1875.] 



485 



[Allen. 



this will best appear from a tabular statement of some of the prom- 

 inent differences; others might readily be added. 





T. pacifica. 



T. viridifasciata, var. in- 

 fuscata. 



Summit of head .... 



with a distinct median 



without a distinct median 





carina. 



carina. 



Fastigium of vertex . . 



very deeply silicate. 



moderately sulcate. 



Frontal costa 



very deeply sulcate. 



shallowly sulcate. 



Its upper extremity . . . 



strongly compressed. 



but little compressed. 



Pronotal crest 



moderately high. 



high. 



Hind border of pronotum 



right angled. 



acute angled. 



Intercalary vein of tegmina 



not touching the radial at 



uniting with the radial at 





its tip. 



its tip. 



Wings 



very narrowly clouded 



very broadly clouded near 





along the outer margin, 



the outer margin, below. 





especially above. 





Average length from front 







of head to tip of closed 







tegmina 



20 mm. 



25 mm. 



Dr. G. B. Wilder exhibited foetal specimens of the Dugong 

 and Manatee, giving a detailed description of the anatomy 

 of the former, and remarked on the affinities of the Sirenia 

 to the other mammalian orders. 



Mr. J. A. Allen exhibited a black red-headed woodpecker, 

 in which the usual area of red was preserved, while the rest 

 of the plumage was wholly an intense black, and referred 

 to the variety of melanism among birds. 



Mr. Allen also spoke of the migration of birds with spec- 

 ial reference to the observations of the Signal Service Bureau 

 published in the Monthly Weather Review. He stated that 

 he had corresponded with the officers of the Bureau respect- 

 ing an extension of these observations in the interest of biol- 

 ogy, reading a letter from Gen. Albert J. Meyer, Chief Signal 

 Officer, expressing not only his interest in the matter but 

 willingness to extend such observations as fir as his limited 

 means would allow. Mr. Allen suggested the desirability of 

 some expression on the part of the Society regarding the 

 importance of the matter; the suggestion was warmly in- 

 dorsed by Prof. Hyatt and others, and, on motion of Dr. Jef- 

 fries, referred to the Council for due action. 



