143] LEPIDOPTEROUS LARVAE — FR ACKER 143 ' 



Primary seta, n. A seta found on generalized larvae in all instars. 

 When contrasted with "secondary setae" this term also applies to the 

 few subprimary setae. 



Proleg, n. A fleshy abdominal leg, said to be present when crochets 

 are present even when there is no fleshy swelling. 



Pseudocircle, n. An arrangement of crochets consisting of a well 

 developed mesoseries and a row of small hooks on the lateral aspect of 

 the proleg. (Fig. 97.) 



Scolus, n. A spinose projection of the body wall, as in saturnian 

 larvae. (Figs. 73, 74.) 



Secondary setae, pi. n. Numerous setae having a general distribu- 

 tion and not limited to verrucae or other forms of tubercle. See page 23. 

 Seta, n. A chitinized, hair-like projection of cuticula arising from 

 a single trichogeu cell and surrounded at the base by a small cuticular 

 ring. 



Setiferous, a. Bearing one to many setae. 



Shield, n. A chitinized plate covering the greater part of the dor- 

 sal half of a segment. 



Sphingiform, a. Of the form of a sphingid caterpillar, having a 

 cylindrical body, with setae very short or wanting and no other arma- 

 ture except a mediodorsal horn on the eighth abdominal segment. 

 Spinule, n. One of the short lateral branches of a scolus. 

 Stemapoda, pi. n. Elongated modifications of the anal prolegs in 

 certain notodontid larvae. 



Siibprimary seta, n. A seta having a definite position in certain 

 larvae but not present in the first instar of generalized groups. See 

 Part One. For list of such setae, see pages 39, 40. 



Suranal plate, n. A rather heavily chitinized area on the dorsum 

 of the last abdominal segment. (Fig. 84.) 



Triordinal, a. Said of crochets when they are of a single row but 

 of three alternating lengths. (Fig. 98.) 



Trisetose, a. Consisting of or bearing three setae ; compare bisetose. 

 Tuft, n. A group of setae arising from a verruca. 

 Uniordinal, a. Said of crochets when they are arranged in a single 

 row and are of a single length throughout or shorter toward the ends of 

 the row; opposed to biordiual. (Figs. 101, 105.) 



Uniserial, a. Said of crochets when they are arranged in a single 

 row or series with their bases in line. (Figs. 101, 105, etc.) 



Unisetose, a. Consisting of or bearing a single seta; compare bise- 

 tose. 



Ventral prolegs, pi. n. Those prolegs ordinarily borne on segments 

 3, 4, 5, and 6 ; opposed to anal prolegs ; bookless prolegs are sometimes 

 also borne on segments 2 and 7 and these are also kno^vn as ventral. 



