312 PROCEEDINGS OF THE ]SrATIONAL MUSEUM vol.88 



of dorsal area ; anterolateral margins of pronotum strongly carinate ; 

 anterior dorsal carina interrupted on mesal one-fifth; prepectus nar- 

 row, tongue-shaped, extending to tegula ; anterior margin of mesoscu- 

 tellum with a minute mesal notch, apex of mesoscutellum with a nar- 

 row, mesally depressed lamina; metepisternum strongly punctured, 

 pubescence long and dense ; metacoxa rather squarely truncate at base, 

 surface glabrous, provided with sparse, short pubescence on ventral 

 side ; outer surface of metaf emur densely covered by short pubescence, 

 from 17 to 24 small, blunt, closely set teeth present on ventral margin ; 

 distinct inner tooth present. 



Propodeum provided with a few large carinae, two lateral areas at 

 base minutely shagreened, a small tooth present at each posterolateral 

 angle, spiracular openings nearly vertical ; petiole slightly more than 

 twice as long as wide at widest point, basal lamina wide on ventral 

 side, slightly narrower on dorsal side; prominent lateral grooves 

 usually present ; gaster slightly longer than metaf emur, third abdomi- 

 nal segment usually as long as all following segments combined, lateral 

 row of setae usually present only on segment 4, although some speci- 

 mens have a few lateral setae on segment 6 or 7 ; eighth tergite minutely 

 reticulated, sparsely pubescent; spiracular openings minute, round; 

 cerci oval, located near posterior margin of epipygium and provided 

 with five to seven long setae ; apices of ovipositor sheaths with a few 

 ventral setae. 



Male : 4-4.5 mm. Antennal scape (fig. 9, d) stout ; combined widths 

 of compound eyes one-third less than width of interocular space at 

 level of antennal bases ; petiole two and one-half times as long as wide. 



Type locality. — Mexico. 



Types. — Holotype, female, 1808.1; paratype, 1808.2: Academy of 

 Natural Sciences of Philadelphia. Synonym: nigropleuralk Ash- 

 mead, H. H. Smith collection, Carnegie Museum, 



The types of nigropleuralis Ashmead differ very slightly from those 

 of S. juxta Cresson in the distinctness of the carinae of the genae. 

 The available material shows this difference to intergrade. 



Host. — Unknown. 



Distribution. — Illinois: Monticello, June 11, 1934, Frison and 

 DeLong, 1 male. Kansas: Atchison County, July 11, 1924, K. H. 

 Beamer, 1 male. Maryland: Cabin John, September 2, 1914, R. C. 

 Shannon, 1 female. Texas : Brownsville, February 8, 1926, P. A. Glick, 

 1 male. 



Mexico: Sumichrast, 2 females (holotype and paratype); Mata- 

 moros, August 10-12, 1903, W. L. Tower, 1 female, 1 male. 



Trinidad, B. W. I. : 1 female, 1 male (cotypes of nigropleuralis Ash- 

 mead). 



Brazil: Chapada, 1 female (cotype of nigropleuralis Ashmead). 



