— 370 — 
ed, and without well defined plates, even in the 
aduit state; but a more careful study showed that 
the specimens in question, must be considered as 
identical with this species. 
Mesolecaniuin argaformis n. sp. 
The female has the body oval and flat. 9 mm. 
long, 7 mm. wide and 2.250 mm. high. The dor- 
sal surface is olive green in color, tinged with 
yellow in the central portion, and with the margin 
light yellow. The ventral surface is also colored 
light yellow on the margin and light green in the 
central portion. On the dorsal surface there are num- 
erous shallow depressions, which make it rough 
and uneqal. These depressions are arranged in two 
longitudinal rows on each side of the middle, and 
in the area between the margin of the body and 
the second row. Near the margin there are also 
some radiating furrows. The anal plates are small 
and dark brown in color. The posterior margin is 
slightly notched. The anal fissure is about 1.500 
mm. long, with the margins contiguous. The white, 
chalky lines of the stigmal areas are very evident. 
In some specimens the lateral margin of the body 
is recurved. On the dorsal surface there are also 
present small, thin particles of white wax. 
Boiled in a solution of KOH, the derm be- 
comes soft and transparent. The antennae are atro- 
vhied, apparently composed of 4 joints, and are about 
94 microns in length. The legs are also atrophied, 
only the first pair being noted, as small tubercles 
about 94 microns in length. The lateral margin is 
but slightly incised at the stigmal areas, these last 
being caracterized by three thick, curved spines, 
two of which are short, being but 44 microns in 
length, and the other is 75 microns in length. The 
spiracles are greatly removed from the lateral mar- 
gin, (from 1 to 1.400 mm. ), and the space be- 
tween these and the margin is furnished with hun- 
dreds of small, circular glands, about 6 microns in 
diameter. The dorsal glands are elongate near the 
