16 PROCEEDINGS OF THE NATIONAL MUSEUM VoL. 120 
alcohol. The slide specimens were remounted and the male is desig- 
nated hereby as a lectotype; the slide has been so labeled. Approxi- 
mately one-half of the syntype material formerly in alcohol was 
mounted. 
Male: Smaller than Chapinia robusta in all measurements (table 1). 
Venter of third femora and posterolateral margins of abdominal 
sternites [V—VI each with large thick brushes of normal setae. Each 
lateral margin of abdominal tergites II-VI with a short seta between 
the spiracle and postspiracular seta. Abdominal sternite II with 
60-82 setae and three median rows of setae. Terminal abdominal 
segments as shown in figure 5. Genitalia as shown in figure 6, each 
lateral horn with two sharp posterior points, one of which crosses the 
broad endomeres. 
Female: Approximately the same size as Chapinia robusta (table 2). 
Resembles the male except that abdominal sternite II has 68-104 
total setae. Terminal abdominal tergite with 22-32 setae, short 
setae alternating with long, on posterior margin; ventral sclerite 
between vulva and anus elevated medially between sclerital hooks 
(fig. 29). Anal fringe with 58-72 setae (fig. 30). 
Discussion: Kellogg (1908) gave the following measurements (inmm). 
male Jemale 
length of head 0.33 0.40 
width of head 0.65 0.72 
width of abdomen 0.80 1.10 
total length 2.00 2.80 
These measurements are slightly larger than those given here for 
Chapinia bucerotis (tables 1, 2). C. bucerotis resembles most closely 
C. lophocerus. The venter of the third femora and posterolateral 
margins of abdominal sternites IV-VI each have large thick brushes 
of normal setae in C. bucerotis but small scattered brushes of normal 
setae in other species of the lophocerus species-group. Each lateral 
margin of abdominal tergites II-VI has a short seta between the 
spiracle and postspiracular seta in C. bucerotis but not in C. robusta. 
Abdominal sternite II of both sexes has more than 58 total setae in 
C. bucerotis but fewer than 58 total setae in C. lophocerus; this sternite 
has three median rows of setae in C. bucerotis but one median row 
of setae on posterior margin in other species of the lophocerus species- 
group. The male genitalia have each lateral horn possessing two 
sharp posterior points in C. bucerotis and C. lophocerus, but one 
point crosses the broad endomeres in C. bucerotis, and the points do 
not reach the slender endomeres in C. lophocerus; each lateral horn 
in C. robusta has one sharp median point that crosses the broad 
endomeres. The ventral sclerite between female vulva and anus is 
elevated medially between the sclerital hooks in C. bucerotis almost 
