EXTERNAL ANATOMY OF THE HONEY BEE 1 (2) 



1. With fine forceps, carefully remove the left prothoracic leg, being 

 sure that you secure all the joints. Mount and examine it with the dis- 

 secting microscope and also with the low power of the compound micro- 

 scope. Note that it is composed of five joints which, beginning with the 

 one attached to the body, are designated as follows : (a) coxa ; (6) tro- 

 chanter ; (c) femur ; (d) tibia, and (e) the five-jointed tarsus. Note : 

 (/) the feathery branched hairs, for gathering pollen, which are present 

 on all the joints except the tarsus ; (g) the pollen brush and (h) the 

 flattened spine (velum) on the tibia ; (£) the circular antenna comb on 

 the first joint (basitarsus) of the tarsus, which works with the velum on 

 the tibia to form an antenna cleaner ; (J) the eye brush, also on the 

 first joint of the tarsus, and (k) the foot, or terminal portion of the tarsus, 

 which consists of a fleshy adhesive pad (pulvillus) and a pair of notched 

 claws. Draw to show the structures observed. 



2. Remove, mount, and study as before, the left mesothoracic leg. 

 Observe the pollen spur on the tibia, which is used to dislodge the pollen 

 pellets from the pollen basket on the tibia of the metathoracic leg. Draw 

 a portion of the leg to show this structure. 



3. Remove, mount, and study as before the left metathoracic leg. 

 Note : (a) the concavity (pollen basket) on the outer surface of the 

 tibia ; (b) the row of short, stiff spines (pecten) present on the distal end 

 of the tibia ; (c) a concave plate (auricle) on the inner surface of the 

 first joint of the tarsus ; and (d) the pollen combs, on the first joint of 

 the tarsus. Draw a portion of the leg to show these structures. 



4. For comparison, examine a number of other common species of 

 Insects, such, for example, as the primitive Silver-fish (Lepisma), Dragon- 

 fly (Libellula), Giant Water-bug (Benacus), House-fly {Musca), Mosquito 

 (Culex), Flea (Pulex), Stag Beetle (Passalus), and the large Black Ant 



(Camponotus). 



» B. pp. 123-128. 



301 



