. Bulletin. Natural history; Natural history. 264 Illinois Natural History Survey Bulletin Fol. 23, Art. 1. portion lighter brown, frons with a pair of cream-colored marks along lateral margin; thoracic sclerites dark brown. Legs with coxae brown, remainder of segments shad- ing to a chestnut brown, the upper and lower edges of the femora black. Lateral fringe present on segments 3-7. Case.—Fig. 904. Length 12 mm., almost square in cross section and smooth in out- line, constructed of wood fragments. Adults.—Length 9-11 mm. Head, body, antennae and most of legs dark brown to black, tarsi whiti
. Bulletin. Natural history; Natural history. 264 Illinois Natural History Survey Bulletin Fol. 23, Art. 1. portion lighter brown, frons with a pair of cream-colored marks along lateral margin; thoracic sclerites dark brown. Legs with coxae brown, remainder of segments shad- ing to a chestnut brown, the upper and lower edges of the femora black. Lateral fringe present on segments 3-7. Case.—Fig. 904. Length 12 mm., almost square in cross section and smooth in out- line, constructed of wood fragments. Adults.—Length 9-11 mm. Head, body, antennae and most of legs dark brown to black, tarsi whitish and abdomen with a wide lateral line; wings tawny, frequently almost white, with a series of pale spots giving a somewhat checkered appearance. Male genitalia, fig. 899: cerci ovate and widely separated to base; claspers curved, the base narrow, the curve narrow and necklike, the apical portion swollen, nar- rowed to a sharp tip; tenth tergite divided down meson into a pair of long apical proc- esses, each bearing one or two long macro- chaetae directed laterad. Female genitalia, fig. 902, consisting of simple plates and a small bursa copulatrix. Neotype, male. — Momence, Illinois: May 4, 1937, Ross & Mohr. /'QoaB 900 C Figs. 898-900.—Brachycentrus, male geni- talia. A, lateral aspect; B, dorsal aspect; C, tenth tergite, dorsal aspect; D, apex of clasper, ventro-caudal aspect. than long; eighth sternite with apical lobes wide and large, fig. 902 numerosus, p. 264 Lateral aspect of apical tergite long, apical portion oblique and much longer than deep; eighth sternite with apical lobes narrower and smaller, fig. 901. . americanus, p. 266 Brachycentrus numerosus (Say) Phryganea numerosa Say (1823, p. 160). Figs. 901-903.—Brachycentrus^ female geni- Larva.—Fig. 896. Length 12 mm. Head talia. A, ventral aspect; 5,"lateral aspect of with ventral portion dark brown, dorsal ninth and tenth Please note that these images are extracted from scanned page
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