210 Mr. T. D. A. Cockerell on 
joint of antenne longer than fourth; transverso-medial 
nervure meeting basal, but a little on the externo-medial 
side. 
g.—Length about 9 millim., but more slender. 
Differs from the male of N. modesta (a Colorado specimen 
sent by Mr. Fox compared) as follows:—Ventral surface of 
abdomen with no pale bands, but only four very inconspicuous 
short pale lines, on segments 3 and 4; yellow markings 
paler ; no yellow spots on metathorax ; band on second abdo- 
minal segment more narrowed in the middle; apical plate 
only feebly notched ; legs red, the only light markings being 
cream-coloured spots on hind coxe and hind tibize at apex ; 
wings with a more distinct apical cloud. 
Perhaps I ought to regard this as a subspecies of JV. tex- 
ana, but, though very close, it is readily distinguishable, and 
no intermediate specimens have been seen. 
Hab. Deming, New Mexico, at flowers of Verbesina ence- 
lioides, July 9 (Cockerell); Rincon, N. M., at flowers of 
Prosopis glandulosa, July 5 (Cockerell). The first-mentioned 
locality produced the female, the second the male. 
It is rather remarkable that in the N. modesta series the 
southern forms differ from the northern by the absence of the 
spots on the metathorax; thus, on the Pacific coast, the 
southern LV. formula, Viereck, is essentially N. swavs without 
the metathoracic spots. I had arrived at this conclusion from 
a study of N. formula and the description of suavis ; 
Mr. Viereck has now confirmed it by comparing the actual 
types. 
Nomada grindelie, sp. nu. 
¢ .—Length about 63 millim. 
Shining black, entirely without markings, but with short 
silvery-white hair, dense on face, labrum, pleura, middle and 
hind tibie, and patches at sides of abdomen. Mandibles 
largely ferruginous, simple, but broad at end. yes greyish 
black ; facial quadrangle practically square ; flagellum short 
and stout; third antennal joint longer than fourth; sides of 
vertex and of mesothorax smooth and shining; tegule dark 
brown. Wings nearly clear, with the apical margin broadly 
dusky ; stigma black; transverso-medial nervure meeting 
basal ; abdomen smooth and shining ; apical plate broad and 
rounded, not in the least notched. 
Allied to N. pilosula, Cresson, but the front is not narrowed 
above and the size is smaller. 
Hab, Lincoln, Nebraska, on Grindelia flowers, Sept. 2, 
1901 (J. C. Crauford). 
Received from Mr. Viereck. 
