40 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G4. 



Fig. 33. Imago iiuside capsule formed by the exuviii of fourth and fifth hirval 

 instars. /, imago ; Jf and 5, exuvia of fourth and fifth instars ; 6, 

 the shed and crumbled exuvia of sixtli instar and of the pupa 

 pushed to the bottom of the caps*ule; e, unfertilized ^•ery small eggs 

 abnormally deposited inside unbroken capsule. 



34. Fifth instar, — Lateral vievA^ of head. 



35. Sixth instar. — Lateral view of head. 



Plate 5 

 Eggs of hees and i)ist(irs of Tricrania. 



Fig. 36. Brood cell of Colletes rufithornx Swenk in its natural position in the 

 soil, slightly enlarged. The egg of the bee in its normal position 

 above the food mass is shown through the transparent wall of the 

 brood cell. 



37. First Instar of Tricrania resting on tlie edge of the food mass in the 



brood cell of tlie bee, inunediately preceding tbe first moult. X 10. 



38. Second Instar of Tricrania, resting on tlie food mass in brood cell of 



bee. X 3. 



39. Brood cell of Andrena perplexa Smith showing egg of bee in its normal 



position on the mass of pollen in the bottom of the cell. In this 

 case no honey had yet been placed in the cell about the egg. Slightly 

 enlarged. 



40. Third Instar of Tricrani-a resting on food mass in cell of bee. X 3. 



41. Fourth Instar of Tricrania feeding in brood cell of bee from which the 



wall has been cut away. 



42. Female of Tricrania ovipositing on the under side of a mass of dried 



cow's dung. Enlarged about two diameters. 



o 



