1973] 
Carmichael — A raneus 
65 
Graph I. Scatter diagram and estimated regression line for A. trifolium. 
measurements, b = 2.75, a — 15.24, (expected number of spines) — a + 
b X (tibia length). Open circle, adult specimens; closed circle, immature 
specimens; triangles, mean spine counts for given tibia! length. 
