AMERICAN HYMENOPTERA. 329 



114. Brachycistis cremastogast-er sp. nov. 



Male. Head castaneus; thorax, abdomen, legs and antenna; pale rufous, 

 pubescence rather sparse, dusky; ocelli large, the hind ones nearer the eyes than 

 their diameter, the distance between them twice their diameter, their hind edges 

 connected by a deeply impressed line; clypens slightly and broadly produced at 

 the middle; antennal scape snbequal to length of flagellar joints, punctures of 

 head sparse and fine, occiput but little produced and truncate. Mesonotum and 

 scutellum with fine scattered punctures, mesosternal punctures slightly stronger, 

 mesopleural punctures close; metatborax smooth above, very slightly roughened, 

 almost smooth, posteriorly. Petiole of abdomen cam pan u late, strongly nodose, 

 depressed above, constricted from the second segment, but little longer than its 

 greatest breadth, impunctate except for a set of close punctures posteriorly on 

 the sides, ventral segments somewhat darker. Femora rufo-castaneous, tibise and 

 tarsi more or less pale. Wings clear hyaline, veins testaceous, stigma fuscous, 

 marginal cell somewhat more than two-thirds the length of the stigma, second 

 submarginal triangular, its sides ending near the base of the marginal, its length 

 on the cubital less than the length of the trapezoidal third cell, third submargi- 

 nal longer than high. 

 Length, 10 nam. 



Two specimens, indefinitely labelled " Texas," from the Andrew 

 Bolter collection in the Chicago Academy of Science. 



This species will lead to triangularis Fox in Mr. Fox's table, but 

 it differs from the description of that species thus: pubescence 

 sparse, almost wanting; metatborax nearly smooth ; petiole impunc- 

 tate except posteriorly on the sides, where it is finely punctured ; 

 third submarginal longer than high and longer than the second. 

 The head is darker, and the size much larger. 



115. Brachycistis Gaudii Cockerell. 



Fig. fi4 ; fore wing. 



One specimen, La Jolla, California. 



Genus MYRMOSA Latreille. 



116. Hy rmosH unicolor Say (1 and 4). 



Myrmosa unicolor Say. % . 



Myrmosa thoracica Blake. 9 . 

 The males and females occur in the same fields at Wood's Hole, 

 Mass., the males frequently hovering over the flowers, the females 

 running about on ground riddled by the nests of Halictus. The 

 females were common throughout the present summer in a gravel 

 pit in Lake County, 111. The ground here was riddled with nests 

 of Halictus spp. and various wasps. See fig. 66 for venation. 



Genus JIETHOCA Latreille. 



117. Methoca stygia Say (1). 



Fig. 65 ; wing. 

 Not rare on Umbelliferous flowers at Wood's Hole, Mass. 



TRANS. AM. ENT. SOC, XXIX. (42) OCTOBER. 1903. 



