\\4 Dr. ]]. 8et)it*s Notes on biology of some iiKpriUnes and 



number of other Coleopterous larvae: e.g. the slender, 

 movably articulated, tooth (" prostheca ") in the mandible 

 of Dascillus cervinns (5, ]). 382, pi. 36); the articulated 

 comb-like process in that of Helodes minvta (5, p. 378, 

 ])1. 35); the "lacinia mobilis " in that of Odithebius and 

 Ilydfoscafha (3, pi. 18, figs. 9-12); the broad, thin, per- 

 lucid " retinaculum " in the mandible of the Coccinellid 

 Hypemspis biiiokda (4, p. 624, pi. 118, fig. 6); other 

 examples doubtli'ss could be cited. 



Maxillae (Figs. 2 b, 4). — The lower parts of tlie maxillae 

 and labium are so imbedded in, and continuous with, a 

 transparent membrane, that it is not easy to delimit the 

 parts exactly, and the boundarii^s are therefore sometimes 

 represented in the figures by dotted lines. 



The cardo (figs. 2 b, 4, c.) appears detached from the 

 stipes in the figure, owing to the stretching of the mem- 

 brane. On the inner side the limits between pigmented 

 chitin and colourless membrane are not clearly marked. 

 There is a longitudinal fold or thickening, and the posterior 

 extremity apparently articulates with the tentorium (in 

 fig. 2 B it appears to meet the margin of the epicranium, 

 but is really at a deeper level, and is viewed through 

 membrane). 



The stipes is a large piece, passing gradually into mem- 

 brane on the outer side ; on the inner side there is at the 

 base a projecting flange (fig. 4, /.), the flanges of tlie two 

 maxillae nearly meeting in the middle line. The apical 

 part of the stipes, from Avhich the lobes and palp arise, 

 IS membranous (lig. 4, me.) and transparent, and this part 

 is sharply demarcated from the chitinised part, as shown 

 in the figure ; the membrane below the base of the palp 

 is somewhat torn in the figured example, as is indicated by 

 the dotted line. The dorsal surface of the stipes, between 

 the bases of the lobes and the palp, bears spines and hairs, 

 which, excepting those projecting beyond the outline 

 between galea and palp, are not indicated in fig. 4. The 

 apex of the larger lobe {galea) is set with ranks of processes, 

 one behind the other, their apices blunt, bifid, and sUghtly 

 curved over. The smaller lobe (lacinia) is presumably 

 represented by the darker-pigmented, 3-fingered process 

 (fig. 4, la.), which a])])ears to be slightly curved round the 

 lower edge of the galea. Its representation in fig. 4 is 

 complicated by the presence of a mmiber of spines (one of 

 which is blunt and almost spatulate) on the dorsal side of 



