THE BLACK HALICTINE BEES OF THE 

 PHILIPPINE ISLANDS 



By T. D. A. COCKERELL 



Of the University of Colorado 



The black halictine bees of the Philippines have all been 

 referred to the genus Halictus; but the subgenus Nesohalictus, 

 of Crawford, remarkable for its very long tongue, may be ele- 

 vated to generic rank. 



Genus NESOHALICTUS Crawford 



Halictus subgenus Nesohalictus Crawford, Proc. U. S. Nat. Mus. 38 

 (1910) 120. 

 "Closely resembles Halictus, but differs by the greatly elongate tongue, 

 which is about as long as the antennae, by having the inner spur of the 

 hind tibiae in the male armed with a few large teeth, and by having all 

 the transverso-cubital veins, the cubitus beyond the second transverse 

 cubital, and the upper two-thirds of the second recurrent vein, obsolescent." 

 (Crawford.) This diagnosis was based on the male. 



The female is larger (about 7.5 millimeters long), with the 

 basitarsi piceous (they are ferruginous in the male) ; the hind 

 spur has long spines. On account of the long linear tongue the 

 genus is related to Thrinchostoma, but it differs in the struc- 

 ture of the hind legs, the absence of the hair patch on the wings 

 of the male, and in other ways. The clypeus of the male is en- 

 tirely black, flattened and shining in the middle. 



Nesohalictus robbii (Crawford). 



Halictus (Nesohalictus) robbii Crawford, Proc. U. S. Nat. Mus. 38 

 (1910) 120. 



Luzon, Manila (M. L. Robb and R. E. Brown) : Laguna 

 Province, Mount Maquiling (C. F. Baker), Los Baiios (Baker). 

 Panay, Antique Province, Culasi (R. C. McGregor) , June, 1918 ; 

 Maralison Island {McGregor), June 18, 1918. Mindanao, Da- 

 pitan, Davao, and Cagayan (Baker). Another species of this 

 genus, Nesohalictus lativentris (Halictus lativentris Friese), 

 occurs in Java. 



Genus HALICTUS Latreille 



The metallic species have been previously described, but one 

 described below (H. opisthochlorus) is partly metallic. The 



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