NiCHOLLy AND KiciiARDSON — Tii'o N CIV ^^pccics of Aci'otclsa. 139 
ninth steniito. The penis (hg. 1-) is short and strongly setose, but 
presents no marked peculiarities. 
Hcmarks.—Tliis species shows most ahinity with the sub-species 
A. devriesiana var. pempitiata. The telson, though slightly longer 
in the former, has a similar number of symmetrically arranged 
bundles of setae. The differences, however, occurring in the legs, 
the metasternite, and particularly in the arrangement of the sensory 
papillae are, in our opinion, too considerable to permit of this form 
being treated merely as a variety. 
List of Keferences : 
19U4 Escherisch : Das System der Lepismatiden. 
1907 Bilvestri: Die Fauna Sudwcst Australiens, Bantl II, Lief. IV. 
1913 Alexander: Aptera of Australia, Report of xVustralian Ad- 
vancement of Science Meeting. 
4 
Explanation of Plates XVI and XVII. 
Plate XVI. 
1. Dorsal view of Acrotelsa spleiidens (female), antennae and cerci 
abbreviated, 
la. Ventral view of the posterior portion of the abdomen (female), 
showing the ventral styles, ovipositors, etc. 
lb. Ventral view of the posterior portion of the abdomen (male), 
showing the ventral styles, penis, etc. 
2. Dorsal vicAV of the tenth tergite. 
3. Median portion of the metasternite. 
3a. xMedian portion of the mesosteriiite. 
4. Third thoracic leg. 
4a. Portion of the third tarsus and the claws. 
5. The labium. 
(). The maxilla. 
7. The mandible. 
8. Terminal portion of the ventral valve of the ovipositor. 
9. Basal segments of the antenna. 
9a. Typical antennal segments. 
10. Type of body scales. 
Plate XVII. 
11. Dorsal view of Ao'otclsci wcatrutis. 
12. Ventral view of the telson region (male). 
13. Dorsal view of the telson. 
14. Third thoracic leg. 
14a. Portion of the tarsus of the third leg. 
14b. Portion of the tarsus of the second leg. 
