[June 1884. BULLETIN BROOKLYN ENTOM. SOC. VOL. VII. 17 
joint is short as compared with the second, and the third ‘is variable, 
ranging from as long as the second, to only one-fourth or one-fifth its 
length. There is also a sexual variation, the third joint being in some 
cases slenderer and more produced in the female. The variation in this 
respect is in some species quite considerable. 
The antenne are ciliate, scaled and hardly fringed with hair above, 
and with slight tuftings of hair below, on each joint. The sexual varia- 
tion is very slight, and this is also true of the specific variation. The 
joints are comparatively shorter and more compact towards the base, 
slenderer and more lengthened at the point. ‘There is much variation 
in the number of the joints in the different species, ranging from about 
60 to about 110. The number varies slightly in the same species, so it 
can not be made a basis for specific determination. The ocell are two 
in number, situated near, and just behind the antennz, and are black 
and prominent. 
The ¢horax is rather stout and heavy, subquadrate, clothed with 
hairs intermixed with flattened scales, though in some species the hairs 
are almost wanting. It is somewhat more squammose in the male than in 
the female and is tufted posteriorly. The pafagi@ are well developed, and 
reach with vestiture nearly or quite the length of the thorax; they are 
somewhat less appressed in the male than in the female. 
In anatomical structure the thorax occupies a pcsition between the 
typical /Voc/wid form, and that of the typical Geometrid. The proscutum 
is narrower, and more extended laterally than that of the typical Woctuid; 
the mesoscutum is much more slender and postericrly extended; the 
scutellum of the mesothorax is shorter and posteriorly more rounded: the 
scutellum of the metathorax is shorter and broader leterally. I refrain 
from the discussion of the comparative anatoray of the thorax, beyond 
fhis, because my friend, Mr. John B. Smith, who has been somewhat of 
an inspiration to me in this line of research, is making a special study of 
this portion of the imago of the Mocfuzd@, and I do no: wish to anticipate 
his work. I will only say, that on the basis of thoracic structure, the 
affinities of the genus are as strongly with the Geometridae as with the 
Noctuide, thus carrying out what has already been evidenced in the larva 
and pupa by their general appearance and habits. 
The abdomen is somewhat extended, conical or cylindro-conical, 
considerably keeled dorsally in nwdzzs, less in others, (Chnéonii etc.) and 
in others not at ail; the tendency being, in all cases, more marked in 
