141] LEPIDOPTEROUS LARVAE — FR ACKER 141 



somewhat smaller than the prothorax; front small, wider than high^ 

 reaching about half way to top of head ; labrum moderately emarginate, 

 bearing only the six primary setae on each side ; ocelli six, subequal in 

 size, fifth much closer to fourth than to sixth; secondary setae of epi- 

 cranium numerous but not long. Body cylindrical, scarcely tapering, 

 covered with short, stout, secondary setae; thoracic segments with the 

 verrucae of the Kappa and Pi groups, and sometimes those of Beta and 

 Rho, distinct. Abdomen with Rho, kappa, eta, mu, and Pi forming 

 distinct and separate verrucae; color black, except for several yellow 

 subdorsal maculae on each segment; all setae black. Thoracic legs well 

 developed, prolegs with a mesoseries of biordinal crochets extending 

 more than half way round the planta; anal prolegs similar to ventral. 

 Osmaterium present. 



GLOSSARY 



In the list of words on the following pages several new ones are 

 included but most are words used here in a special sense. Smith's 

 "Glossary of Entomology" and ''The Standard dictionary" have proved 

 most useful in its preparation altho no definitions from either are re- 

 produced entire. 



Adfrontal pieces, n. The narrow areas on the cephalic aspect of 

 the head just laterad of the front. (Fig. 78.) 



Anal prolegs, n. The prolegs of the last abdominal segment. 



Anal segment, n. The tenth abdominal segment. 



Annulet, n. One of the small rings into which a segment is divided 

 by transverse constrictions. 



Armature, n. The arrangement and form of all the setae and 

 processes of the body wall. 



Bigihious, a. With a pair of large rounded dorsal swellings. 



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

 series but are of at least two alternating lengths. (Fig. 106.) 



Biserial, a. Said of crochets when they are arranged in two con- 

 centric rows. See multiserial. 



Bisetose, a. Consisting of or bearing two setae; said of a group, 

 such as Pi, or of a chalaza, pinaculum, etc. 



Chaetotaxy, n. The arrangement of the setae of a particular insect 

 or segment. 



Chalaza, n. A small chitinized projection of cuticula bearing one 

 seta or two to four setae on separate elevated prominences, between 

 papillae and cornicula in size. (Fig. 90.) 



Corniculum, n. A small horn-like process of cuticula, not associ- 

 ated with primary setae. 



