Proceedings of the United States National Museum . otrephusrufiventrus (Gravenhorst) (fig. 47b) (the head parts other than thelabium were damaged in this specimen), Syrphoctonus agilis (Cresson),and aS. maculifrons (Cresson) (fig. 47c). The epistoma is unsclerotized; the pleurostoma is lightly sclerotized;a small part of the hypostoma is very lightly sclerotized as is a smallpart of the hypostomal spur; the stipital sclerite is absent; the labialsclerite is well sclerotized and of characteristic shape with a ventralspine-like projection; the maxillary and labial palps are present, butsetae app
Proceedings of the United States National Museum . otrephusrufiventrus (Gravenhorst) (fig. 47b) (the head parts other than thelabium were damaged in this specimen), Syrphoctonus agilis (Cresson),and aS. maculifrons (Cresson) (fig. 47c). The epistoma is unsclerotized; the pleurostoma is lightly sclerotized;a small part of the hypostoma is very lightly sclerotized as is a smallpart of the hypostomal spur; the stipital sclerite is absent; the labialsclerite is well sclerotized and of characteristic shape with a ventralspine-like projection; the maxillary and labial palps are present, butsetae appear to be absent from the maxillae and labium; there isa faintly sclerotized area at the dorsal end of the labial sclerite whichmay represent the silk press; the labral sclerite is absent; groups ofsensilla are present on raised areas of the labrum; the mandibles areusually very lightly sclerotized although the blade is lightly sclerotizedin some species; the antenna was not seen in any cast skin and is ICHNEUMONID FINAL INSTAR LARVAE—SHORT 477. O -1 mm
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
