. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig, 2.—The conchuela: Nymph, first instar. Enlarged 21 diameters. (Original.) (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 series of shiny black spots, whitish at the marginal incisures between which iust inside the margin of each segment is a spot of deep brown. Speci- mens in this stage vary in length from 1 to mm. and in width from 1 to mm. according to individual variation and age. Second instar.—The head and thora
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig, 2.—The conchuela: Nymph, first instar. Enlarged 21 diameters. (Original.) (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 series of shiny black spots, whitish at the marginal incisures between which iust inside the margin of each segment is a spot of deep brown. Speci- mens in this stage vary in length from 1 to mm. and in width from 1 to 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 Mack 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 to mm., and the width from to 2 mm. Third instar.—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 ventral 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 the second to the ninth is a more or less thickened crescentic black mark. Corresponding. Fig. 3.—The conchuela: Nymph, second instar. ameters. (Original.) Enlarged 21 di-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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