116 
Psyche 
[September 
tipped hairs may occur on the mesothorax and metathorax 
(2-4 on each) and the long denticulate hairs on the lateral 
surfaces of the mature larvae may be replaced by anchor- 
tipped hairs to a total of eight per somite. No spinules on 
the ventral surface. 
Myrmica americana Weber 
Similar to emeryana except in the following details: 
Hairs about twice as numerous on the thorax and four 
times as numerous on the abdomen. Anchor-tipped hairs 
usually reduced to two per somite and restricted to ab- 
dominal somites I-V, even some of these may be replaced by 
hairs with bifid denticulate tips. Posterior surface of 
labrum more generally spinulose; posterior surface of each 
lobe with five isolated and a cluster of two to four agglomer- 
ated sensilla. Mandibles with the apical tooth more slender 
and the mesal border serrate. Labium with anterior surface 
sparsely spinulose, the spinules minute and in short trans- 
verse rows. Hypopharynx sparsely spinulose, the spinules 
minute and in widely spaced transverse rows. (Material 
studied: numerous larvae from North Dakota.) 
Tanquary, 1913, PI. LXIV, fig. 36: an embryo just before 
hatching. The ant was called M. sabuleti. 
Myrmica brevinodis Emery 
Similar to emeryana except in the following details: 
Simple body hairs attain a much greater length (0.009- 
0.25 mm), the denticulate hairs are not so short (0.072- 
0.25 mm), anchor-tipped hairs only two per somite. Pos- 
terior surface of labrum sparsely spinulose throughout, 
the spinules minute and in short transverse row basally, 
while the distal rows become arcuate and form a reticulate 
pattern ; the posterior surface of each half with two iso- 
lated and two agglomerated sensilla. Apical tooth of man- 
dible sharper and more curved medially. Labium with the 
anterior surface spinulose, the spinules in short transverse 
rows. Hypopharynx sparsely spinulose, the spinules minute 
and in a few short transverse rows. 
Male larva similar to worker larva but larger. 
(Material studied: numerous larvae from Connecticut 
and North Dakota.) 
