126 
Psyche 
[December 
of straight smooth setae, two blunt “olfactory” setae and 
six small straight truncate to slightly clavate setae, (see 
Plate 11, fig. 2) which are less than half as long as the 
normal pointed setae. Third antennal segment with three 
transverse rows of smooth pointed setae. Third antennal 
segment with two short roughly boot-shaped pegs, situated 
in deep integumentary folds, protected on either side by 
a blunt seta, similar to those on the fourth antennal seg- 
ment. Antennal segments one and two each with a single 
irregular transverse row of smooth pointed setae. 
Mandibles with well-developed molar plate and four to 
five blunt apical teeth. Maxillae with four heavy teeth and 
a number of thin lamellae of varying sizes, the largest 
two being deeply serrate on their inner edges. Post-anten- 
nal organ (P.A.O.) located in a shallow triangular depres- 
sion and consisting of three or four lobes situated around 
a roughly hemispherical central boss. The two anterior 
lobes are in transverse line and the one or two posterior 
lobes diagonal to this. Small accessory boss present just 
below and behind the P.A.O. Head clothing as in figure. 
First thoracic segment somewhat reduced, possessing 
only a single transverse row of four setae. The outer two 
setae are long and ciliate ; the dorsal pair are short, 
smooth, curved, and very thick. Second thoracic segment 
with three irregular transverse rows of setae. The an- 
terior row somewhat diagonal in position. Third thoracic 
Explanation of Plate 10 
Figs. 1-11. Schaefferia variabilis, n. sp. 1. Head, lateral view (holo- 
type) . 2. Left fourth antennal segment, dorsal view (holotype) . 3. Left 
anal horn and adjacent abdominal area, lateral view (paratype) . 
4. Left dens and mucro, from right side (paratype) . 5. Left eyes and 
P.A.O., from above (paratype) . 6. Sensory pegs of third antennal seg- 
ments, showing variation in form. 7. P.A.O. and anterior eye, showing 
abnormal double accessory boss (paratype) . 8. P.A.O. and anterior 
eye, seen from side of organ (paratype). 9. Single large thoracic seta. 
10. Genital plate, male (one-half of setae shown) (paratype) . 11. Third 
antennal segment, sensory organ. 
Figs. 12-14. Pseudanurophorus arctica, n. sp. 12. Right half of fifth 
and sixth abdominal segments, dorsal view (holotype) . 13. Left P.A.O. 
and antenna base, dorsal view (paratype) . 14. Third antennal segment 
(setae omitted) , showing apical sensory organ, dorsal view (paratype) . 
