292 



He disfinguishes two types: 1". Hepinlus. „This type eonsists 

 (abdom. segm.) of five tubercles above the spiracle on each side, 

 three in a transverse row about the middle of the segment and 

 two behind, bekiw the spiracle are two oblique rows, containing 

 respectively two and four tubercles (l.c. fig. 2 p. 197. See PI. X, fig. 4). 

 2". The second type contains two dissimilar lines of modification 

 of the first type. The fimdamental arrangement is as foUows : On 

 each side above the spiracle three tubercles, below or behind the 

 spiracle and above the base of the leg three more, on the base 

 of the leg three (or four) on the outside and one on the 

 inside near the midventral line. I propose to designate thus, 

 counting from the dorsal line down the side : Tubercles I, II, III 

 above the spiracle, IV, V, VI below it, the group of three on the 

 outside of the leg as VII and the single one on the inside of the 

 leg as VIII. VII and VIII are also present on the legless abdo- 

 minal segments in the corresponding position" (1. c. p. 196 — 197, 

 fig. 5, p. 198. See PI. X, fig. 5). 



In the Psychidae the three tubercles are retained on the middle 

 annulet, while both are lost on the posterior one (1. c. p. 198, 

 fig. 3). See PI. X, fig. 6. 



Other deviations also occur so that he separates the Pf^ijchidae 

 from all the rest of the Frenatae. 



The thoracic segments difïer a great deal, the /a+ b and Ila. 

 + b occurring there, are not homologous with the abdominal Zand 

 II but they are simply called thus, because there often occur 

 two tubercles, one above the other, each hearing two setae. 



In 1901 Dyar came to different conclusions, especially through 

 O. Hofmann's criticism. He accepted Hofmann's opinion about 

 tlie homology of the thoracic setae. 



O. HoFMANN (1898) found that in the Pferophon'dae the ])yoÜ\o- 

 rax deviates strongly from the rest. During instar / the meso- 

 thorax and the metathorax bear six setae and so does the abdomen. 

 They are homologous but not in the way Dyar thought. A better 

 homology runs thus : 



