116 Dr. H. Scott's Noles on hiohKjy of some inquilines and 



seiited by the iiienibranoiis part, indicated as torn in 

 fig. 4, beneath the palp. Ferris (18, pp. 409, 471-2) re- 

 garded the palp as 3-segniented, therein disagreeing, as 

 he hiinself states, with the descriptions given by some 

 earher writers of the larvae of certain other genera of 

 Nitiduhdae. If I am correct in regarding the palp as 

 4-segmented, this renders necessary a modification of 

 Ganglbauer's general definition of Nitidulid larvae (12, 

 p. 443). 



Labium (Figs. 2 b, 5a).— The apical part of the labium 

 and the one-segmented palpi are shown in fig. 5 A. The 

 apex appears feebly bisinuate, the margin set with very 

 short hairs, and the median part of the surface also f urinshed 

 with hairs. The folds and thickenings in the chitin are 

 indicated by shading. The circular translucent spots on 

 and below the palps resemble hair-follicles, but do not 

 bear hairs in any of the 3 specimens examined. The 

 irregular dotted line at the lower edge of the figure repre- 

 sents torn membrane. Below this are some complex 

 chitinous pieces, not figured because it has not been possible 

 to work them out fully in the material at my disposal : 

 they may belong partly to the hypopharynx, which seems 

 closely united to the labium at its base. Below the palp- 

 bearing part of the labium is a roughly pentagonal 

 chitinised piece (fig. 2 B, m.), its posterior margins darker- 

 pigmented : if this is correctly interjireted as the menium, 

 then the submentmn is membranous and transparent, and 

 I have been unable to trace its boundaries, since colourless 

 membrane extends right back between the stipites and 

 cardines of the maxilla, and between the epicranial plates 

 into the neck. 



Hypopharynx (Fig. 5 b). — This organ requires for its 

 complete elucidation more prolonged study than I have 

 been able to give to it. It is not easily separable from 

 the labium, and I am not certain whether fig. 5 B repre- 

 sents the whole organ, or whether the basal part broke 

 away and remained attached to the inner face of the 

 labium. The most conspicuous feature is the truncated, 

 pigmented, chitinous tooth (fig. 5 b, i.), which, in balsam- 

 preparations of the head with mouth-parts in situ, is 

 seen projecting forward between the molar parts of the' 

 mandibles, reaching nearly as far as the front of these 

 molar parts. Apparently the apex of the hypopharynx 

 diverges considerably from the labium, so that the chitin- 



