iS94.] 
123 
[Packard. 
Fig. 8. Maxilla of Dixa ; 
Ip, labial palpi (?) or eud of 
labium. — After Meinert. 
apparently two-jointed." 
illae of the Mycetophilidae as pro- 
vided "with a large coriaceous inner 
lobe, and a horny outside piece, 
with a circular excision at the tip." 
The inside piece (galea) is dentate 
on the inner edge. On the outer 
lobe in Sciara is what Osten Sacken 
describes as "a small fleshy tuber- 
cle," and which "is evidently a rudi- 
mentary maxillary palpus." The 
palpus is best developed in Scio- 
phila, "where it is subuliform and 
It thus appears that the maxillary 
palpi are better developed in Dixa and Simulium than in any 
other dipterous larvae. There seems, then, to be no special 
resemblance between the maxillae of siphonajjterous and dip- 
terous larvae. 
It thus appears that in those dipterous larvae with the most 
generalized mouth-parts, the galea, lacinia, and palpus Avith its 
palparium are well developed ; hence they are on nearly the 
same plane as the Neuroptera. 
The labium or 2d max- 
illae of the larval Diptera 
eucephala are described 
by Meinert as being al- 
ways without palpi, and 
as existing in the form 
of a very corneous i)late 
toothed on the anteiior 
edge. In Culex the 
labium is broad, triangu- 
lar, with numerous fine 
teeth. In Chironoraus 
the teeth are few and 
large. In the larva of 
Pulex cants the labium 
is very minute, much re- ^^•^•- ^- Mouth-parts of Simulium; sp, 
A,,^^A 1+1 1 T Ti spinneret; sd, salivary ducts ; o, outer, /, 
duced, and though I did . , , ' .^f ' 
,° inner lobe of maxilla ; nixp, maxillary 
not work out its actual palpus : r, rotating organ of mandible (mrZ) ; 
shape, especially its base, ant, bristle-like antenna.— After Meinert. 
sp.-. 
