2a2 Annals Entomological Society of America  [Vol. V, 
or locust, a somewhat similar condition is found. The cardo, 
however, consists of a single piece which bears at its distal end 
an irregular-shaped stipes. The stipes bears at its distal end on 
the mesal side a quadrangular-shaped sclerite, which from its 
position must be the lacinia. There is borne on the lateral part 
of the distal portion of the stipes a two-lobed piece, the galea, 
which consists of a larger outer and a smaller inner lobe. The 
suture dividing the galea into two pieces is obsolete. Although 
not demonstrable, it is quite likely that the small mesal lobe of 
the galea is derived from the proximal sclerite of the galea and 
the large lateral lobe from the distal sclerite of the galea. The 
palpifer and maxillary palpus occupy corresponding positions 
to these sclerites in the cockroach. The maxilla of Macroxyela 
is short and broad and retains many of the general features and 
appearances of the maxillz of the cockroach and locust. 
The maxilla of Dolerus unicolor (Fig. 4), another tenthredi- 
nid, differs from that of Macroxyela in that it shows some of the 
tendencies so characteristic of the maxille of the higher Hymen- 
optera, an elongation and narrowing of the parts. This is 
especially marked in the cardo of Dolerus. The maxilla of 
Dolerus also has three lobes at the distal end. The rounded 
setaceous lateral portion is the homologue of the large lateral 
lobe of the galea of Macroxyela, while the mesal and proximal 
rounded lobe is the homologue of the small mesal lobe of the 
galea of Macroxyela. The lacinia is a long, pointed lobe pro- 
jecting beyond the mesal lobe of the galea but attached to the 
stipes beneath this lobe of the galea. Dolerus is a compara- 
tively generalized tenthredinid yet it shows an early stage in the 
migration of the lacinia from the distal end of the maxilla. A 
somewhat similar condition is shown in the maxilla of an 
ichneumonid, Ophion bilineatum (Fig. 5). The two lobes of 
the galea are large, the mesal lobe is a broad flat plate and 
almost completely covers the lacinia, which is a broad lobe 
attached to the side of the stipes. The lateral lobe of the galea 
is elongated and terminal as in the higher Hymenoptera. 
In the white faced hornet, Vespa maculata (Fig. 6), the 
maxilla shows a decided elongation of all the parts, the cardo, 
stipes, and lateral lobe of the galea. The sclerites are not all 
arranged in the same plane as with the maxille previously 
described. This is due to the fact that the maxillze are closely 
appressed to the sides of the convex labium or lower lip, which 
