Records of Bees. 131 



Perdita Rehni, sp. n. 



¥ . — Length about 4^ mm. 



Ill the table of New Mexico Perdita runs to P. pallidior, 

 but is easily distinguished from that species by the smaller 

 size, much darker abdomen, colour of antennse, &c. Head 

 and thorax yellowish green, the mesothorax dullish (not 

 brilliantly polished, as it is in many species) ; head small ; 

 front shining green ; clypeus and supraclypeal area purplish 

 black ; the only pale face-marks are the small L-shaped pale 

 yellowish lateral marks^ which send a very fine broken line 

 up the orbital margin to a little above level of antenna?. 

 Mandibles whitish ; cheeks dark, with white hair. Antenna 

 dark above, pale yellowish beneath, the dark more prominent 

 than the light; border of prothorax and tubercles light 

 yellow; pleura all dark. Anterior legs entirely light yellow, 

 or the teraora may have a brown patch, and the tibiae a line, 

 behind ; middle femora all light yellow, bat the tibire mainly 

 brown on outer side and the tarsi somewhat darkened ; hind 

 femora with the apical half above dark brown and their tibiiB 

 and tarsi brown ; nervures colourless, but stigma margined 

 with brown ; marginal cell with the substigmatal portion 

 much the longest ; third discoidal distinct. Abdomen above 

 dark brown, the first segment with a transverse light yellow 

 discal mark ; segments 2 to 4 each with a basal light yellow 

 band, but the bands on 3 and 4 may be nearly concealed by 

 the retraction of the segments, giving the appearance of a 

 one-banded abdomen ; fifth segment, apex, and ventral surface 

 reddish yellow. Sometimes the fifth segment has a very 

 broad yellow band on a dark ground, or it may be all dark. 



Hah. Alamogordo, New Mexico, June 9, 1902 (//. L. 

 Viereck) . 



Named after Mr. Relin, the well-known orthopterlst and 

 mammalogist, who was Mr. Viereck's companion on the 1902 

 expedition. 



Prosopis Cressoni, n. n. 



Prosopis pygnifea, Cresson, Proc. Boston Soc. Nat. Hist. xii. (18<)9) 

 p. 272 (Illinois). — Not P. pyyitK^a, Schonck, 1853. 



Nomada Jlavoguttata AJfheni^ n. n. 



Nomadn pi/fpncsa, Schenck, Berlin, ent. Zeits. xviii. (1874) p. 342. — 

 Not N. pyguKea, Cresson, 1863. 



9* 



