AMERICAN HYMKNOPTKRA. 281 



Belize (I. D. Johnson). 



The form of the second abdominal segment shows an approach to 

 that of trUuberculaius Cam. ; that species is larger, has the sides of 

 metauotum keeled or margined all round, and the first abdominal 

 segment wants the stout bordering keel on the base found in the 

 present species. 



'-""^dynenis (4nciMli*ocerii»«) iniiineMOtHMisis sp. nov. 



I^lack ; tlie clypeus, niaiidibles, excopt lielovv and at the apex, a triangular 

 small spot, dilated in the middle below, on the lower part of the front, a small 

 spot ou the outer orbits, near the top of the eyes, a band on apex of pronotuni, 

 narrowed in front, a triangular spot below the tegulse, postscutellum, the first 

 abdominal segment above, except its basal slope, its apical half below, the apical 

 fourth of the second segment above, and more narrowly below, and tlie antennal 

 scape, except the apical two-thirds above, red ; the underside of the antennal fla- 

 gellum pale orange-yellow; the legs of a lighter colored red than the red spots 

 on the body; wings fusco-hyaline, the apex broadly fuscous-violaceous, the nerv- 

 ures and stigma black. %, . Total length 7 nini. 



Clypeus clearly longer than wide, sparsely, distinctly punctured ; the aj)ex 

 with a rounded incision, wider than long; the top in the middle transverse, the 

 sides oblique; the puncturation coarse and strong, the pubescence very sparse. 

 Base of thorax transverse, the sides not projecting. Apex of postscut(?llum 

 obliquely narrowed to a blunt point; the apical edge black. Piothorax and nieso- 

 thorax strongly, closely punctured ; there is a broad smooth longitudinal line on 

 either side of the mesonotum near the apex. Base of metanotuni distinctly punc- 

 tured, but neither so closely nor so strongly as the mesonotum, the centre irreg- 

 ularly transversely reticulated, not much hollowed; tlie sides are broadly 

 rounded; the lower lateral spines distinct, pale, longish tiiangular; the meta- 

 jileuric are more weakly and less closely punctured than the nietanotum. First 

 abdominal segment elongated cup-shaped ; coarsely, closely jiunctured ; the toji 

 of the apical slope with the punctures larger and more elongated, forming a more 

 or less regular belt, bordered in the centre below by a curved, tripartite keel; 

 the segment is narrower than the second, which is distinctly longer than it is 

 wide at the apex; the latter is more strongly punctured than the rest, and is 

 slightly, but distinctly reflexed ; the other segments are more weakly punctured, 

 except the last, which is smooth. Antennae stout, becoming thicker towards 

 the apex; the hook is black, stout, curved ; its apex reaches to the base of the 

 eleventh joint. 



The base of the first abdominal segment is rounded above at the base; it is 

 longer and squarer than usual on the apical part, the sides being straight, not 

 rounded. The thorax is more than twice longer than wide. Tegulse rufous tes- 

 taceous. 



Minnesota, United States. 



Belongs to Saussure's Section B, b. (Syn. Am. Wasps, 198). The 

 red marks are unusual ; but they occur with 0. hldrio Lep., belong- 

 ing to the above noted section of OiUjncrus; in that species the 



TRANS. AM. ENT. SOC. XXXIV. JULY, 1908. 



