D. Keilin and G. H. F. Nuttall 
287 
part of the uterus prolapsed but these were removed prior to drawing the 
figure. Abdominal muscles: dorsally as in d, ventrally as in $; no other 
internal organs visible. 
SPECIMEN 3, f PL XV, fig. 3. 
Dorsal bands and legs as in normal <$. $ genitalia slightly deformed. 
$ genitalia with gonopods well developed, unequal, rotated somewhat out of 
their normal axes, the smaller gonopod with sensory hairs upon its dorsal 
surface instead of along its posterior border. $ ventral plate divided in two 
parts both clearly separated from the $ plate. Abdominal muscles: dorsally 
as in cJ, ventrally as in $ but abnormal in being confined to one middle segment 
less (as in Specimen 12, Text-fig. 8). Internal organs: two pairs of normal 
testes, vesicula seminalis deformed through being compressed by the vagina; 
a peculiar body near the anterior right-hand testis may represent a young egg. 
SPECIMEN 4, Not illustrated. 
Dorsal bands as in Legs: pair I as in d, pair III as in $. genitalia 
well developed, with dilator point slightly distorted. £ genitalia with gonopods 
well developed and rotated out of their axes as in Specimen 3. Dorsal and 
ventral abdominal muscles as in <J. 
SPECIMEN 5, f PI. XVI, fig. 1, and Text-fig. 6. 
Dorsal bands complete but showing abnormal tendency 
to fuse. Legs: pair I as in <$, pair III with slight ? character, 
d genitalia abnormal, the basal plate narrow and the dilator 
twisted. $ genitalia with gonopods short, compressed, un¬ 
equal, widely separated apically. Vagina prolapsed (vag.p., 
PI. XVI, fig. 1), raising the gonopods and $ ventral plate 
above the abdominal surface, this plate transversely elongate, 
with sharp lateral angles and deep emargination in the 
postero-median line. $ ventral plate divided, the portions 
widely separated. Dorsal and ventral abdominal muscles as 
in 
SPECIMEN 6, <J. Not illustrated. 
Similar to Specimen 5, but leg III is of $ type. The 
prolapse beneath the gonopods is long and tubular as in 
Specimen 2. Posterior end of abdomen ruptured and $ genitalia with vesica 
penis protruded (accidental injury). Dorsal muscles as in <3, ventral muscles 
macerated but judging from remnants also of d character. 
SPECIMEN 7, f PL XVI, fig. 3. 
Dorsal bands as in <J. Legs missing, d genitalia reduced in size. <$ ventral 
plate divided in two parts of unequal size. $ genitalia showing a very remark¬ 
able abnormality, the different parts observable being difficult to homologize 
Parasitology xi 19 
Text-fig. (j. Pedi- 
culus humanus 
race corporis <$. 
Specimen 5, 
the same as il¬ 
lustrated in 
PI. XVI, fig. 1. 
Showing ab¬ 
normal dorsal 
bands. (N.del.) 
