Till. CONCHUELA. 
27 
Fig. 2.— The conchuela: Nymph, first instar. 
Enlarged 21 diameters. (Original.) 
NYMPHS. 
Figs. 2-6.) 
First instar.— In the first instar the head and thorax are deep brown. 
The abdomen is deep slate-gray with a middorsal scries of shiny 
black spots, whitish at the marginal incisures between which just 
inside the margin of each segment is a spot of deep brown. Speci- 
mens in this Btage vary in length 
from 1 to 1.75 mm. and in width 
from 1 to 1.5 mm. according to 
individual variation and age. 
Second instar. — The head and 
thorax of the nymphs in the 
second instar are shiny black, 
the thorax being margined with 
yellowish or orange -red. The 
abdomen above is dark viola- 
ceous, the venter paler. There 
is a series of brack spots on 
the dorsum of the abdomen as 
in the first instar and a ventral series of black spots is sometimes 
present along middle one to each of the last four segments. The 
abdominal segments above and below have a yellowish or orange-red 
border, which narrows posteriorly. The length of second-instar 
nymphs varies from 1.6 
to 2.5 mm., and the 
width from 1.3 to 2 
mm. 
Th i rd i n sta r. — T h e 
nymphs in the third in- 
star are much like those 
of the second but are 
subject to greater vari- 
ation in color. There 
is more or less olivace- 
ous along the middle of 
the venter of the thorax. 
The abdomen usually 
has a pale violaceous 
ground color and dark 
violaceous spotting. The Neutral series of spots is usually distinct. 
consisting of one spot on each of the segments from the fourth to the 
eighth, the anterior spot being the smallest. Frequently inside the 
reddish border on each segment from tin 1 second to the ninth is a 
more or less thickened crescentic black mark. Corresponding 
Kig. 3.— The oonchuela: Nymph, second instar 
ameters. i original.) 
Enlarged 21 di- 
