20 Prof. J. W. Gregory on the 



with sparse punctures ; the abdomen is impunctate. The 

 anal fimbria is greyish brown. The enclosure of the meta- 

 thorax is granular and ill-defined. Tarsi dark in both sexes. 



I had thought it possible that this might be Andrena tri- 

 zonata (Ashmead, as Cilissa) , so I sent a specimen to 

 Mr. Ashmead, who kindly compared it with his type, and 

 reported as follows : — " The Andrena sent is not my tri- 

 zonata, although it superficially resembles it. Your specimen 

 is slightly larger, differently sculptured, and has quite a 

 different pygidial plate. The hind legs and tarsi are also 

 differently coloured. It is quite a different insect." 



These remarks relate to the female ; the male of trizonata 

 is said to have a banded abdomen ; that of sapellonis $ is 

 shining, without bands, though the first segment, lateral hind 

 margins of the two following, and whole hind margins of the 

 rest are clothed with rather pale brown hair, which is only 

 conspicuous under a lens. 



The female sapellonis must resemble Robertson's recently 

 described A. salicacea, but it differs from the description of 

 the latter as follows: — Pubescence of thorax above ochraceous ; 

 facial grooves white, their width about as great as length of 

 first flagellar joint ; enclosure and sides of metathorax 

 rugose-reticulate, but sculptured alike ; anal fimbria pale 

 brown. A. sapellonis agrees with salicacea in the process of 

 labrum, proportions of the first three flagellar joints, fuscous 

 pubescence on tibia?, and third submarginal cell at least twice 

 as long as the second. The two doubtless are closely allied. 



Hah. Beulah, 4 ? , 1 £ at flowers of Salix, 2 ? at flowers 

 of wild plum, May 30, 1899 (W. Porter). 



Mesilla Park, New Mexico, U.S.A., 

 March 28, 1900. 



III. — On the West-Indian Species of Madrepora *. By 

 J. W. Gregory, D.Sc, F.G.S., Professor of Geology -in 

 the University of Melbourne. 



The term muricatum was first applied to West-Indian corals 



* [This paper was read before one of the London Societies in June last 

 year after a visit to the West Indies to study, amongst other questions, 

 the Madrepores of that region. The paper was withdrawn by request of 

 the Society. 



I delayed publication in order to reconsider the matter after a lew 

 months' interval. A recent letter from Mr. J. E. Duerden, of Jamaica, 



