322 NOTES ON BUMBLEBEES 



article recording the capture of P. insularis in a nest of Brenius 

 flavifrons (Cresson). As males of P. consultus were found in this 

 nest, ample evidence was provided that consultus was the male 

 of insularis. Lutz and Cockerell (1921) have wisely dropped 

 the name consultus and list under insularis all records referring 

 to the former species. 



Psithyrus variabilis (Cresson) 



A specimen contained in the collection of the Academy of 

 Natural Sciences of Philadelphia presents evidence that P. hicolor 

 Cockerell is but a color variety of P. imriahilis (Cresson). The 

 specimen in question is a female and was collected on June 16, 

 1902, at Cloudcroft, New Mexico, by H. L. Viereck. This speci- 

 men will run to hicolor in Franklin's key to the females of Psithy- 

 rus, because of the presence of some yellow pubescence on the 

 fourth dorsal abdominal segment. According to the descriptions 

 of hicolor and variabilis the only difference between them is that 

 the former has some yellow pubescence on the dorsum of the 

 abdomen. Cockerell's description was based on one female. It 

 is interesting to note that this female was collected at Rociada, 

 New Mexico, and has never been found elsewhere. Males of 

 variahilis very frequently possess a considerable amount of 

 yellow pubescence on the dorsum of the abdomen. I have also 

 seen females of variabilis from Illinois which had a slight amount 

 of yellow pubescence on the dorsum of the abdomen. The fact 

 that I can find no structural difference between this specimen 

 from New Mexico and variahilis, convinces me that hicolor is 

 merely a color variety of variahilis. 



D. A New Species from Borneo 



Bremus f olsomi new species 



Queen. Face, occiput and cheeks with brownish-black pile. Lubrum 

 moderately punctate; tuben-le-like areas large, slightly shagrccned, with the 

 space between them equal to the length of the second flagellar segment; shelf- 

 like i)rojection broad; pile on anterior margin bright golden in color. Man- 

 dible distinctly four-toothed, the fourth tooth, however, much less developed 

 than the others; setae on the distal portion between the longitudinal ridges 

 very short, dense and bright golden in color, that on the lower pro.ximal 

 portion very long and of the same color as the short setae. Clypeus with 

 numerous small punctures on the disk, and large scattered punctures mixed 



