130 HYMENOPTEKA. 



EUCERCERIS. 



Eucerceris, Cresson, Proc. Ent. Soc. Phil. v. p. 104 (1865). 



Eucerceris has, according to Cresson, " the third cubital cellule very large, subquad- 

 rate, scarcely narrowed towards the radial cellule, and extending beyond it, and without 

 a sinus between them ; the second cubital cellule triangular, sometimes petiolate in the 

 female ; the radial cellule obtusely truncate at the apex ; the first abdominal segment 

 narrowed as in Cerceris ; and the neuration of the anterior wings generally dissimilar 

 in the sexes." I feel inclined to regard it as a subsection of Cerceris. Fifteen North- 

 American species are known. 

 I 



v l. Eucerceris cerceriformis. 



Nigra, facie, linea pronoti, linea scutelli, metanoto, abdominis segmentis marginibus, maculisque 2 segmento 

 mediali, albidis; pedibus fulvis, geniculis tibiisque anterioribus albis; alis byalinis, antieis fumatis, 

 stigmate ochraceo. § . 



Long. 10 millim. 



Hab. Mexico {coll. Saussure). 



Antennae with the flagellum brownish beneath, gradually thickened towards the 



apex; the third joint somewhat longer than the first, and nearly four times the length 



of the second. Head shining, closely and not very strongly punctured ; from below the 



ocelli it is entirely whitish-yellow, and there is an elongated mark behind the eyes ; 



a black elongated fossulet above the eyes, and a short furrow between these fossulets ; 



ocelli separated from the eyes by somewhat less than the length of the third antennal 



joint; apex of the clypeus broadly rounded ; eyes diverging a little below. Thorax 



rather strongly punctured ; the pleurae rugose, the heart-shaped area of the median 



segment transversely striated, widely furrowed down the centre ; a broad line on the 



pronotum, the tegulse, the tubercles, a mark behind them, a broad complete line at the 



base of the scutellum, the metanotum, two large marks on the median segment, and a 



broad band on the abdominal segments, yellowish-white. Abdomen shining, bearing 



scattered punctures ; the pygidial area with some large punctures at the base, its sides 



curved, hollowed, ending as stout, somewhat triangular, teeth, and with a few large 



widely separated punctures ; incision in the hypopygium short ; there is a depression 



in the centre of the antepenultimate segment, and a row of stiff longish bristles at 



its base. 



PHILANTHUS. 



Philanthus, Fabricius, Ent. Syst., Suppl. p. 268 (1793) ; Syst. Piez. p. 301. 

 Simblephilus, Jurine, Nouv. Meth. de Class, les Hymen, p. 185 (1807). 

 Trachypus, Klug, in Ges. naturf. Fr. Berl. Mag. iv. p. 41 (1810). 

 Anthophilus, Dahlbom, Hymen. Eur. i. p. 496 (1845). 

 Philanthocephalus, Cameron, antea, p. 86. 



A genus somewhat numerously represented in the Nearctic Region, but apparently 

 possessing fewer species in the Neotropical. 



