Packard.] 
346 
[May 2, 
Shp 
"I should also add that the fact, that the efferent passage of the 
thoracic salivary glands is continued as the canal of the seta in 
question is an additional sure j)roof of its interpretation as the 
hyj)Opharynx (Fig. 23, liy). I have earlier urged that this 
generally agrees with the structure of the 
armature of the mouth-cavity. It only 
varies in the form and size of the parts of 
which it is composed. In the special case 
before us the ribbon-like hypopharynx lies 
flat on the incurved edges of the labrum, 
and thus bridges over the ventral longitu- 
dinal opening of the food-passage (Fig. 8, 
hy). The swollen portion of the dorsal 
wall of the salivary duct serves as a sup- 
port between the labrum and hypopharynx, 
while like the groove in a rabbet it fits 
tightly into the opening of the tube, and 
thus ])revents a lateral dis|)lacenient of both 
of the mouth-parts. But the end of the 
hypoj)harynx in which the external end of 
the salivary duct opens, projects anteriorl}'^ 
in the opening of the mouth as a small free 
piece beyond the shorter labrum." 
• Miiggenberg then briefly describes the 
mouth -parts of Braula coeca, adding excel- 
lent and clear figures, two of whicli we 
copy. He states that the mouth-parts are 
very different from those of other Pupipara. 
There is a large lunate clypeus. The short 
beak is composed of the same parts as in 
the Ilippoboscidae, viz., the labrum, hypo- 
pharynx, and labium (Fig. 34, Ibr, hp, lb). 
The labium ends in two hairy leaves, the 
homologues of the labella of the Muscidae. 
The maxillary palpi (Fig. 33, mxj)) are 
short, strongly setose lobes which project from each side of the 
clypeus. These rudimentavy maxillary palpi take no i)art in the 
act of sucking. 
Finally, having in detail reviewed the literature descriptive of 
s.d 
Fig. 29. Pharynx 
and hypopharynx of 
^S* i m uliu m fuscipes • 
Iph^ lower lamina of 
the pharynx; p, the 
salivary duct (sd) per- 
forating the pharynx; 
0, orifice of the duct ; 
slip, styles of the hy- 
popharynx \mph, mem- 
branous edge of the 
hypopharynx ; m, pro- 
tractor muscle of the 
pharynx; rjp, gusta- 
tory papillae? — After 
3T('Anert. 
