1865.] 1-^9 



yellow ; tips of the posterior tibiae and their tarsi, fuscous. Abdomen 

 much contracted at base, the first segment small and globose, immacu- 

 late, except a fulvous dot on the apical middle ; second segment with a 

 broad, continuous, yellow baud; third segment with a short transverse 

 yellow line on each extreme side ; the three following segments with a 

 narrow subapical yellow band ; venter black, obsoletely banded with 

 obscure testaceous. Length B] lines; expanse of wings 6 lines. 



//„/^. — Louisiana. (iMr. Kobert Kennicott.) Coll. Ent. 8oc. Philad. 



One % specimen ; 9 unknown. 



25. Cerceris insolita. n. sp. 



Black; face, scape in front, two spots on collar, band on scutellum, tegulse. 

 most of legs, aud bands on abdominal segments except the second and last. 

 yellow: wings hyaline, costa fuliginous. 



]/,,/,-. — Black, closely and deeply punctured, thinly clothed with an 

 erect, palish pubescence; the face entirely, middle of mandibles, and 

 the scape in front, yellow; antennae blackish, fulvous at base and be- 

 neath. Thorax: a transverse spot on each side of the collar, tegulae, 

 broad transverse line on the scutellum, and a subobsolete dot on each 

 side of the metathorax, yellow; the postscutellum and basal space of 

 the metathorax, almost impunctate, shining. Wings hyaline, iridescent, 

 with the apical half of the costa fuliginous ; nervures fusco-ferruginous. 

 Legs yellow ; the four anterior femora behind, except tips, blackish, pos- 

 terior pair ferruginous, tips of their tibife and tarsi fuscous. Abdomen 

 with a broad, continuous, yellow band on each of the first and second 

 segments; the fourth and two following segments have each a very 

 narrow, subapical, yellow fascia; beneath, the third segment has a 

 narrow yellow band, and the two following segments a lateral spot. 

 Length 4 lines; expanse of wings 6J lines 



//„/,._Illinois. (Dr. Samuel Lewis.) Coll. Ent. Soc. Philad. 



One S specimen ; 9 unknown. Resembles the preceding but distinct 

 by the yellow face, the color of the legs, and the immaculate second 

 abdominal .se>;ment. 



The following species are unknown to me : — 



2.0. Cerceris frontata. Say. 



Cerceris frontata. Say, West. Quar. Rep. ii. p. SO. 9- 



•• Nasus elevated ; body pale rufous ; tergum yellow with rufous in- 

 cisures. 



■' Inhabits Arkansa. 



" Body pale rufous ; antennae and mandibles black at tip ; front pale 

 yellow ; nasus elevated at tip from the clypeus, widely emarginated 



