IV MONTHLY PROCEEDINGS 



Compte-Rendu Societe Entomologique de Belgique, Serie ii, Nos. 

 58 to 60. From the Society. 



First Annual Report of the United States Entomological Com- 

 mission for the year 1877, x-elating to the Rocky Mountain Locust. 

 From the Commission. 



Notes on the Aphididae of the United States, with descriptions of 

 species occurring west of the Mississippi, by C. V. Riley and J. Monell. 

 From the Authors. 



Communication preliminaire sur les mouvements et I'innervatioa 

 de I'organe central de la circulation chez les animaux articules; par 

 Felix Plateau. From the Author. 



March 14, 1879. 

 Vice-Director Dr. Horn in the chair. 



Mr. Cresson made some remarks on the structure, habits and economy 

 of species belonging to the hymenopterous family Chrysididae, and ex- 

 hibited specimens of a new species of Uuchroeus, a genus not hitherto 

 represented in North America. He characterized it as follows : 



Eucliroeus Edwardsii. — Bright metallic-green, more or less varied 

 with blue in certain lights; head rugose; apex of clypeus, mandibles and 

 flagellum, black; thorax coarsely and eonfluently punctured; postscutellum 

 with a quadrate, transversely compressed process on the disk above; wings 

 fusco-hyaline, paler at base; tarsi fuscous, pale at tips; abdomen subdepressed, 

 deeply punctured, third dorsal segment with a deep, oblique, subapical groove 

 on each side, not reaching the base of the segment, the. apical margin finely 

 and irregularly spinulose; venter piceous, polished. Length .45 inch. 



Hub. — California, (Henry Edwards). 



Mr. Blake exhibited a new species of Mutilhi from Costa Rica, col- 

 lected by the late Wm. M. Gabb, and characterized it as follows: 



9Iiltilla Ciiabbii. — 9. — Black: head subquadrate, as wide as the thorax; 

 two spots on vertex, transverse band on disk of mesothorax, two elongate spots 

 on metathorax, two on disk of second abdominal segment, and sides of apical 

 segments, clothed with a piile golden pubescence; margins of ventral segments 

 fringed with silvery hair. Length 18 mm. 



Two specimens in the collection of the American Entomological 

 Society. 



Mr. Cresson announced the completion of his Catalogue of North 

 American Apidae, enumerating 45 genera and 724 species; 601 species 

 are represented in the collection of the American Entomological Society, 

 10 are in the collections of Belfrage and Gundlach, and 113, princi- 

 pally from Mexico and the West Indies, are unknown to him. 



