Proceedings of the United States National Museum . l sclerotized as hypostoma 17 17. Labral sclerite with single median expansion Heniiteles Labral sclerite not expanded in its median part and with two small dorsolateral expansions Mastrus argeae (Viereck) 18. Mandible with rounded base and relatively short blade. Gesis bruesii (Strickland)Mandible with a conical base and relatively long slender blade . Phobetes Of the characters used in the above key, the form of the labralsclerite and its degree of sclerotization is not a good one. In some casesthe character is clear, but in others it may be
Proceedings of the United States National Museum . l sclerotized as hypostoma 17 17. Labral sclerite with single median expansion Heniiteles Labral sclerite not expanded in its median part and with two small dorsolateral expansions Mastrus argeae (Viereck) 18. Mandible with rounded base and relatively short blade. Gesis bruesii (Strickland)Mandible with a conical base and relatively long slender blade . Phobetes Of the characters used in the above key, the form of the labralsclerite and its degree of sclerotization is not a good one. In some casesthe character is clear, but in others it may be obscured when the entirelength of the sclerite has not been forced into the one plane duringmounting. However, since the tribe is extremely uniform and thelabral sclerite does differ in shape and degree of sclerotization in dif-ferent genera, it was found necessary to use this character. Teeth on the ventral surface of the blade of the mandible are usually very small and must be looked forwith great care. 430 PROCEEDINGS OF THE NATIONAL MUSEUM. < / \
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
