270 ENTOMOLOGY 
twisted or branched (Figs. 262, 89) to hold the pollen, do not 
occur on other than pollen-gathering species of insects. Cau- 
dell found that out of 200 species of Hymenoptera only 23 
species had branched hairs and that these species belonged 
without exception to the pollen-gathering group Anthophila, 
PIG. 2202 
we wsity 
IT 
ith 
Adaptive modifications of the legs of the worker honey bee. A, outer aspect of 
left hind leg; B, portion of left middle leg; C, inner aspect of tibio-tarsal region of 
left hind leg; D, tibio-tarsal region of left fore leg; a, antenna comb; b, brush; c, 
coxa; co, corbiculum; f, femur; pc, pollen combs; s, spur; sp, spines; ss, spines; f, 
trochanter; ti, tibia; 7, velum; w, wax pincers; 7-5, tarsal segments; 7, metatarsus, 
or planta. 
no representative of which was found without such hairs. 
Similar branched hairs occur also on the flower-frequenting 
Bombyliudee and Syrphide. 
The most extensive modifications in relation to flowers are 
found in Pronuba, as already described, and above all in 
Apidz, especially the honey bee. 
Honey Bee.—The thorax and abdomen and the bases of the 
legs are clothed with flexible branching hairs (Fig. 262), 
