1865] * 117 



dusky. Abdomen : basal segment generally black, immaculate, some- 

 times wholly or in part ferruginous, as well as spots on extreme sides 

 of the remaining segments; second segment with a broad, apical, yel- 

 low band, rounded on each side anteriorly and more or less deeply 

 emarginated in the middle; the four following segments each with a 

 narrow apical yellow fascia, sometimes a little dilated on the sides ; 

 apical segment flattened, sparsely and deeply punctured, subtruncate 

 at tip, and with a lateral tuft of dense golden pubescence ; in one spe- 

 cimen the upper surface of this segment is fulvous, and the four pos- 

 terior femora not stained with black within; venter generally black, 

 sometimes more or less stained with fulvous. Length 8 lines ; expanse 

 of wings 12? lines. 



Hal). — New York (Angus) ; New Jersey, Pennsylvania (Cresson) ; 

 Illinois (Dr. Lewis) ; Kansas (Dr. Wilson) ; Louisiana (Keunicott). 

 Coll. Ent. Soc. Philad, and Chicago xlcademy of Sciences. 



Ten % specimens ; $ unknown. A large well marked species, with 

 the ornamentation of the thorax and abdomen somewhat similar to that 

 of C. rlt/pcata 9 . 



4. Cerceris bicornuta, Guer. 



Ccfceris bicornuta, Guer., Icon. Reg. Anim. p. 44:3 ; Smith, Brit. Mus. Cat. 

 Hym. iv, p. 466. 



Black, often more or less varied with ferruginous : orbits, postscutellum 

 and band or two spots on first and second abdominal segments, yellow ; legs 

 fulvous ; wings fuscous. 



Female. — Black, deeply and rather closely punctured, clothed with 

 a short golden pubescence, whitish on the metathorax ; most of the 

 cheeks and occiput, clypeu.s, and mandibles except tips, ferruginous; 

 the frontal orbits more or less obscure yellowish, as well as the carini- 

 form process between the antennte; middle lobe of the clypeus lunate, 

 not very prominent, the lower half concave and polished, the angles of 

 the lunate projection short and subacute, apical margin of the clypeus 

 uneven ; sometimes the base of the mandibles is more or less yellow ; 

 antennae ferruginous, black at tips, sometimes the flagellum is almost 

 entirely black. Thorax: abandon the collar, often interi-upted, aud 

 sometimes very indistinct, the scutellum, a large spot on each side of 

 metathorax, and the tegulae ferruginous; sometimes the scutellum and 

 metathorax are entirely black ; postscutellum yellow in all the speci- 

 mens before me ; the triangular basal space of the metathorax deeply 

 punctured on the sides, always black. Wings fuscous, rather darker 

 on the apical margins, with a violaceous reflection; nervures black. 

 Legs fulvo-ferruginous, sometimes black at base ; posterior tibiae more 



