A NEW MASON-WASP FROM VIIIGINIA — BEQUAERT 83 



much less than half length of flagellum; third segment about one 

 and one-half times as long as fourth; fourth to sixth longer than 

 wide; seventh and eleventh almost square; eighth to tenth slightly 

 wider than long; twelfth about as long as basal width. Mandible 

 straight, nearly as long as eye; apex blunt, hardly curved; in- 

 ner margin with four narrow notches producing broad, bluntly 

 rounded teeth. Maxillary palpi 6-segmented; four basal segments 

 gradually shorter, three terminal segments combined much longer 

 than third; labial palpi 4-segmented. Thorax (fig. 15, C) short 

 and very stubby, sides almost parallel, narrowed slightly ante- 

 riorly; seen from above little longer than greatest width, in 

 profile almost as high as long. Humeral margin of pronotum slightly 

 curved inward, margined dorsally by a very fine carina, interrupted 

 medially, on sides more sharply carinate to anterior coxae; humeri 

 very broadly rounded ; pronotum without carina between dorsal hori- 

 zontal and lateral vertical areas. Mesonotum about as Avide as long, 

 nearly pentagonal in outline, with broadly rounded anterior margin, 

 very slightly convex, with mere traces of notauli and parapsidal fur- 

 rows posteriorly, anterior fourth with fine, impressed median line. 

 Tegula semielliptical, nearly twice as long as wide, with somewhat 

 carinate margins ; posttegula forming a broad lobe, somewhat curved 

 upward, with blunt apex. Scutellum rectangular, about three times 

 as wide as long, very slightly raised, disk somewhat flattened, with a 

 fine median longitudinal impressed line, deep mesonotal suture foveo- 

 late, with longitudinal riblets; postscutellar suture moderately im- 

 pressed, not foveolate. Postscutellum convex, with a short anterior 

 horizontal area and much longer, posterior, vertical portion (part of 

 the concavity of propodeum) , separated by a sharply crenulate, trans- 

 verse crest (of 8 to 10 irregular teeth), narrowly interrupted medially 

 by a groove. Median mesepisternal groove very deep, complete, trans- 

 versely ribbed ; prepectal suture present in lower part only as a fine 

 carina, running obliquely to near base of mid coxa. Propodeum 

 very short, squarely and vertically truncate behind, swollen laterally ; 

 dorsal areas very broadly separated medially by vertical face of post- 

 scutellum ; concavity wide and deep, divided by a low, broad, smooth 

 longitudinal ridge, which expands suddenly into a broad triangle 

 along hind margin of postscutellum; no superior ridges; inferior 

 and lateral ridges bluntly rounded, without carinae or teeth ; lateral 

 angles prominent, broadly triangular, with sharp apex; lateral areas 

 slightly concave. Abdomen short and very stubby. First tergite 

 short, transverse, with faint trace of median impressed line poste- 

 riorly, as broad as thorax and scarcely narrower than second; seen 

 from above, broadly semielliptical in outline, width of hind margin 

 little over median length ; transition between vertical and horizontal 

 areas evenly but strongly convex and rounded off; hind margin 



