132 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Starting with an abdominal segment of a Lepturinae larva 

 (Plate 6) the homologies will be pointed out comparing it with a 

 clerid, as illustrated by Boving. 1 First will be noticed a con- 

 siderable reduction both in size and number of the perpendicular 

 muscles, except those between the pleural sutures (tp-sp). This 

 pleurum is strongly protuberant in this form, produced by the 

 numerous short muscle bands from the tergopleural to the sterno- 

 pleural (tp-sp) and postcoxal line [hypopleural line of Boving] 

 (tp-pcx). These tergopleural-sternopleural muscles are absent 

 in clerid forms as well as several fascia of the tergopleural-post- 

 coxal muscles. The tergopleural suture is defined as in the clerid, 

 by two sets of perpendicular muscles extending downward, one 

 from its anterior extremity below spiracle to the posterior cuneal 

 notch (tp-pn), the other from its posterior extremity to the post- 

 coxal suture (tp-pcx). The sternopleural suture (s.p.) defined 

 by three (in the clerid) large muscles, from its middle extending 

 dorsad, is here represented by a single band of several fibres 

 (pasc-sp). These last muscles define the ventral limit of the 

 parascutum (PaSc) and the dorsal limit of the spiracular area 

 (SpA) in the clerid. So do they also in the cerambycid. A 

 longitudinal band of muscles (e-s) attached along a perpendicular 

 median line [the parascutal divisor (e)] on the lower half of the 

 parascutum and upper half of spiracular area extends posteri- 

 orly to the superior cunea. These muscles seem to be of little 

 value as determining any abdominal area. In the cerambycids 

 this parascutal area extends over the back of the larvae around a 

 well defined plate, the scutum (Sc). The parascutum and the 

 notal subdivisions are more or less protuberant forming the 

 ambulatory ampullae. The writer believes the parascutum is 

 nothing more than a portion of the notal areas as will be shown 

 later in the thorax, but since it is of value for descriptive purposes 

 the name should be retained. Of these notal divisions only the 

 scutum (Sc) (or more correctly, the scutal plate) is well defined, 

 first by two lateral sutures, the scutal lines (s.c.) defined by the 

 large muscles (pn-sc), also by two transverse sutures (a.sc and 

 p.sc) connecting the scutal lines, defined by muscles extending 

 from the anterior line to the superior cunea behind the segment 

 and from the posterior line to the superior cunea in front, on the 

 same segment; also muscles from each of these lines extending 

 in the opposite direction. These muscles defining scutum in the 

 cerambycid and clerid cannot be absolutely homologized. In 

 the clerid, prescutum arid postscutellum are defined by muscles 

 s-pn (s-pn? of Cerambycidae) and pscl-hypl. These muscles 



1 1. c., Plates III and IV, figs. 1, 2, 3, 4. 



