98 
Psyche 
[June 
still as slender and subcylindrical as are those of most of the 
young larvse. I have found, however, a few of the size of 
mature worker larvse, which differ from the latter only in 
being stouter, and these I have described above as “im- 
mature sexual (?)” forms. 
If this tentative conclusion should be substantiated in the 
future, Allomerus larvse may prove useful in studying the 
problem of the differentiation of castes. 
Explanation of Plates 
Plate 7. 
Worker larva of Allomerus octoarticulatus var. demerarse. 
Fig. 1. Mature worker larva, in side view. X34. 
Fig. 2. Young larva, side view. X34. 
Fig. 3. Semipupa, side view. Hairs omitted. X34. 
Fig. 4. Distal maxillary sense-organ, in profile. X550. 
Fig. 5. Proximal maxillary sense-organ, surface view. X550. 
Fig. 6. Mandible, dorsal view. X275. 
Fig. 7. Hypopharynx, dorsal view. X275. 
Fig. 8. Head, dorsal view. X190. 
Fig. 9. Labrum, ventral view. X275. 
Figs. 10-12 and 18-22. Type 4 body-hairs. X275. 
Figs. 13 and 14. Type 2 body-hairs.. X275. 
Fig. 15. Type 4 body-hair, apical aspect. X550. 
Fig. 16. Type 1 body-hair. X275. 
Fig. 17. Type 3 body-hair. X275. 
Plate 8. 
Sexual larva of Allomerus octoarticulatus var. demerarse. 
Fig. 1. Type III body-hair. X275. 
Fig. 2. Type II body-hair. X275. 
Fig. 3. Type IV body-hair. X275. 
Fig. 4. Young (half-grown?) sexual larva, side view. X34. 
Fig. 5. Type I body-hair. X275. 
Fig. 6. Young sexual larva before molting to definitive sexual 
form, side view X34. 
Fig. 7. Mature sexual larva (H) compared in size with mature 
worker larva (B) , side view. Outlines only. X10. 
