236 Annals Entomological Society of America  [Vol. V, 
and a distal piece divided into two regions by the difference in 
coloration. The distal two-thirds is a blade-shaped piece with 
a median ridge bearing seta. This blade-shaped piece is the 
galea and the median ridge is the supposed line of coalescence 
of the galea and lacinia of Comstock and Kellogg. There is 
borne on the lateral margin at the proximal end of the galea a 
two-segmented appendage, the palpifer and a one-segmented 
maxillary palpus. The palpifer is inserted in a furrow in the 
side of the maxilla and can be pushed back against the bottom 
of this furrow so as not to project beyond the lateral margin of 
the maxilla. There is a distinct convexity at the distal end of 
this furrow and an oblique line extends across the maxilla 
from this point, which probably marks the division between the 
galea and the proximal piece of this portion of the maxilla, the 
stipes. The suture between the galea and stipes is obsolete. 
The lacinia is a thin, cuticular lobe attached near the mesal 
margin of the stipes at its distal end. It is not attached at the 
margin of the stipes but a short distance within. The lacinia 
at its distal margin 1s developed into a lobe which rests upon the 
base of the galea. It is so delicate that. where 10, rests 
upon the galea, its distal end appears like a faint, curved, 
transverse suture. The distal end of the lacinia resting upon 
the galea is evidently what Comstock and Kellogg have mis- 
taken for a suture separating the galea into a triangular proxi- 
mal piece and a distal blade-like piece. The lacinia is larger 
and more distinct in the honey bee than in Bombus. It shows 
very distinctly on specimens cleared in caustic potash and 
studied in alcohol. 
The lacinia was found to be present in the maxille of prac- 
tically all the Hymenoptera examined. It is very large and 
distinct in Priocnemis, fully one-third the size of the galea 
which is greatly expanded and consists of two distal lobes. In 
the large carpenter ant, Campanotus, the lacinia is a distinct 
lobe at the proximal end of the galea. Wheeler* considers it as 
present but his figures of the maxille copied from Janet do not 
show it. A species of Andrena also shows it as a lobe similar in 
form and location to that of Bombus and A pis but smaller. The 
only hymenopterous insect examined where the lacinia was 
found to be completely wanting was the short tongued bee, 
*Wheeler, W. M.—Ants, their structure, development, and behavior. New 
York. 1910. P. 19. 
