546 Mr. T. D. A. Cockerell — Descriptioyis and 



intercubitus. By the short middle teetti of abdomen it 

 resembles A. sclucarzi, Titus, but in that species the teeth 

 are red and the thorax is apparently more densely punctured. 



Mesilla Park, New Mexico, 3800 ft. alt., at flowers of 

 Dithyraa ivislizeni, Engelm., May 7 [Cockerell). 



I have long had this in my collection, mixed with A. 

 meliloti, but it is certainly distinct. At the same time, 

 place, and flowers, I also took Perdita exclamans, Ckll. 



Ashmeadiella californica (Ashmead). 



Described by Ashmead (1897) as a Chalicodoma. A male 

 before me is from Claremont, California [Baker, 7223). The 

 wings are greyish, not *' subfuscous ^' ; hair on head and 

 thorax above ochreous ; median apical teeth of abdomen 

 long. 



Heriades carinatus, Cresson. 

 ? . — Fedor, Texas [Birkman). 



Robertsonella dolichosoma, sp. n. 



$ . — Length about 7 mm. 



Black, elongate, finely punctured ; pubescence thin and 

 white, thorax above nearly bare ; abdomen with conspicuous 

 narrow white hair-bands ; ventral scopa white ; maxillary 

 palpi 4-jointed, last joint very small ; clypeus convex, 

 minutely and very densely punctured, not hairy. Antennae 

 black, flagellum stout ; a smooth shining space above each 

 antenna ; facial quadrangle longer than broad, but head 

 rather broad; front very densely and minutely punctured ; 

 thorax rather longj raesothorax and scutellum shining, finely 

 and quite closely punctured; area of metathorax dull, except 

 its descending apex, which is polished; tegulse shining black. 

 Wings dilute fuliginous ; b. n. falling a little short of 

 nervulus ; first r. n. ending a short distance from base of 

 second s.m., hardly half the distance of second r. n. from 

 apex. Legs entirely black, spurs pale reddish. Abdomen 

 shining, closely and very finely punctured, the punctures 

 practically uniform throughout. 



Mountains near Claremont, California (Bake)', 7225). 

 Easily known from the two previously described species by 

 the longer thorax and quite different sculpture of abdomen. 

 It is not Heriades albicindum, Prov., which Titus has 



