ISO.).] 127 



more or less narrowed in the middle ; beneath, the second to fifth seg- 

 ments with a lateral yellowish-white spot, the second segment stained 

 with ferruginous in one specimen. Length -1 — iJ lines ; expanse of 

 wings ()j — 7^ lines. 



//„/,._I)ela. (Dr. Wilson) ; 111. (Dr. Lewis). Coll. Ent. Soc. Philad. 



Two 9 specimens; $ unknown. A very pretty and distinct species, 

 closely allied to C. ni<jn-scens in general ornamentation, but is distin- 

 guished at once from that species by the fulvous legs. 



22. Cerceris compacta, n. sp. 



Robust, black : face, mandibles, scape in front, two spots on collar, two on 

 scutellum, tegulse, postscutellum, tibi ; and bands on second and following 

 segments of abdomen, broadest on the second, yellow; femora fulvous; wings 

 subhyaline; face silvery in 9- 



Frmnle. — Hobust, black, closely and strongly punctured, thinly 

 clothed with a pale pubescence ; face silvery, especially, on each side 

 of the clypeus ; face, a line beneath antennae, clypeus, mandibles ex- 

 cept tips, a spot behind the summit of eyes, and scape in front, yellow; 

 middle of clypeus prominent, convex above, flattened and dusky be- 

 neath, which has an ovate, oblique space on each side ; antenn;\3 black- 

 ish, the flagellum fulvous beneath. Thorax : a transverse spot on 

 each side of the collar, tegulne, a spot on each side of the scutellum, 

 the postscutellum, and in one specimen an obscure spot on each side 

 of the metathorax, yellowish, the enclosed basal space of the latter 

 coarsely and obliquely striated. Wings subhyaline, with a brassy sub- 

 iridescent reflection, the costo-apical and apical margins fuscous, ner- 

 vures dull ferruginous. Legs biack at base, the femora fulvous, their 

 tips more or less, the tibiaj and b ise of the tarsi yellow, tips of posterior 

 tibi{\) within dusky as well as most of the posterior tarsi. Abdomen 

 robust, the basal segment unusually small, aLd immaculate ; second 

 segment with a broad, continuous, apical, yellow band; the three fol- 

 lowing segments each with a narrow apical yellow fascia, much dilated 

 on the sides; beneath black, immaculate. Length 4^} — .5 lines; ex- 

 panse of wings 7 — 8^ lines. 



Male. — Resembles the female, with the face flat, of a brighter yel- 

 low, the spot behind the eyes wanting, the lateral spots of the scutel- 

 lum subobsolete, the fasciae on the third and three following segments 

 less dilated on the sides, and the venter is narrowly banded with tes- 

 taceous. Length 4 — i} lines. 



Hah. — Pennsylvania (Cresson) ; Delaware (Dr. Wilson) ; Illinois 

 (Dr. Lewis and Mr. Kennicott). Coll. Ent. Soc. Philad ,and Chicago 

 Academy of Sciences. 



