OF WASHINGTON, VOLUME XVIII, 1916 133 



have dropped further down in these forms and do not produce a 

 fold defining these areas. Hence the region in front of scutum 

 which is considered prescutum and that just behind scutum 

 which is considered scutellum, are both indistinct. The post- 

 scutellum is wanting. 



Anteriorly beneath the sternopleural suture is a small triangle 

 PrSt, which is considered the presternum. In most cerambycids 

 it is formed more by the ampullar protuberance than by special 

 muscles, and by this same protuberance crowded to the side, 

 but in the thorax the ventral extremities often meet or fuse. 

 In one subfamily, the Aseminte, it is definied by a muscle ps-i 

 [represented in the Cerambyciriae figure (Plate 8)] and in the 

 clerid and many other Coleoptera, it is well defined by two mus- 

 cles dpl-s and dpl-i (of Boving) one extending to the superior 

 and one to the inferior cunea. In the clerid the deuteropleurite 

 and presternum are considered as fused together. Behind the 

 presternum and below the sterno pleural suture lies the post- 

 coxal area (PoCx), limited below by the postcoxal line which is 

 defined by (Boving's hypopleurum) perpendicular muscles 

 (tp-pcx) (anti-hypl) of Boving) from the postcoxal line (p.cx) 

 to the posterior end of the tergopleural suture; and I may add 

 this postcoxal line is (in the cerambycids) also defined by one or 

 several muscles (s-pcx) to the superior cunea (probably hypl-tepl 

 of the clerid.} This postcoxal area is usually more or less trian- 

 gular in shape. Beneath the postcoxal area lies the coxal lobo 

 (CxL). This is a conspicuous area in some cerambycid larvae, 

 lying between the postcoxal and sternal lines. It can always be 

 determined by two points of muscular attachments. One on the 

 sternal line having two or three muscles (tp-si) to the tergo- 

 pleural suture, the posterior of which represents Boving's pscl- 

 hypl; the other point is on the postcoxal line defined by the 

 muscles tp-pcx (clerid muscles a,nti-hypl). From the position of 

 these muscles in the clerid, figure 4, it will be seen that the coxal 

 lobe is inconspicuous, the muscle almost lying on the same line, 

 nevertheless a very small triangle can be seen on the larvae. This 

 is almost the case in the Cerambyciriae. 



In the clerid just beneath the postcoxal and coxal areas lies 

 the parasternum. The broken line ventrally limiting it is con- 

 sidered the sternal line defined by muscles s-st and cm-st. This 

 area is not present in the cerambycids and only the posterior 

 part of the line defined by muscles pn-st (an-st of the clerid) is 

 considered as really the sternal line. The other muscles s-st of 

 the clerid are only present in Leptura forms (s-st). Their posi- 

 tion in these larvae and in many other Coleoptera is so variable 

 that for the present their significance cannot be determined. 

 However in the clerid, elaterid and trogositid they define an 



