. Bulletin. Natural history; Natural history. 338 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:IV Nymphal male, fig. 268.—General ground color of dorsum dark brown, with yellowish brown marking as follows: area behind epicranial arms, wing pads, median line and lateral margins of pronotum, spots on meso- and metanotum, spots on basal margins of abdominal tergites. Venter in general lighter than dorsum. Most specimens well incrusted with fine debris so that the ob- scure and rather indefinite color pattern is not evident. Head with three ocelli forming a triangle, lateral ocelli about on a line
. Bulletin. Natural history; Natural history. 338 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:IV Nymphal male, fig. 268.—General ground color of dorsum dark brown, with yellowish brown marking as follows: area behind epicranial arms, wing pads, median line and lateral margins of pronotum, spots on meso- and metanotum, spots on basal margins of abdominal tergites. Venter in general lighter than dorsum. Most specimens well incrusted with fine debris so that the ob- scure and rather indefinite color pattern is not evident. Head with three ocelli forming a triangle, lateral ocelli about on a line with anterior margin of compound ej-es and slightly farther apart than distant from median ocellus; a round impunc- tate spot on each side of head between lateral ocellus and base of antennae. Labrum, fig. 28, labium, fig. 114, maxilla, fig. 84, mandibles, fig. 54, and submentum, fig. 160, as illustrated. Pronotum much broader than long, posterior margin wider than anterior margin, anterior angles conspicuously and laterally produced, posterior angles pro- duced but less so than anterior angles and slightly directed backwards. Mesonotum with wing pads rounded at tip and pro- duced mainly backwards. Metanotum with wing pads rounded at tip and pro- duced more laterally. Legs with femur, tibia and tarsus fringed with long hairs, fig. 259; first and second tarsal segments about of equal length, third tarsal segment much longer than preceding two combined. Abdominal segments transverse, ex- cept modified apical segments. Ninth sternite with posterior margin in middle area produced as a lobe, fig. 274. partially over tenth sternite, the lobe slightly notched. Tenth tergite much produced posteriorly and downwards, fig. 274, entirely covering tenth tergite, with a small thumblike projection on dorsum near end. Cerci not as long as abdomen, composed of about 40 segments, apical segments longest and narrowest. Gills present on venter, fig. 267, arranged in pairs anterior and posterior
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