
No. 429.] THE MOUTH PARTS OF INSECTS. 697 
dermal modifications and outgrowths which for simple demands 
of space become far removed from the larval mouth parts, the 
bases of the developing imaginal parts lying, indeed, in late 
larval life in the first thoracic larval seg- 
ment. But in earlier larval life the begin- 
ning imaginal parts lie almost wholly 
within the larval parts, and no one study- 
ing the series of whole head preparations 
and of sections can fail to be convinced 
of the certain correspondence and homol- 
ogy between larval and imaginal parts, 
although there may be said to be no perfect 
transformation or development of the one 
into the other, the evidence being that of a 
correspondence in position on the head and of part for part. 
Apis mellifica (Figs. 16—18). — The beautiful series of cleared 
and stained heads of honeybee larve of different ages, and the 
series of sections of similar heads pre- 
pared by Mr. Spaulding, show a condition 
in the development of the imaginal mouth 
parts of the bee wholly identical with 
that just shown for the digger wasp. 
The larval mouth parts (Fig. 16) are very 
weakly chitinized, but are complete and 
readily distinguishable. They resemble 
in general the mouth parts of the digger 
wasp larva, but are smaller, weaker, and 
the short fleshy maxilla bears only the 
minute one-segmented palpus, having no 
tiny lobe as in the wasp maxilla. The p. ee oe sak 
imaginal mouth parts (Fig. 17) of the bee, honeybee, Apis mellifica. md., 
familiar to all entomologists, are com- maxillary palpus: dpi 
posed of horny, trowel-like mandibles 1277 lobe; st., stipes; cd., cardo; 
(md.), long maxillae (mx.) with cardo (cd), m., mentum; Ag. paraglossa ; 
stipes (s/.), small one-segmented palpus  *^9**: 4, bi palpus. 
(mx.p.), and with galea and lacinia fused to form a single 
flattened, pointed, bladelike terminal lobe (mzx./.), and of 
labium (/.) with long, tapering subcylindrical ligula formed 

la 
bium; Z., labial palpus. 

