1906] 
yORlH AMERICAX RERS 
7 
species, with strongly fulvous linir on thorax; alrdomen dark green, without any 
distinct bands ; fimbria fulvous ; stigma narrow, dark red-brown ; process of 
labrum pointed ; fovea broad, pale red, adjacent to eye. Size about equal to 
vidua. Later, Mr. Viereck sent for comparison a specimen of A. scmi/iig'm, 
Vier., which proved to be exactly the same. 
.liii/iriia a/gi</a, Smith. 
? . Hudson’s Bay. Mr. Viereck sent a Philadelphia specimen of what had 
been taken for aigiiia in this country; but the real aigit/a proved to be quite a 
different species, with the following distinctive characters : larger ; facial fovea; 
short, strongly reddish, seen from above occupying only about half distance be- 
tween eye and antenna; process of labrum broadly rounded; third antennal 
joint longer ; wings not yellowish, stigma and nervures duller and darker ; abdo- 
men more hairy, the hair of the bands longer and not so dense; segments i and 
2, viewed laterally, with very conspicuous suberect hairs on hind margin ; venter 
of abdomen dark reddish-brown ; anal fimbria pale sooty ; hind tibiae, as well 
as their tarsi, dark reddish. 
In Robertson’s table, algida runs tr> A. arala's, Rob.; Mr. Viereck sent me 
anil’is to compare, and I found them closely allied, but apparently distinct. A 
arabis has hair of abdomen yellowish, aigida has it dull white, with the fimbria 
pale grey; the whole pubescence of aigida is greyish, contrasting with the 
strongly ochreous of auihis ; arab:.<: has the flagellum beneath, and the claw-joints, 
very red, which is not the case \\\ aigida ; the clypeus of seems to have 
rather larger punctures than those of aigida, though they are alike in character ; 
in the dry state the eyes of aigida are grey, of arabis black ; in arahis the basal 
joint of hind tarsi within is darkened, in aigida it is entirely pallid, with a pale 
ochreous tint. 
Andrcna fragilis, .Smith. 
Expanse of wings just over 14 mm. Runs to platyparia in Robertson’s 
tables. Compared with platxparia, I found that fragilis had the hind tarsi and 
hair at ape.x of abdomen redder, but there was no essential difference. 
Andrcna pladda. Smith. 
9. Length about 10.', mm. Fovea broad, seen from above pale recklish ; 
process of labrum remarkably long and narrow ; clyptus convex, microscopi- 
cally tessellate, with quite widely separated punctures ; disc of mesothorax dull- 
ish, with minute, well-separated punctures; metathorax truncate, the enclosure 
