SPHEROMA CURTUM. 413 
and from which the following description is made, as well 
as the accompanying figures are taken. 
The upper surface of the animal is quite smooth. The 
head is produced into a small, somewhat hastate point in 
front. ‘The upper antenne have the very large flat basal 
joint affixed by a small rounded rotule ; the second joint 
of these antenne is transversely oval, followed by two 
slender joints, and about eight articuli, forming the flagel- 
lum. The lower antennz are but little longer than the 
upper. The first segment of the body is dilated at the 
sides ; both the anterior and posterior angles being pointed 
and produced. ‘The three following segments are pointed 
at the extremity of the lateral margins; and the three 
terminal segments have the lateral angles more ovate. 
The tail has the first segment distinctly indicated by 
a transverse slightly impressed line, extending across 
the whole breadth of its base, the middle portion of 
the line extending rather more backwards than the side 
portions, which reach only to the inner portion of the 
terminal lateral lobe of the seventh segment of the body. 
The second, third, and fourth segments of the tail are 
confluent in the middle of the back, and in certain lights 
the posterior margin of this confluent mass exhibits 
traces of two small tubercles, wide apart, in front of the 
two large dorsal rounded tubercles of the terminal seg- 
ment. The last segment has the middle of its extremity 
produced into an obtuse point, which is slightly notched 
on each side; and on looking at the animal from behind 
this part appears semitubular, the produced apex forming 
asmall arch. ‘The lateral appendages of the tail do not 
extend so far back as its extremity, and they have both 
divisions obliquely truncate, and very slightly emarginate. 
In the above woodcut the right-hand figure v represents 
the right-hand portion of the hind part of the body and 
