40 Bulletin Wisconsin Natural History Society [Vol. 13, No. 1 
kept in the cage with the females and copulations were observed 
between periods of egg-laying. All females died within three 
days after they had ceased to deposit eggs. 
v. SUMMARY 
1. The genus. Ceuthophilus is nocturnal and one species lives 
in caves. 
2. C. latens responds negatively to light and to air currents 
under normal conditions. 
3. Organs for producing and receiving sounds are lacking in 
this species. 
4. There is no superposition of bodies during copulation. 
5. Meeting of the two sexes is accomplished by chance contact; 
not through the senses of sight or hearing. 
6. Sex-discrimination is dependent upon smell and touch. It 
is localized in the antennae or palps as shown by the experiment 
in which the antennae and palps were removed. 
7. There is no response to lights of strong intensity or to strong 
air currents during copulation. 
8. Females kill and eat weak males. 
9. Eggs were laid in the ground of the laboratory cage, deposits 
of two to five eggs taking place at intervals. 
10. Copulation takes place in the intervals between egg-laying. 
11. Males die soon after a series of copulations and females 
in a short time after the completion of egg-laying. 
bibliography 
Blatchley, W. S. 
1902. Orthoptera of Indiana, 27th Ann. Rept. of Geol. and Nat. 
Resources of Indiana, pp. 397-407. 
Chidester, F. E. 
1911. Mating Habits of Four Species of Brachyura. Biol. Bull., 21, 
No. 4, pp. 235-248. 
Lugger, Otto. 
1898. Orthoptera of Minnesota. 3rd Ann. Rept of Enton. of State 
Exp. Station of Univ. of Minn., pp. 249-252. 
Pearse, A. S. 
1909. Observations on Copulation among Crawfishes with Special 
Reference to Sex-Recognition. Amer. Nat., 43, pp. 740-753. 
