26 Journal New York Entomological Society. [Voi. xii. 



Proteriades may be separated from true Heriades by the absence 

 of the superior carina on first dorsal segment ; from Ashmeadiel/a by 

 the structure of the last dorsal abdominal segments. The general 

 shape and italicized characters will separate it from other described 

 genera known to me. 



One specimen deposited in U. S. National Museum. No. 6855, 



genus type. 



Genus OSMIA Panzer, 1806. 



Type. — Osmia rufa (Linne) 1758. 



This species described by Linne as Apis rufa, $ , and Apis bicornis 

 $ , was designated by Latreille in 18 10 (Consid. Gen. sur I'Ordre 

 Nat. Animaux, p. 439) as the type of the genus Osmia. 



Osmia lignaria Say, Osmia lignaria, var a, Cockerell, and Osmia 

 propinqua Cresson are the only American species I have seen which 

 belong to this genus. 



Genus MONUMETHA Cresson, '1864. 

 Type. — Monumeiha argciiti/rons Cx&sson, 1864. 



A character I have not seen mentioned in connection with this genus 

 is the presence in the center of the hind margins of the first and sec- 

 ond ventral segments of the <? of a sharp slender spine. The type 

 species is very variable in size and in amount of pubescence present. 

 A specimen collected this past summer by Mr. Rolla P. Currie at 

 Kaslo, B. C, has the abdominal fasciae all present and entire and the 

 disc of the thorax densely covered with pubescence. 



Genus ZACESTA Ashmead, 1899. 



Type. — Zacesta rufipes Ashmead, 1899, $ . 



Described from two specimens taken by Mr. D. VV. Coquillett in 

 "Los Angeles Co., Calif." U. S. National Museum, type No. 5257. 



I have examined the type specimens and the mouth parts of 

 another specimen of this species taken in the same locality by Mr. 

 Coquillett and find that // is not a megachilid. The labial palpi are 

 four-jointed, first three joints nearly equal, the second a trifle the 

 longest ; and the fourth joint distinctly shorter than either of the 

 others. Maxillary palpi six-jointed, basal joint shortest, rather stout, 

 fifth slightly longer, very slender, fourth twice as long as first and 

 slender, sixth almost as long as fourth, slender, second and third sub- 

 equal slightly shorter than sixth and moderately stout. The total 

 length of the maxillary palpus slightly exceeds that of the blade of the 



