52 PROCEEDINGS OF THE ACADEMY OF [Feb., 



c?. — Colored like 9, but with clypeus entirely, maudibles except 

 tips, aud the fore margin of pronotum more or less, yellow ; clypeus 

 hexagonal the apical teeth closer and sharper; no fovea behind 

 ocelli ; fiagellum elongate, together with the two preceding joints 

 longer than head and thorax, subclavate, hooked at tip, the last two 

 joints united barely longer than joint 11 ; longitudinal furrow of 

 segment fainter or absent; general punctuation coarser than 

 in ?. Length 8-10 mm. 



Chapada (January, May, October) ; Corumba (April). Eleven 

 9, twenty-seven c^ specimens. In the longitudinally sulcate first 

 segment this insect approaches Symmorphus, but the hooked antennae 

 of the male excludes it from that section of the genus. 

 Odynerus (AnoistrooerusT) oonjunctus n. sp. 



9. — Black, with sericeous pile, that on sides of face somewhat 

 silvery; clypeus except medial spot, mandibles near base, scape 

 beneath, dot at base of antenna?, short line in eye-emargination, 

 line on cheeks near vertex, pronotum anteriorly in middle and its 

 hind margin, scutellum, postscutellum, tegulse at base and apex, 

 spot directly under them, a somewhat semicircular mark on each 

 side of posterior face of middle segment, and a fascia at apex of 

 segments 1—5, yellow ; the fascia of segment 1 broadest and extends 

 on the sides as far as the carina ; flagellum beneath fulvous ; some- 

 times the pronotum has on each side two obliquely parallel lines of 

 rufous, one bordering the posterior margin ; legs dark, the four 

 anterior femora beneath toward apex, and all the tibiae beneath 

 more or less yellow, tarsi dark testaceous. Head with deep sep- 

 arated punctures, a rather transverse fovea behind ocelli ; the latter 

 not margined by tubercles ; clypeus subcouvex, depressed apically, 

 somewhat triangular, broader than long, with rather distinct, separ- 

 ated punctures, the fore margin with two rather sharp aud widely 

 separated, diverging teeth ; thorax with strong, separated punctures, 

 those on scutellum and sides of pronotum less close ; those on meso- 

 pleurie smallest ; middle segment above rugoso-punctate, on sides 

 with sparse shallow punctures; scutellum entire ; postscutellum with 

 a slight emargination anteriorly in middle ; middle segment with 

 scarcely a medial upper surface, the posterior face broadly depressed, 

 margined by a ridge, which reaches its greatest development api- 

 cally ; first abdominal segment closely punctured, the carina sharp 

 aud when viewed from the front shows a sharp angle above, dorsal 



