NORTH AMERICAN HYMENOPTERA. 235 



Closely resembles *S'. Cressoni, but is readily distinguished by the 

 bauds on the thorax and by the less robust form. 

 Spliaerophtlialina toliiea Blake. 



Female.— B\a.c'k ; head rounded, clothed with dense, pale, ochraceous pubes- 

 cence; antennse black; eyes round, prominent; thorax ovate, narrowed poste- 

 riorly, clothed with coarse, black, meso- and metathorax with coarse 

 ochraceous pubescence, sides of the latter black, abruptly truncate ; 

 legs black, clothed with scattered glittering hairs, intermediate and 

 posterior tibise armed with spines; abdomen ovate, basal segment 

 clothed with pale hairs; second segment closely punctured, having 

 two small ovate spots at the base and a broad, interually emarginate 

 band of coarse ochraceous pubescence, pointed towards the apex ; apical 

 segments clothed with similar pubescence ; under side of entire insect 

 clothed with pale hairs. Length 11 mm. 



Hab. — Mexico. Prof. F. Sumichrast. 

 Spliteroplitlialnia luteola n. sp. 



Female. — Head black, rounded, not quite as wide as the thorax, clothed on 

 vertex with pale golden pubescence, front and mouth densely, with pale luteous 

 pubescence ; eyes large, round and prominent ; antennse fuscous, cheeks finely 

 and confluently punctured ; thorax ovate, black, closely punctured, clothed above 

 with pale golden pubescence, metathorax obliquely truncate, its posterior surface 

 clothed with white pubescence ; legs nigro-ca.staneous, clothed with long, glitter- 

 ing white hairs, femora very finely and remotely punctured, intermediate and 

 posterior tibise armed with fuscous spines ; abdomen black, ovate, basal .segment 

 campanulate, short and sessile with the second, its apical margin fringed with 

 dense, pale, luteous pubescence ; second segment coarsely reticulate and clothed 

 with black pul)esceuce, its apical margin and remaining .segments densely clothed 

 with pale golden pubescence; ventral surface finely punctured, the apical mar- 

 gins fringed with white pubescence ; entire insect sparsely clothed with long 

 glittering white hairs. Length 10-12 mm. 



Hab. — Utah, Kansas. 



This species is allied to S. toluca Blake, but differs from that by 

 the absence of the pubescent spots. It may possibly pi'ove to be the 

 female of 8. jiavlda. 

 Spliteroplitlialina ariadne Blake. 



Female. — Head rounded, not quite as wide as the thorax ; black, rugose, with a 



few scattered erect hairs; antennae black; eyes round, polished; thorax short, 



suddenly narrowed behind, clothed with bright golden pubescence ; mesothorax 



with a triangular black, granulate patch ; mesothorax abruirtly trun- 



^5 cate; sides deeply compressed, coarsely punctured, clothed with sil- 



/^^ very pubescence ; legs black, clothed with scattered silvery hairs, iu- 



\^y termediate and posterior tibiae armed exteriorly with a row of spines ; 



abdomen ovate, basal segment black, its apical margin clothed with 



silvery pubescence ; second segment coarsely punctured, clothed with 



t)right golden pubescence, having on the disc a large ovate black patch 



extending to the basal margin, on each side of which is a small one of 



the same color with thin black pubescence ; apical margin black ; third 



and fourth segments clothed with dense blacJv pubescence, fifth bright golden. 



