310 NOTES ON BUMBLEBEES 



One paratopotype queen deposited in the collections of each 

 of the following institutions: American Entomological Society, 

 American Museum of Natural History and the United States 

 National Museum. Holotype and remaining paratopotype 

 queens in the collection of the author. 



I name this variety for my friend Dr. F. E. Lutz, who has done 

 a great deal to increase our knowledge of the bumblebees. 



Variety lutzi differs from the typical sylvicola from Alaska, 

 northern Canada and Labrador, as described by Franklin, as 

 follows : the face is dominantly black as well as the lower half of 

 the mesopleura, the metapleura, and the median segment. The 

 black pubescence on the middle dorsal area of segments two, 

 three and four is often so pronounced as to form a distinct longi- 

 tudinal band, sharply dividing the dominant yellow and fer- 

 ruginous pubescence of these segments. The yellow pile is of a 

 duller hue than in most specimens of sylvicola that I have studied 

 from Alaska, Canadian Northwest Territories and Labrador. In 

 several specimens of variety lutzi the pile on the fourth dorsal 

 abdominal segment is whitish. Another difference l)etwepn the 

 typical sylvicola and variety lutzi is that in the former the fifth 

 dorsal abdominal segment usually has some yellow pile, whereas 

 in the latter this segment is entirely black or mainly so. Variety 

 lutzi also differs from the melanic variety johanseni Sladen of 

 sylvicola, described in 1919, in having a greater amount of yellow 

 pile on the upper portion of the pleura of the thorax, and the fourth 

 dorsal abdominal segment being largely yellow. Variety johan- 

 seni is known only from the type localities of Bernard Harbour, 

 Northwest Territories, Coronation Gulf and Herschel Island, 

 Yukon Territory. 



I am considering lutzi to l)e a variety of sylvicola on (he basis 

 of the color pattern and structural characters presented by the 

 queens. There is a possibility, however, that lutzi may prove 

 to be a southern species of the sylvicola comjilex. Males are 

 needed to decide definitely this problem of systematic- position. 



The presence of a variety of sylvicola or a mein])er of the 

 sylvicola c()in])lcx in Arizona exiends ('onsideral)ly tli(> soulhward 

 range of this speci(\s, and reopens the discussion as to th(> presence 

 of sylvicola in the United States. The first^ record of this s])ecies 

 from the United States is that of Cresson in 1S79, wIumi he listed 



