On Bees from New Mexico. 135 
EXPLANATION OF PLATE II. 
Figs. 1, 2. Youngest colony of Montipora found, 3°5 millim. in long dia- 
meter: pp, the largest and tallest calicle, presumably that of the 
parent polyp of the colony. The saucer-shaped epitheca has 
been turned in, and the outward growth at @ has been hindered ; 
hence the initial symmetry has been destroyed, the young stock 
having expanded chiefly in the direction of 4. 
Fig. 6. Diagrams showing the building up of the Montiporan corallum. 
The budding of the thick-walled polyps is shown by lines; the 
originally laminate septa and cost lying in the plane of the 
paper are covered with curved dotted lines, to represent the 
ordinary appearance of the basal streaming layer in sections at 
right angles to the growing edge. The tissue which secondarily 
thickens the corallum is :— 
(a) A reticulum which does not rise above the level of the 
calicles. 
(6) A reticulum which surges up to form spongy ramparts or 
papillee. 
(c) A reticulum of which the more vertical elements are 
straightened and thickened and project above the surface as 
tubercles. In these figures the streaming layer has been drawn 
very thick for the sake of clearness. In reality the relative 
thicknesses of the layers should be reversed, the streaming layer 
being, in many cases at least, the thinner. 
Fig. 4. Diagrams to show the different specializations in form and 
method of budding of the parent polyp, which will explain the 
leading characters of the four chief Madreporidan genera:— 
(a) Madrepora, (b) Turbinaria, (c) Astreopora, (a) Montipora. 
Fig. 5. A protuberant calicle of Anacropora gracilis (X ca. 20), showing 
the laminate septa and the edges of the costee running down the 
outer walls. 
XIJ.— Contributions from the New Mexico Biological Station. 
—VI. The New Mexico Bees of the Genus Heriades, and a 
new Halictus. By T. D. A. COCKERELL. 
Tue bees herein described all fall under Heriades in the broad 
sense, but they present considerable differences, which might 
be considered of subgeneric or even generic value. 
A. Legs partly ved. 
a. Smaller species, the red confined to the front legs. 
Heriades asteris, sp. n. 
g. Length about 5 millim. is 
Black, with the anterior femora in front and within and 
the broadened anterior tibiz behind ferruginous. The whole 
insect very coarsely sculptured, the punctures of the vertex 
and mesothorax extremely large, producing a subcancellate 
10" 
