66 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
advance sheets from Guerin. We do not know if these sheets were really mere 
advance sheets, or whether Guerin has published the text of the Iconographie in instal- 
ments as he did with the plates. However that may be, priority of publication for 
Dermatophilus is established by the fact that the name is dealt with in 1839 by Lucas 
in Guerin, Diet. Pitt. Hist. Nat. VIII. p. 394, Lucas spelling the name Dermatopbylus. 
There are two species of Dermatophilus, which present the following generic 
characters : — 
Frons angulate, the angle prominent and rather close to the frontal oral 
corner ; a horseshoe-shaped depression behind the angle. No internal incrassation 
of the skeleton from the base of the antennal groove upwards to the mesial line of 
the head. Antennal groove closed behind by the prosternite. The two frontal 
bristles found in the preceding genera much reduced or absent. Occipital bristles 
minute. Eye situated at the antennal groove, or at a short distance from it. 
Second antennal segment with one or several long but thin bristles on the apical 
projection. Club ot antenna on non-segmented side with a row of from two to four 
hairs, or without hairs. 
Thoracical tergites very short, the occiput almost touching the abdomen. Meso- 
sternite produced posteriorly into a small obtuse lobe, the corresponding lobe of the 
prosternite vestigial. One minute hair on the metathoracic sternum, no hair on 
the episternum ; epimerum very large, reaching to the third abdominal segment. 
Abdominal tergites one to seven with one bristle, which is lateral, standing above 
the stigma ; abdomen of pregnant globular, membrane between third and fourth 
segment enormously extended, the three proximal segments pushed forward, the 
other segments backwards. Sensory plate of ninth tergite with a patch of eight 
grooves on each side. 
Mid coxa ovate. Posterior ( = meral) portion of hind coxa excised apically; 
apex of hind coxa anteriorly produced downwards into a prominent lobe. Trochanter 
and femur of hind leg simple. No hairs at the vestigial subbasal sinus of the hind 
femur ; curved apical bristle of femora weak. Tarsi very slender, bristles very long 
and thin ; first segment of mid tarsus very little shorter than second. Claw very 
slender, without basal projection. 
$. Eighth abdominal tergite without manubrium ; eighth sternite very large, 
divided on each side by a very deep and narrow sinus as in Hectopsylla. Manubrium 
of clasper longitudinal in direction. Clasper almost completely separated from the 
dorsal portion of the segment ; two processes, forming a pair of pincers, the upper 
one not separated from the clasper, the third (uppermost) process of the other Sar- 
copsyllids completely lost. Ninth sternite broad, internal vertical portion vestigial. 
Stylet absent. Segments two and three ot abdomen without stigmata- 
Pregnant $ within the skin of the host. 
The genus is American, D. penetrans having spread into the Aethiopian region. 
