres not enlarged anteriorly but 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 posterior margin. 
Hosts: Species of the hirta species-group have been found only on 
the genera Penelopides and Rhyticeros of the avian family Bucerotidae. 
Chapinia muesebecki, new species 
Ficures 18, 21 
Male: Smaller than Chapinia traylori in all measurements except 
length of head (table 1). Abdominal sternite II with 58-62 total 
setae. ‘Terminal abdominal segments as shown in figure 21. Gen- 
italia as shown in figure 18. 
Female: Unknown. 
Discussion: Chapinia muesebecki resembles most closely C. hirta. 
Male terminal abdominal segments are shorter in C. muesebecki than 
in C. hirta, and the partial division between abdominal sternites 
VII and VIII is not as pronounced in C. muesebecki as in C. hirta. 
The sclerite of male genital sac is nearly twice as long as wide in 
C. muesebecki but approximately as wide as long in C. hirta, and this 
sclerite is approximately three times as long in C. muesebecki as in 
C. hirta. 
Material examined: 2 males from dried skins collected in the 
Celebes. 
Type host: Penelopides e. exarhatus (Temminck, 1823). 
Type material: Holotype male from USNM skins from Celebes, 
1914-1916, collected by H. C. Raven, REE in USNM. Paratype 
male with same data. 
