OF WASHINGTON, VOLUME XVIII, 1016 131 



these areas lies the pleural suture. This pleurum of Hopkins 

 is homologous to the lateral zone of Boving, but the line which 

 corresponds to his pleural suture in the adult is in the cleridand 

 cerambycid larvae a somewhat oblique line, less distinct than the 

 sutures above and below the pleurum or lateral zone. Snod- 

 grass 1 (page 537) has shown that in the nymphs and immature 

 stages, that line is often indistinct, which corresponds to the 

 pleural suture of the adults. This is considered the case in the 

 clerid and cerambycid larvse. 



Thus the principal changes in this paper will be to adopt the 

 term pleurum for Dr. Boving's lateral zone, and for the prominent' 

 larval lines above and below pleurum (which Dr. Hopkins has 

 not named) adopt Wallengreen 2 names of tergopleural 3 and sterno- 

 pleural suture for Dr. Boving's terms antipleural and pleural 

 suture. Dr. Boving's name for hypopleurum (which name has 

 been used as a part of pleurum) will have to be changed and the 

 name postcoxal (PoCx) is here adopted. These are the principal 

 alterations to be made in this paper to bring about a homology 

 of the names and to adopt terms in more general use for areas 

 which are here considered the same. 



Above the pleurum is the tergum, its divisions are called ter- 

 gites; below the pleurum is the sternum, its divisions are called 

 sternites. 



THE ABDOMINAL STRUCTURE. 



The following discussion and figures are based on the anatomy 

 of the cerambycids. Not all the muscles to be found in the seg- 

 ments are illustrated, but the longitudinal muscles between the 

 cunea are here omitted for the sake of clearness. One plate 

 (Plate 9) shows these longitudinal abdominal muscles essentially 

 like those of the clerid. These longitudinal muscles are attached 

 to the posterior edge of one cunea extending to and attaching 

 on the posterior edge of the cunea behind. The longitudinal 

 muscles which extend backward determining folds within the 

 segment, are always attached to the anterior edge of the cunea. 

 Thus the cunea can always be defined by longitudinal muscles. 

 Also the superior cunea can be indicated l>\ iln> two fascia of the 

 muscle s-pn- from the posterior cuneal notch. One fascia of 

 this muscle attaches to the anterior and one to the posterior 

 edge. 



1 Snodgrass, H. K., The Thorax of Insects and the Articulation of the 

 Wings, Proc. I". S. Nat. Mus., Vol. 36, p. 511-595, 1909. 



Wallengreen, H., Physiologisch-Biologische Sludien i':l>er Die Atniunv 

 Bei Den Arthropoden, Lands University s Arssknft, N. I-'., Vol. 10, 191 I 



; Uimmock, Geo., Primer Informc Annul de la Estacion Central Agro- 

 mica de Cuba, 1906. On page 295, canal lateral, lateral furrow. i< u-ed, 

 equivalent to tergo-pleural. 



