On Bees from New Mewico. 135 



EXPLANATION OF PLATE 11. 



Fii/K. 1, '2. Youngest colony of Montif.ora found, 3"o millini. in long dia- 

 meter : pp, the largest and tallest calicle, presumably that of the 

 uarent polyp of the colony. Tlie saucor-shapcd epitheca has 

 been turned in, and the outward growtli at a lias been hindered ; 

 henco the initial .-yniniftry has bren destroyed, the young stock 

 having expanded chieliy in the direction of h. 

 Fig, ■'>. Diagrams showing tlie Iniildiug up of the Montiporan coralluni. 

 The budding of the thick-walled polyps is sliown by lines; the 

 originally laminate septa and costio lying in the plane of the 

 paper are covered with curved dotted lines, tu represent the 

 ordinary appearance of the basal streaming laj'er in sections at 

 right angl(\s to the growing edge. The tissue which secondarily 

 thickens the coralhim is: — 



(rt) A reticulum -which does not rise above the level of the 

 calicles. 



{!)) A reticulum which surges up to form spongy ramparts or 

 papillae. 



(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 buddinji: of the parent polyp, which will explain the 

 leading characters of the four chief Madreporidan genera: — 

 (a) Madrepora, (b) Turhinaria, (c) Astneoponi, (d) M(mtipora. 

 Fiy. 5. A protuberant calicle of Aiiacropora gracilis ( X ca. I'Oj, showing 

 the laminate septa and the edges of the costae running down the 

 outer walls. 



XII. — Conirihutions from the New Mexico Biological Station. 

 — VI. The New Mexico Bees of the Genus Heriades, and a 

 neic Halictus. By T. D. A. Cockerell. 



The bees herein described all fall tinder Heriades m the broad 

 sense, but they present considerable differences, which might 

 be considered of subgeneric or even generic value. 



A. Legs partly red. 



a. Smaller species, the red confined to the front legs. 



Heriades asterisj sp. n. 



J . Length about 5 millim. 



Black, with the anterior femora in front and within and 

 the broadened anterior tibiae behind ferruginous. The whole 

 insect very coarsely sculptured, the punctures of the vertex 

 and mesothorax extremely large, producing a subcancellate 



10* 



