. Synopsis of American wasps [microform] : solitary wasps. Wasps; Wasps; Hymenoptera; Guèpes; Guèpes; Hyménoptères. TIic flilTienlty in distinguii^hing tlic Slcnodynerua from the Pachodi/ncrua and tlic true Odijncrns obliges us to make a review of the ciiarncters which are peculiar to each. The clypcus is not characteristic in any. Generally pyriform, truncate, and biangulate at tip; iu 9 sometimes rounded; in % polygonal-truncate and bidentate. The thoi'ax is cylindrical when the abdomen is elongate- cylindrical, vaulted above, anteriorly nut contracted, biangulatc (0. conformis, toUccus, per
. Synopsis of American wasps [microform] : solitary wasps. Wasps; Wasps; Hymenoptera; Guèpes; Guèpes; Hyménoptères. TIic flilTienlty in distinguii^hing tlic Slcnodynerua from the Pachodi/ncrua and tlic true Odijncrns obliges us to make a review of the ciiarncters which are peculiar to each. The clypcus is not characteristic in any. Generally pyriform, truncate, and biangulate at tip; iu 9 sometimes rounded; in % polygonal-truncate and bidentate. The thoi'ax is cylindrical when the abdomen is elongate- cylindrical, vaulted above, anteriorly nut contracted, biangulatc (0. conformis, toUccus, perennis, etc.). When the abdomen is more ovate or spindle-shaped, the therax is not so elongate, more triangular, contracted behind. It is nearly always more or less coarsely punctured, the nietathorax being less strongly punctured. The j^ost-scutel is rery peculiar. It has two different forms: 1st. Not truncate; that is, angulatc behind, not forming a superior transverse punctate face and a posterior vertical polished face, but on the contrary entire; rather horizontal or oblique, falling into the hinder face of nietathorax, more elevated anteriorly than posteriorly, as if it had been a little squeezed from behind forwards, so as to accumulate it somewhat along the anterior margin; when crested, the crest is placed on this elevated part near the anterior margin, and not, as in the Divis. Odynorus, on the posterior edge formed by the truncation. "When not trun- cate, it is punctured on its whole surface, ?d. Truncate posteriorly and crested on the ridge of the trun- cation, nearly as in Divis. Odi/neriis. But in this case the trun- cation is more oblique, as if impressed from behind, and the crest rather pushed forward against the anterior margin. The tion also is not as straight transversely, but is rather In case the scutel is truncate, the Slcnodijncrus arc yet quite distinct from Divis. , in having the nietathorax quite convex, not widely
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectwasps, bookyear1875
