80 
The Non-Combed Eyed Siplionaptera 
reaching to the apex of the first hindtarsal segment. The fifth segment 
is short, being in the foretarsus (PI. IV, fig. 3) half as long again as it is 
broad. The measurements of the mid- and hindtarsi are as follows: 
Segment 
First 
Second 
Third 
Fourth 
Fifth 
Midtarsus : 
15 
19 
11 
7 
22 
Hindtarsus : 
38 
26 
17 
9 
24 
Modified segments. $. The apical margin of the eighth tergite is 
rounded, bearing on the outside a regular row of 7 to 9 long bristles and 
on the inside about a dozen shorter ones. There is on the outside a row 
of 3 or 4 long and 4 to 7 short bristles running from the stigma down¬ 
wards, while there are usually 4 bristles above the stigma, the apical 
one being the largest. The stylet is short, being about half as long 
again as it is broad. 
Length. $ 2 - 4 mm.; an exceptionally small specimen from Bolivia 
17 mm. 
We have 6 $ $ as follows: two cotypes of cavicolci from the 
collection of the late Professor Weyenbergh; and four specimens from 
Sucre, Bolivia, off Herodon boliviensis, 6th September, 1901, collected 
by P. 0. Simons. 
(11) Rhopalopsyllus litus spec. nov. 
This is the only known species of Rhopalopsyllus in which the occiput 
bears only two rows of bristles. 
Head. The bristles are slender. The anterior row of the frons 
consists of 5 bristles. The bristles situated beneath and behind the eye 
are apparently small (they are broken off in our two specimens). The 
anterior row of bristles of the occiput is absent. The second row 
contains only 2 fairly long bristles and 1 or 2 small hairs. The 
rostrum reaches the apex of the forecoxa, the labial palpus con¬ 
sisting of five segments. The first segment of the maxillary palpus 
is longer than the third, the second being a little shorter than the 
fourth. 
Thorax. The posterior row of bristles on the nota consists of 14 
bristles, the antemedian row containing on the pronotum about 12 small 
bristles and on the meso- and metanotum about 18, the metanotum 
bearing an additional row of 8 or 9 short bristles. There are 5 long 
bristles on the pleura of the mesothorax and 8 to 11 bristles in two rows 
on the epimerum of the metathorax (4 to 6, 4 or 5). 
