1902.] NATURAL SCIENCES OF PHILADELPHIA. 61 



rounded, convex, triangularly emarginate ; hind ocelli margined by 

 a tubercle internally; flagellum elongate, subclavate, the apical 

 joint about as long as the preceding two united, the penultimate 

 minute ; length of firet dorsal segment from carina to apex not 

 greater than half its width ; apical margin of second doi*sal slightly 

 reflexed. Length 7-8 mm. 



Chapada (September, December, January, March). Three ?, 

 four d^ specimens. The striated clypeus, brown unspotted legulse 

 and dark legs are apparently constant characteristics of this 

 species. 

 Odynerus inusitatus n. sp. 



c?'. — Black ; line between insertion of antennae, line in eye-emar- 

 gination bordering the orbit, scape beneath, clypeus (except a black 

 medial spot), mandibles except apex and outer margin, short line 

 on cheeks near summit, spot at lateral angles and at each side of 

 middle of pronotum (none of these spots touching the fore margin), 

 spot under tegulte and a smaller one behind them, and on them at 

 base, postscutellum except apex, spot on post ero -lateral angles of 

 middle segment, a line at apex of segments 1-6, four anterior 

 femora more or less at apex, and all the tibiae more or less, yellow. 

 Head with deep, more evenly separated punctures ; front subcou- 

 vex, slightly impressed ; hind ocelli margined by tubercles internally, 

 a deep furrow extending from between the tubercles back toward 

 the occiput; clypeus rather pyriform, convex, with unusually deep, 

 separated punctures, apex with two well -separated, acute teeth, 

 each of which is preceded by a fairly distinct carina; antenme 

 shorter than head and thorax united, the pedicel and flagellum ful- 

 vous beneath, terminal joint a little longer than the two preceding 

 united ; thorax with punctures larger and more separated than on 

 head, those on mesopleurae quite sparse ; pronotum cristate its entire 

 width, the lateral angles strongly dentate; scutellum and postscutel- 

 lum deeply impressed down middle; middle segment with a well- 

 developed medial surface above where it is rugoso-punctate, sides 

 with strong punctures becoming obsolete basally, concavity with 

 bordering ridge not well developed; carina of first segment not 

 sharp, though strong, bordered posteriorly by a series of small 

 foveas, but the segment has no smooth areas as in allied species, and 

 is marked dorsally by strong, separated punctures, its length from 

 the carina to apex is barely equal to half its vv^lth at apex; second 



