Siphunculata and Hemiptera 
2 75 
HYMENOPTERA 
Adult insect with four, usually transparent, wings, wanting in 
some species. Mouth parts adapted for biting and sucking; palpi 
small; tarsi four or five-segmented. Metamorphosis complete. 
Parasitic four-winged flies, ants, bees, and wasps. 
SIPHUNCULATA AND HEMIPTERA 
a. Legs with claws fitted for clinging to hairs; wings wanting; spiracles of the 
abdomen on the dorsal surface. ( = ANOPLURA = PARASITICA). 
.SIPHUNCULATA. 
b. Legs not modified into clinging hooks; tibia and tarsus very long and 
slender; tibia without thumb-like process; antennae five-segmented 
.H^matomyzid.e Endr. 
Hczmatomyzus elephantis on the elephant, 
bb. Legs modified into clinging hooks; tibia and tarsus usually short and 
stout; tibia with a thumb-like process; head not anteriorly pro¬ 
longed, tube-like. 
c. Body depressed; a pair of stigmata on the mesothorax, and abdominal 
segments three to eight; antennae three to five-segmented, 
d. Eyes large, projecting, distinctly pigmented; pharynx short and 
broad; fulturae (inner skeleton of head) very strong and broad, 
with broad arms; proboscis short, scarcely attaining the thorax. 
.PEDICULIDiE 
e. Antenna; three-segmented. A few species occurring upon old 
world monkeys. Pedicinis Gerv. 
ee. Antennae five -segmented. 
f. All legs stout; thumb-like process of the tibia very long and 
slender, beset with strong spines, fore legs stouter than the 
others; abdomen elongate, segments without lateral pro¬ 
cesses; the divided telson with a conical process posteriorly 
upon the ventral side.Pediculus L. 
g. Upon man, 
h. Each abdominal segment dorsally with from one to three 
more or less regular transverse rows of small setae; 
% antenna about as long as the width of the head. Head 
louse (fig. 65).P. humanus. 
hh. “No transverse rows of abdominal setae; antenna longer 
than the width of the head; species larger.” Piaget. 
Body louse of man.P. corporis. 
gg. Upon apes and other mammals. P. pusitatus (?). 
ff. Fore legs delicate, with very long and slender claws; other legs 
very stout with short and stout claws; thumb-like process of 
the tibia short and stout; abdomen very short and broad; 
segment one to five closely crowded, thus the stigmata of seg¬ 
ments three to five apparently lying in one segment; segments 
five to eight with lateral processes; telson without lateral 
conical appendages (fig. 69). Crab louse of man . 
.Phthirus pubis. 
