94 Psyche [June 
lower part of pleura; also other minor details. There is a small 
red spot above each eye. The upper side of the abdomen agrees 
with that of N. angelarum Ckll. 
Nomada malonina sp. nov. 
¢o. Length about 5%4 mm.; looks at first sight like a small example of NV, 
malonella, but differs as follows: Flagellum proportionately shorter; 
lower margin of clypeus broadly yellow at sides; light parts of legs 
paler and suffused with yellowish; hind legs black except the knees, 
and apices of the other joints; t. m. a little basad of b. n.; scutellum 
less prominent; ground-color of abdomen light yellowish-red; first 
segment with more than basal half black, the edge of the black rather 
concave in the middle (projecting to form an angle in malonella) ; 
fourth and following segments dark with a subapical yellow band; 
sides of segments 2 to 4 with a broad oblique light yellow band, on 2 
and 3 with a dark patch in front; ground color of venter dark, and 
light bands much broader. In both species the apical plate is strongly 
notched. 
Hab.— Wawawai, Washington State, May 15, 1909 (W. M. 
Mann). 
The following table separates the four related species. The 
venation of N. melliventris was kindly noted for me by Mr. Viereck, 
from Cresson’s type. 
Basal nervure going far basad of transversomedial.............+-- 1. 
Basal nervure falling a little short of transversomedial............- 2. 
1. Tegule dark reddish; labrum black, except margins; scutellum promi- 
TENGE HE hee oes RE eee es SOS OTR eRe etre ee eatin Sie cane malonella ¢ 
Tegule yellowish; labrum yellow; scutellum not prominent, melliventris ¢ 
. Scape with a large red basal patch in front; ground color of abdomen 
%~ 
bright coppery-red........e cee e cece eee ence eee eeeceees elegantula ? 
Scape wholly black; ground color of abdomen pale yellowish-red 
malonina ¢ 
Nomada (Gnathias) perplexans sp. nov. 
¢. Length about 9 mm.; head and thorax black, with long coarse white 
hair, which is slightly stained with yellowish above; lower corners of 
face sending a linear process along orbits nearly to level of antenne, 
clypeus except sides above, labrum and basal half of mandibles, all 
light yellow; scape entirely black; flagellum red, the first five joints 
black above, the others with a blackish band; third antennal joint a 
little shorter than fourth; thorax densely and strongly punctured, 
