HYMENOPTERA FROM LOWER CALIFORNIA. 1 7 



line, iridescent, nervures pale-fuscous, the stigma in the 

 middle pale; abdomen testaceous, the first segment above 

 with two small lateral spots, the second basally with a 

 transverse band, which is narrowed medially, the third 

 and fourth segments with a somewhat similar band, ex- 

 cept that it is not so narrow and is interrupted medially, 

 all yellow, the apical segments clothed with pale pube- 

 scence, the last segment reddish. Length, 7 mm. 



Var. ? . — The greater part of clypeus, sides of face, 

 labrum, mandibles and anterior tarsi yellow; the two spots 

 on first abdominal segment coalesce and form a narrow 

 and sinuous band, the band on second segment not nar- 

 rowed medially. 



6 . — Much smaller than the ? ; labrum, mandibles, 

 sides of face, spot between antennse, scape and greater 

 part of flagellum entirely, yellow; the head very finely 

 and closely punctured; thorax more finely and closely 

 punctured than in the female; the metathorax also finely 

 punctured; bands on the abdomen narrower and are all 

 interrupted medially; the apex of all the femora are yel- 

 lowish. Length, 5 mm. 



Two ? and one 5 , Margarita and Magdalena Islands 

 {Haines). March. Related to alhipennis and zonalis, 

 from which it differs by the sparse punctuation of the 

 front, etc. The 3 may be distinguished from that of 

 8-macidata by the paler green of the head and thorax, 

 and by the almost entirely yellow color of the antennas. 



Perdita ventralis n. sp. 



? . — Head and thorax dark metallic green, sparsely 

 clothed with pale pubescence ; face and clypeus with fine, 

 close punctures, the punctures becoming finer on the front 

 and vertex; labrum with a pit or depression at base; the 

 cheeks at the bottom are armed with a strong, blunt tooth ; 

 frontal impressed line scarcely distinct; mandibles, except 



2d Ser., Vol. IV. ( 2 ) September 14, 1893. 



