in the Genus Dipseudopsis, Walk. 311 



The lubes of the Jirst pair of mu.cillce are extraordinary. 

 Each is a loTiii; tapering semi-tube, convex on the outside 

 lateral niarp,in, concave on the inside. Along each of the 

 edges which on each side accompany this concavity or 

 channel are a row of peculiar sense-organs — ]ilate-like 

 structures of two sizes, the broad and narrow plutts being 

 for the most part arranged alternately, each carrying a small 

 conical papilla at the end. The sense-organs in the'Lepidoptera 

 figured by Breitenbach * and called " saft bohrer " display 

 a considerable resemblance to these, there being the central 

 ]iart homologous with the hair-shaft, and the outer area or 

 " plate " honn>logons with the outer ring of tlie hair-shaft. 



Each of the pendulous lobes is cross-barred, but the cliitin 

 rings are not perfectly regular, for under a iiigh power they 

 are seen to be broken, to branch, and to anastomose. Between 

 the rings the chitin is clear, membranous, and delicate. Part 

 of the proboscis of Af/raulis juno figured by Breitenbach f 

 bears a strong superficial resemblance to the ringing in the 

 proboscis of Dipsevdopsis. A small ridge or ledge runs 

 along the inside of the walls of the channel. The walls are 

 grooved and are possibly capable of meeting each other and 

 converting each lobe into a tube. A thick chitinous flaj; is 

 situated obliquely across the base of each lobe and impinges 

 on the hypopharyngeal plate. At the base, each lobe above 

 is hidden by long hairs and by a giant sense-organ of the 

 same nature as those on the lobe. 



Comparison icith the Lepidoptera. 



Ulmer at the conclusion of his paper remaiks : '' dass der 

 Eiissel der vSchmetterlinge sowohl seinem Bau wie seiner 

 entstehung nach von dem riisselformigeu Anhang der 

 Tricho[)teren ganzlich verschieden ist." Now the evidence 

 of Micropteryx goes to show that the two elements of the 

 proboscis in tiie Lepidoptera are the homolognes of the outer 

 lobes of the first pair of maxilhe. The lobes in JJipseudopsis 

 are also probably the outer lobes, as I think the densely 

 chitinous mass on the outside of each lobe is probably a 

 prolongation of the gena of the skull. At all events the 

 maxillary palp arises on its inside margin and at the base of 

 the pendulous lube. 



Again, in some Heterocera, such as Zeuzera, Arclia, and 

 others, the two elements of the proboscis are not co-adapted, 



* " Beitrage zur Kenntniss des Baues der Schmetterlings-Riisse'," 

 Jenaische Zeitschrift, Bd. xv. (1881-2). 

 t Loc. cit. Taf. iv. tipr. 9. 



