NOVEMBER, 1905. SOME OBSERVATIONS ON PARASITIC BEES. 
167 
of the larva of the host-bee Alcidamea producta, and the aggres- 
sive tendency of the larva of the parasitic bee Stelis sexmaculata. 
Fig. 1. Diagrammatic longitudinal section through a cell in 
the nest of Alcidamea producta Cress, 
a. Egg of Alcidamea. b. Egg of parasite Stelis. 
Fig. 2. Mandible larva of Alcidamea producta Cress. 
Fig. 3. Mandible of larva of parasite Stelis sexmaculata 
Ashm. 
Fig. 4. Diagrammatic longitudinal section through lower 
half of a cell of Megachile latimanus Say. 
a. Egg of Megachile. b. Egg of parasite CdeeUowys. 
Fig. 5. Head of larva of parasite Ccelioxys rufitarsis Sm., 
before 1st moult. 
Fig. 7. Larva of parasite Triepeolus helianthi Rob., before 
Fig. 7. Larva of parasite Triepeolus helianthi, Rob., before 
1st moult. 
- Fig. 8. The same several days after 1st moult. 
