NO. 6 



CATERPILLAR AND BUTTERFLY — SNODGRASS 



17 





Fig. 9. — Examples of larval prolegs and crochets. 



A, Tomatoworm, Protoparce quinquefasciata, a pair of prolegs, anterior. B, 

 Same, a proleg clasping a twig. C, Same, part of planta, ventral. D, Same, 

 mesal surface of planta. E, Tent caterpillar, Malacosoma americanum, section 

 of proleg, showing muscles. F. Tomatoworm, a pair of crochets, anterior; 

 a, articular point on planta (D,a). G, Silkworm, Bombyx mori, a pair of pro- 

 legs, anterior. H, Same, planta more enlarged. I, Diacrissia virginica, planta, 

 ventral. J, Same, abdominal segment and prolegs, anterior. K, Hepialus sp., 

 pair of median prolegs. L, Same, ventral surface of a median proleg showing 

 crochets. M, Same, crochets of an anal proleg, ventral. 



