. Occasional papers of the California Academy of Sciences. ealar sumrenear the anterior end of the episteiTium which delim-its a small sclerotic area (prealar sclerite). This areamay represent a fusion of one of the anterior precox-al sclerites, which in females is separated from theepisteiTium. Another possibility is that it results fromsecondai7 folding. The suture is represented inter-nally as a strong ridge directed caudad. The dorsalend of the prealar suture forms a process separatedfrom the pleural wing process by a membranous basalare bridges the gap between these two pro-cesse
. Occasional papers of the California Academy of Sciences. ealar sumrenear the anterior end of the episteiTium which delim-its a small sclerotic area (prealar sclerite). This areamay represent a fusion of one of the anterior precox-al sclerites, which in females is separated from theepisteiTium. Another possibility is that it results fromsecondai7 folding. The suture is represented inter-nally as a strong ridge directed caudad. The dorsalend of the prealar suture forms a process separatedfrom the pleural wing process by a membranous basalare bridges the gap between these two pro-cesses in the fonn of a small, elongate, convex archwhich is firnily attached at either extremity. The sub-alar, a small unmodified scleilte, appears to be simi-lar in males throughout the order. The sternum of the pterothorax (Fig. 15B) is acomposite plate resulting from fusion of precoxalsclerites (free in females and young) with the basis-ternum and furcasternum. This fusion can readilv be 18 OCCASIONAL PAPERS OF THE CALIFORNIA ACADEMY OF SCIENCES, NO. 149. spiracular lobe-- acrotergite - ? prescutum - - . tegula - - _ . pteralia \ lateral flange ,^axillary cord - — episternum -pleural suture- epimeron scutellum acrotergite--— prescutum - -pteralia. -episternum - - pleural suture-- epimeron - - acrotergite- - ^ laterotergite abdominalspiracle 1
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscience, bookyear1890
