1910] Brues, North American Parasitic Hymenoptera IX. 



81 



long as thick; following growing shorter until the last (sixth) is 

 nearly quadrate ; club ovate, as long as the two preceding joints. Sur- 

 face of head rugose-punctate, more finely so on the malar space and 

 vertex. Thorax elongate, the pronotum short, longer on the sides which 

 converge little anteriorly. Mesonotum with slight traces of furrows on 

 the sides in front, as long as its greatest length at the tegulae, its 

 surface confluently punctate or rugulose ; the scntellum and axillae 

 more finely so. Axillae separated by one-half the width of the sculel- 

 lum ; the latter oval, broader behind, one-half longer than wide. Meta- 

 thorax with a very distinct median carina which bifurcates behind ; 

 without spiracular sulci; not prolonged into a neck or globose at the 

 apex. Pleurae very finely rugulose, the mesopleura smooth above and 

 with a wedge-shaped piece extending downward near its middle. Under 

 side of thorax and sides of metanotum with conspicuous sparse white 

 hairs. Abdomen as long as the thorax, sessile; first segment the 

 longest, slightly exceeding the combined leng-th of the second and 

 third segments together; second to fourth increasing in length; fifth 

 much shorter; sixth triangular, beset with stiff black hairs which 

 also extend to the underside of the fifth laterally. Ovipositor when 

 fully exserted over half as long as the abdomen ; its downwardly curved 

 spatulate tip short and the only part visible when the ovipositor is 

 retracted. Legs yellowish brown, the hind femora more or less infus- 

 cated and the tarsi luteous. In some specimens the legs are almost 

 entirely fuscous. Anterior femora thickened and with a blunt pro- 

 jection inwardly near their apical third. Hind femora quite broad, 

 but simple; hind tibiae with conspicuous stiff hairs. Wings hyaline, 

 with two large fuscous spots on each anterior wing ; basal spot nearly 

 quadrate, extending about two thirds across the wing and ending 

 anteriorly just before the tip of the submarginal vein ; apical spot just 

 encompassing the stigmal vein, reaching half way across the wing 

 and nearly twice as long as wide along the axis of the wing. Mar- 

 ginal vein half as long as the submarginal and slightly exceeding the 

 subequal postmarginal and stigmal veins. Stigmal vein slightly curved 

 upwards at the tip where it bears a rather large oval knob. 



Six female specimens reared by Mr. Walter Postiff of the 

 Bureau of Entomology from a peach bark-beetle, probably Phlceo- 

 tribus liminaris Harr. at Doug-las, Michigan. 



The specimens are quite close to the common and widespread 

 European C. colon Linn, but are uniformly darker on the legs 



