10 
Psyche 
[March 
(figs. 1, 5 and 7), in Merope (fig. 13), in Nannochorista 
(fig. 10) and in Boreus (fig. 9), however, and this may 
indicate that Notiothauma is very like the common ances- 
tors of all of these Mecoptera, since the ancestors of these 
forms must have had a stylorgan, if this structure is devel- 
oped in these families. 
Aside from the presence of stylorgans o in both Notio- 
thauma (fig. 7) and Merope (fig. 16) the gonostyles st 
themselves are not very similar in the Notiothaumidse and 
Meropidse, since the gonostyli of Merope (fig. 16) are long 
and slender and resemble those of certain Chironomid 
Diptera in contour, while the gonostyli of Notiothauma are 
more like those of the Dipteron Trichocera bitub erculata 
in contour, and it is amazing that the gonostyli of these 
closely related famiiles of Mecoptera (the Notiothaumidse 
and Meropidse, should resemble the gonostyli of Diptera 
more than they resemble each other. 
The gonostyli st of Notiothauma (figs. 5 and 7) are more 
normal, and therefore furnish better starting points for 
tracing the development of the gonostyles of other Mecop- 
tera than is the case in other primitive Mecoptera such as 
Chorista (fig. 12) in w T hich the basitubercle b and the medi- 
tubercle m are modified in a peculiar manner, and the gono- 
style is not as much like those of Panorpodes (fig. 13) and 
the Panorpidas (fig. 23) as the gonostyle of Notiothauma is. 
The gonostyle st of the Indian Panorpid from Mysore, 
shown in fig. 23, is so astonishingly hairy that this remark- 
able Panorpid should be called “Panorpa hirsuta” if it 
should prove to be new to science, and an appropriate name 
is desired for it ! The Panorpid shown in fig. 8 has remark- 
ably “thin,” leaf-like gonostyli st with a peculiar basitu- 
bercle b and meditubercle m, and with a very peculiar 
mesal process en or “endostyle” which may represent the 
inner branch of the divided gonostyli in Diptera (i. e., the 
so-called inner basistyle in certain Diptera) . In comparison 
with the size of the coxites which bear them, the gonostyli 
st are rather short in the Boreidse (fig. 9) and Nanno- 
choristidse (fig. 10) ; and in the Bittacidse represented by 
Harpobittacus (fig. 11) the gonostyli st become tremen- 
