. Bulletin. Natural history; Natural history. 373. Mouth cone large, broadly rounded, reaching base of prostemum; la- brum blunt. Prothorax short, about two-thirds as long as head, and armed with six pairs of knob- bed bristles. Legs short, stout; fore tarsi unarmed. This genus is the only one of its family (excepting Kladothrips Froggatt) which has seven-seg- mented antennae. The reduction in the number of antennal seg- ments is a result of the union of the two apical ones, and the whole antenna is an exaggeration of the type indicated by Neothrips gen. no\'., in which a separating suture is
. Bulletin. Natural history; Natural history. 373. Mouth cone large, broadly rounded, reaching base of prostemum; la- brum blunt. Prothorax short, about two-thirds as long as head, and armed with six pairs of knob- bed bristles. Legs short, stout; fore tarsi unarmed. This genus is the only one of its family (excepting Kladothrips Froggatt) which has seven-seg- mented antennae. The reduction in the number of antennal seg- ments is a result of the union of the two apical ones, and the whole antenna is an exaggeration of the type indicated by Neothrips gen. no\'., in which a separating suture is still distinctly visible. Allothrips megacephalus sp. nov. (Fig. 7). Female.—Length about L3 mm. Color dark blackish brown, with maroon-colored hypodemial pigmen- tation; tarsi, tube, and antennal segments 1 and 2 slightly lighter. Ab- domen broad, about one and one-half times as wide as prothorax. Forma aptera.—Eyes ver}^ small, consisting of a few large lateral facets. Ocelli lacking. Pterothorax about as long as prothorax; meso- notum transverse, sub-rectangular, with six equidistant knobbed bristles along its posterior border, and with an additional similar pair near the posterior angles. Measurements:—Total length mm.; head, length .21 mm., width .20 mm.; prothorax, length . 14 mm., width (including coxas) .30 mm.; pterothorax, width .30 mm.; abdomen, width .45 mm; tube, length . 12 mm., width at base .082 mm., at apex .044 mm. Antennae: 1,38,«;2, 57;<;3, 51/z;4, 41/x; 5,44//;6, 44/i; 7, 67/z; total, .34 mm. Forma brachyptera.—Eyes moderately large, coarsely faceted. Ocelli present; a pair of long knobbed bristles behind the posterior ones. Pterothorax about twice as long as prothorax; mesonotum sub-pentago- nal, with two pairs of knobbed bristles along its posterior border. Wings attaining base of abdomen. Described from several females, one of them brachypterous, taken under bark on various trees at Urbana and Springfield, Illinois, in winter. Fig. 7 All
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
