NORTH AMERICAN HYMENOPTERA. 247 



the macula deeply emarginate anteriorly and posteriorly, narrowest towards the 

 hase of the segment and slightly emarginate at the sides, the posterior angles 

 rounded ; the third and following segments covered with very pale golden pu- 

 bescence, the fourth having a central patch of black pubescence ; beneath, the 

 margins of the segments ciliated with silvery pubescence. Length 17 mm. 

 Hab. — Mexico. 



Spliaerophthalma quaclriclens Blake. 



Female. — Black ; head quadrate, double the width of thorax, posterior angles 

 acute, face densely rugose, vertex clothed with pale golden pubescence, cheeks 

 prominent, deeply punctured, bearing beneath two strong spines, curved forward, 

 in front of these, behind the mandibles, are two shorter ones, head below clothed 

 with long glittering hairs ; mandibles black, polished, stout, with two teeth before 

 the apex ; antennas black, scape clothed with long, pale, golden pubescence, fla- 

 gellum dark ferruginous in front ; eyes moderately prominent, rounded ; thorax 

 subquadrate, slightly constricted, rugose, prothorax with a stout tubercle on each 

 side posteriorly, disc of mesothorax clothed with pale golden pubescence ; meta- 

 thorax roundly truncate, flanks polished, very thinly sericeous: legs black, pol- 

 ished, clothed with long glittering hairs, the intermediate and posterior tibia? 

 armed exteriorly with a row of spines, calcaria long, black ; abdomen ovate, basal 

 segment nodose, second segment having an ovate spot of deep golden pubescence 

 on the disc, apical margins of segments thinly fringed with long pale hairs ; under 

 side shining, punctured, thinly clothed with pale glittering hairs. Length 19 mm. 



Hab. — Panama (H. Strecker). This species is allied to Robinsonii 

 and capitata, but is readily distinguished from the former by the ovate 

 spot on second abdominal segment, and from the latter by the size 

 of the head. 



Splirerophtlialma Gabbii Blake. 



Female. — Black ; head subquadrate, as wide as thorax, posterior angles rounded, 

 densely rugose, sparsely clothed with erect black hairs ; above the eyes on ver- 

 tex are two ovate spots of appressed pale golden pubescence, cheeks prominent, 

 coarsely, confluently punctured ; mandibles black, mouth clothed with pale yel- 

 lowish hairs; scape of antenna? clothed with pale golden pubescence, flagellum 

 slightly pruinose ; eyes prominent, round, polished ; thorax subquadrate, nar- 

 rowed posteriorly, densely rugose, anterior angles of prothorax armed with a 

 short tooth ; disc of mesothorax bearing a transverse band of pale golden pubes- 

 cence, anterior angles produced into acute teeth, flanks deeply excavate, filled 

 with pale pubescence below, above which they are polished ; metathorax roundly 

 .truncate, with an obtuse tooth on each side anteriorly, disc having on each side 

 an elongate ovate stripe of pale golden pubescence ; legs clothed with pale yel- 

 lowish hairs, calcaria pale ; abdomen elongate ovate, basal segment having two 

 lateral patches of pale golden pubescence, second finely rugose, the dorsal surface 

 bearing numerous, minute, longitudinal, parallel carina?; on the disc are two 

 round, yellow spots and two lateral stripes, thinly clothed with pale golden pu- 

 bescence ; apical segments black at middle, sides clothed with golden pubescence ; 

 under side black, second segment moderately coarsely punctured with a lateral 

 oblique stripe, and apical margins of all the segments clothed with silvery pu- 

 bescence ; anterior margins of all finely aciculate. Length 18 mm. 



Hab. — Costa Rica. Two specimens ; collected by the late W. M. 

 Gabb. 



