446 The Smallest Insect Known. [ July, 
ular microscope there was no great difficulty in seeing the proper 
connection and natural places of the parts. 5 
The body was found by micrometer to be twelve thousandths of - 
an inch in length, the antennæ, twenty thousandths. The head is 
comparatively large and plump, the longitudinal diameter being 
to the transverse as eight to five. The compound eyes when 
PEN E S LEPI ee MT EEAS 
nd a Ge Sj h. m E d 
TE S E E PE EEEN N ne A 
g 
seen in outline show eleven facets in section from front to rear; | 
they are of a bright brownish-red color. Three ocelli or stem- 
mata are seen on the top of the head, the middle one lunate in 
shape with concave side toward the front. These are separated 
from the forehead by a bow-shaped band having alternately dark 
and light divisions. The under side of the head with the mouth 
parts are shown at B in the woodcut, and these last are exceed- : 
ingly minute. All that can be clearly made out are two curved 
and pointed mandibles with faint traces of mouth opening, butno 
projecting ligula or proboscis. 
The antennz are very slender, consisting of ten joints, of which 
the first curves outward, with a distinct tooth on the inner side 
near the upper end; the second is oval, being only half the 
length of the others and broader; the remaining joints do not 
seem to be perfectly round, but rather four-sided, with points oF 
teeth at the upper end of all except the last, which terminates 1n 
a tapering tip. 
The thorax is the largest part of the body, equaling in bulk 
the head and abdomen together. The prothorax, mesothorax _ 
and metathorax are nearly equal in size, as may be seen bythe f 
= divisions of the back which are shown i in the figure. 
