1903.] NATURAL SCIENCES OF PHILADELPHIA. 613 



outer side angled; basal nervure a little basad of transverso-medial (in 

 electa, I learn from Mr. \'iereck, it is far basad, in the manner of 

 Gnalhias); legs yellowish-ferruginous; anterior coxce with a short and 

 ]:)lunt, but very distinct, spine; abdomen shining, with minute shallow 

 l)unctures, first segment impimctate; first segment with a cloudy red- 

 dish band; second with a very broad yellow band, broadly interrupted 

 in the middle; third with a narrower band, the middle third of which 

 is wanting, and which is deeply incised sublaterally behind; fourth 

 with a band which has only a linear median interruption, but sublat- 

 erally is so deeply incised in front as to be almost interrupted; fifth 

 A\ith a very broad band, deeply incised sublaterally in front; venter 

 dark ferruginous clouded with lighter, most of the second segment 

 light. 



Hah. — Georgia, one in Coll. Acad. Nat. Sci. Phila, mixed with N. 

 electa, Mr. Yiereck informs me. By reason of the spined coxsc, it is 

 allied to N. denticuJata , Rob.. 



Nomada robertsonella, sp- n. 



9. — Length Ih mm.; bright ferruginous-red. This looks exactly 

 like A'', erythraa and N. rJioclosoma; it differs from erythra^a by having 

 the abdomen without any coppery luster, the flagellum more slender, 

 the third submarginal cell narrowed to a point above, and the second 

 submarginal greatly produced at its lower inner angle. It differs from 

 N. rhodosoma by having the third antennal joint only about half the 

 length of the fourth, the third submarginal cell narrowed to a point 

 above, and in the absence of a dark mark on the metathoracic enclosure. 

 The basal nervure is a short distance basad of the transverso-medial; 

 the first abdominal segment is without black, but has two faint dusky 

 spots on each side of the basal half; the labrum has a distinct but small 

 tubercle. 



Hab. — Nevada, one in Coll. Acad. Nat. Sci. Phila., named after Mr, 

 Charles Robertson. N. rhodosoma, Ckll., also occurs in Nevada; a 

 single female from that State is in Coll. of Acad. Nat. Sci. Phila. 



Nomada rhodosoma var. rhodosomella, var. nov. 



9 . — Smaller, length about 6 mm.; red color not so dark, more yel- 

 lowish; hindmost third of mesothorax with a black band; a black 

 stripe extending upward from region of middle coxae; a black patch 

 on each side of scutellum; no dark mark on metathoracic enclosure; 

 tegulse paler and yellower; abdomen more shining. 



Hah. — Colorado (Morrisori). One in National ]\luseum. Perhaps a 

 distinct species. I do not know the male of this form. The colors and 



