54 HENRY SKINNER, EDITOR. 



9 Length 10 mm. — Clypeus impressed along anterior margin, shining, with a 

 small central area to each side of which the punctures are well defined and sparse, 

 on the lateral margins, the clypeus is opaque with shallow closer punctures, front 

 finely striate, vertex dull. Entire thorax opaque impunctate, enclosure hardly 

 indicated. Metapleurae shining. Wings subfuseous, apex faintly clouded, nervures 

 dark brown, stigma slightly paler, the margin concolorous with nervures, first re- 

 current nervure received by the second submarginal cell just beyond the middle, 

 space between second recurrent nervure and third transverse cubitus on the cubi- 

 tus, a little shorter than space between first recurrent nervure and second trans- 

 verse cubitus on the cubitus. Abdomen mostly subopaque, pygidial area narrowly 

 rounded at apex. Pubescence of head whitish of thorax pale ochraceous, of four 

 anterior tibiae above and all tarsi brown, four anterior tibiae beneath, the posterior 

 tibiae entirely, pale brownish, of all femora paler concolorous with fringes of ven- 

 tral abdominal segments. The hair bands of dorsal segments sparse, whitish on 

 sides, the apex of abdomen brownish, dark. 



Black. Tarsi and mandibles somewhat ferruginous. 



Type. — Coll. Acad. Nat. Sciences, Phila. Type locality. — Beulah, 

 N. M., August 17, 1901 (H. Skinner). 



One 9 . Another 9 8.5 mm. long (W. P. Cockerell). 



Amlrena birtwelli Ckll. 



One 9, July 26, on Heracleum lanatum, another 9> July 26 

 (T. D. A. Cockerell). Hill above Beulah, August 15, 1900 (T. D. 

 A. and W. P. Cockerell). One 9 , June 29, 1902, oue % , June 27 

 (T. D. A. Cockerell). These specimens have an ochraceous tint to 

 the pubescence of head and thorax, all other specimens so far seen 

 by me have these parts covered with whitish pubescence. The $ 

 now first recorded has the pubescence tinted like the female com 

 inented upon, otherwise it- is the same, barring the usual sexual 

 characters; it could not be taken for anything else than the £ of 

 birtwelli. 



Amlrena sapellonis Ckll. 



Type locality. — Four 9 9 , one % at flowers of Salix, two 9 9 at 

 flowers of wild plum, May 20, 1899 (W. Porter). Oue 9 on flowers 

 of Thlaspi fendleri (T. D. A. ami W. P. Cockerell). 



Antlreiia carlini Ckll. 



May 30, one 9 on wild plum (W. P. Cockerell). 



\ ml re n a paeta n. sp. Pubescence fulvous, process of labrum truncate, 

 slightly emarginate. No median impunctate line on clypeus. Dorsulum with 

 small punctures. Enclosure of metathorax uniformly, finely roughened. Re- 

 lated to albovirgata. 



9 Length 9 mm. — Clypeus shining, deeply and strongly punctured on the disc, 



