590 PROCEEDINGS OF THE ACADEMY OF [Aug., 



black marks on first abdominal segment evanescent. As in ultima, 

 there is a black diamond-shaped mark on tlie metathorax. The width 

 of the face seems to vary somewhat. 



Hah. — Placita, N. M., at flowers of Taraxacum taraxacum, one, 

 May 5, 1903 {Cockerell) ; Pecos, N. M., at flowers of Fallugia acwninata 

 (F. paradoxa acuminata, Wooton), one, June 2.3 (IF. P. Cockcrell); 

 near Viveash Ranch, N. M., 8,800 feet, at flowers of Erigeron, one, July 

 21 (TF. P. Cockerell). 

 Nomada americana, Kirby. 



This species seems to have a very wide distribution; specimens in 

 the National Museum are from Canada, Colorado (with numbers 

 2,076, 2,185), and Louisiana (with numbers 2,564, 2,567, 2,420). They 

 appear to come from the Baker collection. Two in Coll. of Acad, 

 Nat. Sci. Phila., are from North Carolina. I also have the species 

 from So. Illinois (Robertson) and Baldwin, Kans., June (Bridwell). 

 It appears from the Bakerian nvunbers that this species is taken in 

 Colorado along with N. scita. Now scita has a spine on the anterior 

 coxa, and is very near to americana, though undoubtedly distinct. I 

 cannot help thinking it possible that the Colorado americana females, 

 though to all appearances genuine americana, are actually females of 

 scita.^ 



The male of N. americana is quite variable; if I had only a large 

 Canadian specimen and one of the smallest from liouisiana, I should 

 think them different species. The Louisiana males (21 examined) 

 vary greatly in size. One male is from Indiana, with number 2,003. 



Nomada martinella, sp. n. 



Q . — Length about 7 mm.; bright red. This was formerly supposed 

 to be A^. incerta = americana; but it differs in its smaller size; lighter 

 color, especially of the thorax; mesothorax without a black band; 

 face broader above; antennse and legs entirely l^right ferruginous red. 



Hob. — Mesilla Park, N. M., April 9, at flowers of plum {Cockerell, 

 2.628). Named after my little son. Two specimens were taken. A 

 supposed variety of the same species, somewhat larger (length about 

 8 mm.), with the second submarginal cell very much broader, and the 

 tegulse lighter and yellower and less punctured, was sent to me by Mr. 

 Fox as N.incerta. It is from Colorado, and if its distinctive characters 

 are constant it is presumably separable specifically. Possibly it is the 

 true female of A'', scita. A specimen from Sioux City, Neb. (Bruner, 

 29), is also referred to A^. martinella; it has the second submarginal cell 



-However, I find two males of N. americana dacotana labelled " Colo. 2,076." 



