. Bulletin - American Museum of Natural History. Natural history; Science. 492 Bulletin American Museum of Natural History. [Vol. XXII, projecting beyond the tip of the abdomen for a distance nearly equal to the length of the abdomen. Wings with only one closed submarginal cell, a second closed one perhaps very faintly indicated by a tranvserse vein. The humeral area apparently undivided. Antennas 8- or 9-jointed, the flagellar joints equal in length or nearly so, except the first. Abdomen wider than the thorax, con- sisting of seven nearly equal segments. Type L. parvus sp. nov. The specimen
. Bulletin - American Museum of Natural History. Natural history; Science. 492 Bulletin American Museum of Natural History. [Vol. XXII, projecting beyond the tip of the abdomen for a distance nearly equal to the length of the abdomen. Wings with only one closed submarginal cell, a second closed one perhaps very faintly indicated by a tranvserse vein. The humeral area apparently undivided. Antennas 8- or 9-jointed, the flagellar joints equal in length or nearly so, except the first. Abdomen wider than the thorax, con- sisting of seven nearly equal segments. Type L. parvus sp. nov. The specimen upon which this genus is founded cannot be placed in any recent genus and I have been compelled to define a new one for its reception. It would seem to fall into the subfamily Oryssinae as defined by Konow ^ where it comes nearest to Oryssus, from which it differs as pointed out above. Lithoryssus parvus sp. nov. Female. Length mm. Black, the abdomen brownish or rufous. Wings with a" brownish tinge. Antennae 8- or 9-jointed, more probably 9, the apical five or six joints nearly equal in length, each about two and one-half times as long as wide, the first (?) flagellar joint longer and narrowed basally. Wings with the costal and sub- costal veins thickened, not united at the root of the wing; submedian cell much longer than the median. First submarginal cell a little more than two times as long as high, narrowed at the tip; second submar- ginal open, receiving the recurrent nervure one-fourth of the way from the first transverse cubitus to wing tip. Second transverse cubitus perhaps feebly indicated, but not distinct. Described from one specimen seen in dorsal aspect, collected in a bank facing north, three-quarters of a mile southwest by west of Flor- issant, Colorado. flCHNEUMONID^ Subfamily Cryptin^. Mesostenus modestus sp. nov. Length mm. This is a rather poorly preserved specimen, but is I think surely a member of the tribe Mesostenini on account of the wing ve
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