140 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



gized with those of the other thoracic segments, and are lettered 

 similarly. One muscle sc-cx-st from the lower limit of scutum 

 to the ventral point of coxa has not been found in the prothorax. 

 Anteriorly beneath the pleurum the presternum (PrSt) has 

 become very large and extends entirely across the sternum. In 

 Lepturinae it still consists of two lobes. Behind it and between 

 the coxa lies the triangular eusternum. The anterior curved 

 suture is defined by muscles (e-c) to the collar. 



In the Cerambycinae some trouble may be experienced in ho- 

 mologizing the prothoracic areas below the alar area. As noted 

 before the pleurum and presternum are partly fused in the meso 

 and metathorax. This same fusion is evident anteriorly in the 

 prothorax but posteriorly the pleural suture is usually impressed. 

 (In some forms it is entirely absent or in others entirely present) . 

 The postcoxal area and small coxa have both been crowded 

 back fusing with sternellum to form a narrow transverse fold. 

 The point marked .r on the sternopleural suture in the Prioninse 

 projects in an appodeme. Just above it extends two muscles 

 to the pronotum and from it extends the muscle to the trochanter. 

 At the inner point of the coxal lobe (xx) is a smaller appodeme. 

 These two appodemes have become much extended and meet 

 in a fine ligament inclined posteriorly over the coxa. Above this 

 superior appodeme (x) extends the two muscles to protergum 

 and from it the muscle to the leg, from the connecting ligament, 

 extends the muscles p-i back to inferior cunea. In this sub- 

 family the proeusternum is rarely distinct. 



The other subfamilies of the cerambycids, Aseminae, Lamiinae 

 and Disteniinae can be easily homologized from the types which 

 have been described. 



TECHNIC 



In dissecting the muscles of these larvae the most essential 

 factor is to be certain of the attachment of each muscle in re- 

 lation to the others. Ordinarily pickled larvae are so contracted 

 that this is difficult. A number of methods of preservation were 

 tried but by far the most satisfactory found was to inject the 

 living larva? with absolute alcohol. This distends the specimen, 

 and (except in prepupal larvae) disintegrates the fat, also preserves 

 the muscle in a tough, elastic condition. The alcohol is injected 

 through the anus into the body cavity with a small hypodermic 

 syringe. The pressure created inside closes the puncture when 

 the needle is withdrawn. Specimens killed in boiling water 

 plus a few drops of acetic acid, then injected with equal parts of 

 4 per cent formalin and 95 per cent alcohol, give good material 

 from which the muscles can all be readily removed and the skin 



