10 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
TABLE OF SPECIES. 
A!, Stem of venation bare (subgenus Mesembrinelia). 
a’. Two presutural bristles present. 
b'. Legs almost black, but middle and hind femora yellow on apical half. 
c!, Wing with heavy subcostal black stripe, not reaching the third vein, the 
posterior portion paler; 3 posterior acrostichals (Bolivia, Surinam). 
brunnipes Surcouf. 
c?. Wing deep brown, the second fourth, except behind, yellow (Bolivia). 
pictipennis, new species. 
62. Femora and tibiae yellow. 
cl. Apical cell very wide open, the costal section included more than half as 
long as the preceding one (Cesta Rica, Ecuador)..umbrosa, new species. 
c?, Apical cell less widely open, the included costal section less than half the 
preceding. 
d'. Wing with only diffuse and not very strong infuscation (widespread 
HEOUOPLCAl isco New ere ere ee cag ee ciate, a nee a bicolor Fabricius. 
d?. Wing with heavy blackish subcostal stripe, beyond middle, before 
thirdsvein (Brazile. 2 De Ps APO. batesi, new species. 
a?, Only one presutural present. 
bt. Fourth abdominal segment with a discal row of bristles. 
cl. Femora, pleurae, and whole abdomen black; second posthumeral large; 
2 pairs anterior acrostichals (Peru)..............-. eruciata Townsend. 
c*. Femora, pleurae, and base of abdomen yellow. 
d'. One pair anterior acrostichals. 
éy VPosthum crab (Panama iia Whine ue tibialis, new species. 
e?. Posthumerals 2 (South America)...-.....-.- aeneiventris Wiedemann. 
d?. No anterior acrostichals (Brazil).............. purpurata, new species. 
b?. Fourth abdominal segment without discals. 
ce. Facial ridges high and sharp, with bristles to middle; middle and hind tibiae 
not at all infuscated; sternopleurals 2, 1 (Costa Rica). 
facialis, new species. 
c?. Facial ridges lower and not bristly except near vibrissae. 
d'. Segments 2-4 of abdomen with posterior third or fourth of purple color, 
sharply limited anteriorly. 
e!. No anterior acrostichals, only one intraalar (the posterior) (Brazil). 
pauciseta, new species. 
e?, One or two anterior acrostichals; two intraalars (Brazil). 
cyaneicincta Surcouf. 
d?, Abdomen without purple bands. 
e}. Third abdominal segment with ee weak hairs along the hind margin 
above (South America)....... ........ randa Walker. 
e’. Third abdominal segment with a ‘ynarginal row of well-developed 
bristles. 
f!, Middle and hind tibiae black, in male the middle ones elongated 
and with all the bristles very minute (flavipennis Macquart). 
quadrilineata Fabricius. 
f?. Middle and hind tibiae not or hardly infuscated, the male with the 
usual bristles on middle tibiae....... dorsimacula, new species. 
A?, Stem of venation ciliated behind (subgenus Mesembolia, type bellardiana). 
a}. Greatest width of apical cell exceeding the length of the hind cross vein. 
b'. Apical cell moderately wide open in margin, the intercepted costal segment 
not more than half the preceding one; no acrostichals immediately behind 
the suture (Mexico to Paraguay)............-.. bellardiana, new species. 
b?. Apical cell very wide open, the ee costal segment more than half 
the preceding (Brazil) .......... Pte fulvipes, new species. 
a?, Greatest width of apical cell less than hind cross vein . (Brazil). 
peregrina, new species 
