132 
Psyche 
[December 
Mandible with well-developed basal molar plate, well 
separated from the four or five apical teeth. Mandible 
externally with a darkened swelling opposite the apical end 
of the molar plate. Maxilla with two heavy teeth and 
three thin lamellate plates, serrate on their inner edges. 
The outer two plates are apparently double at their inner 
border, and the more dorsal of these plates extends well 
beyond the rest of the maxilla and ends in two very large 
serrations. 
P.A.O. situated in a shallow depression on the side of the 
head near the base of the antenna. It is an oval, swollen 
lobe, about two-thirds as wide as long, and with long axis 
roughly perpendicular to the long axis of body. 
Dorsum of first thoracic segment greatly reduced, lack- 
ing setae. Legs without tenent hairs, unguis simple, acu- 
minate, without teeth. Unguiculus pointed, less than half 
as long as unguis, sides parallel for basal third of its 
length, then converging directly for apical two-thirds, 
with the inner side being the more strongly deflected. 
Abdominal segments five and six distinctly separated, 
but with a narrow intersegmental membrane. Furcula and 
tenaculum lacking. End of abdomen rounded, lacking anal 
spines or papillae. Anus ventrally directed. 
Variation 
The sensory setae of the fourth antennal segment differ 
only slightly from the normal clothing setae, and vary 
considerably in number and position. There may be as 
few as eight or as many as thirteen, with ten the usual 
number; of these a few are ventral in position (from none 
to three), the remainder dorsal. 
Explanation of Plate 11 
Fig. 1. Pseudanurophorus arctica, n. sp., dorsum of right fourth 
antennal segment (paratype) . Fig. 2. Schaefferia variabilis, n. sp., apex 
of ventral surface of fourth antennal segment (paratype) . Figs. 3-5. 
Pseudanurophorus arctica, n. sp. 3. Habitus (paratype) . 4. Left antennal 
base and P.A.O. , dorsal view (paratype) . 5. Right hind foot (paratype) . 
Figs. 6-7. Schaefferia variabilis, n. sp. 6. Right hind foot (paratype) . 
7. Habitus (setae omitted) (paratype) . 
