. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 4. -The conchuela: Nymph, third instar. ters. (Original.) Enlarged 13 diame- markings are sometimes present on the venter. The Hnes of the segments are usually dark in color. The length in this instar varies from to 4 mm., and the width from 3 to mm. Fourth instar.—The fourth instar is characterized by the first external evidence of the developing wing- pads. The ventral side of the head, and sometimes the two basal segments of the beak, are more or less oliva- ceous. The black crescentic markings in
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 4. -The conchuela: Nymph, third instar. ters. (Original.) Enlarged 13 diame- markings are sometimes present on the venter. The Hnes of the segments are usually dark in color. The length in this instar varies from to 4 mm., and the width from 3 to mm. Fourth instar.—The fourth instar is characterized by the first external evidence of the developing wing- pads. The ventral side of the head, and sometimes the two basal segments of the beak, are more or less oliva- ceous. The black crescentic markings inside the margin of the abdominal segments are more distinct than before. Otherwise the color corresponds very nearly with that of the third instar. The length of the fourth- instar nymph varies from to mm., and the width from to 5 mm. Fifth instar.—In the last or fifth nymphal instar the head and thorax are rarely uniformly black as in the two preceding instars but are more or less oliva- ceous, with black punc- tures. The venter of the thorax has usually an olivaceous but sometimes a pale pur- plish or rosaceous ground color, with black punctures and markings. The basal segments of the legs are more or less oliva- ceous. The abdomen is colored as in the previous instars except that the ventral series of spots along the mesal line is either absent or only faintly indicated. The length of the nymphs in the fifth stage varies from 9 to 11 mm., and the width from 6 to 8 Fig. 5.—The conchuela: Nymph, fourth instar. Enlarged 10 diameters. (Original.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology. Washington : G. P. O.
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