516 Scientific Proceedings, Royal Dublin Society. 



a very high-power magnification this portion is seen to be provided with 

 numerous slightly elevated papillae, from which there arise very minute 

 hairs. No doubt, these are taste organs, and possibly sensory with regard to 

 touch. These papillae extend inwardly on the dorsal face, and are present on 

 two somewhat raised lateral areas or lobes, where, moreover, their hairs are 

 lono-er. From their position and structure these lobes may represent 

 maxillulae, which have already been described as occurring in many species 

 of coleopterous larvae. A chitinous band extends at each side of the 

 hypopharynx, and posteriorly forms a point of attachment for muscles for the 

 movement of that organ. 



(iiij Thorax (PL XVI, figs. 12 and 13). — The prothorax is the smallest 

 segment, the mesothorax larger, and the metathorax largest. The pronotal 

 shield is not strongly chitinised, and not distinct, undivided dorsally, but 

 prescutal and scuto-scutellar areas indicated by two transverse rows of 

 bristles ; the shield has a distinct mid-dorsal suture, on each side of which 

 three bristles occur in each of the two transverse rows. One row is placed just 

 anterior to the posterior margin of the pronotum, while the second series of 

 bristles arises towards the front margin. The last bristle in each series occupies 

 a position on the raised lateral margin, which corresponds to the alar lobe.' 

 This area further carries another small bristle which arises in front of the 

 anterior series. Ventral to the alar lobe and towards the front margin a single 

 bristle occurs on a small pigmented plate in the cuticle. 



The mesothoracic and metathoracic tergites are divided into two distinct 

 areas, the anterior one representing the prescutum and the posterior the 

 scuto-scutellum. The mesothorax, when a cleared and stained larval cuticle is 

 examined, shows many and variously shaped, granular-structural plates, from 

 which arise the brown tipped bristles. These areas are present in a certain 

 definite order on all the segments of the body, but in the case of the pronotum 

 and ninth abdominal tergum fusion has taken place in the modification of 

 these parts for particular purposes. They are analogous to the oftentimes 

 very prominent and pigmented areas present on the segments of larvae of 

 many other Chrysomelidae, e.g. Phyllotrda nemorum. 



In L. parviUus larvae tliey are not conspicuous when living specimens are 

 examined ; in fact, if the larva has recently moulted, they are often difficult 

 of determination, even in cleared and stained preparations. Those occurring 

 laterally, however, appear (especially in young specimens) as prominent 

 lobes on the pleural region of the abdominal segments one to eight. The 



' The terminology used is adapted from Bovinf; and Champlain : Larvae of North 

 American Beetles of the family Cleridae. Proc. U. S. Nat. Mus., 57 (1920), pp. 575-649. 



