June, 1916.] 



Forbes : Caterpillar Homologies. 



141 



Apatelodes, and other Eupterotidje, has well marked, though small 

 warts, as also I believe have a few primitive exotic Lasiocampidae; 

 they differ so far as I know from practically all the following fami- 

 lies by their abundant and conspicuous secondary hair. They really 

 come very close to the Bombycida;, which also have warts dominated 

 by secondary hair, and widespread prolegs, with regular biordinal 

 hooks, but in the familiar B. niori at least the hair is much more 

 reduced. 



Sthenopis shows the characters of the Hepialidse as given by 

 Fracker. 



I believe that the true Heliodinidje (c. g., Lithariaptcryx) are re- 



Fig. I. Lateral and dorsal muscles of larva of Hepialus htimuli. The 

 drawing is from a prepared skin and to be trusted only for what it shows. 

 The muscles are labelled according to Lyonet's system, the tubercles according 

 to what I believe to be their homologies. The drawing is mainly from the 

 fourth abdominal segment. Note presence of S and T, migration forward, 

 rather than back, of lower dorsal longitudinal fibers, and position of upper 

 ends of m and q, intermediate insertion of beta, and lower end of uppermost 

 fiber of alpha, subv. f. Subventral fold — marked by the broken line. sp. 

 Spiracle, viii is seen by transparency. 



lated more or less closely to the Yponomeutidae, while the Heliozelidae 

 (Antispila and Coptodisca) are much more primitive forms on an- 

 other line, connecting perhaps with the Elachistidje. Their larval 



