386 Messrs. T. D. A. Cockerell and W. Porter on 



T. senescens by the supraorbital stripe being well defined and 

 continued to the nose, its much brighter colour, and white 

 uuderparts. 



Kei/ to the Species. 



A. Five black stripes T. asiaticus. 



B. Tliree black stripes. 



Supraorbital line yellowish, not clearly defined .... T. senescens. 

 Supraorbital line white, well marked T. orientalis. 



XLVI. — Contributions from the Neio Mexico Biological 

 Station. — VIII. The Neio Mexico Bees of the Genus 

 Bombus. By T. D. A. Cockerell and Wilmatte 

 Porter, 



Bombus perixanthus, sp. n. (vel Howardi, var.). 



^ . — Length about 15 millim. 



Fairly stout ; pubescence black, except at the apex of the 

 abdomen, where it is white, and on the anterior part of the 

 thorax, where it is shining lemon-yellow. With the black, 

 however, is mixed more or less yellow on the face, vertex, 

 and third abdominal segment ; while the hair on the scutellum 

 varies from entirely black to a rather dull yellow. The long 

 bri.stles on the hind tibia are mostly pale ferruginous. The 

 black hair on the abdomen occupies the first four segments, 

 the remaining segments being clothed with dirty white. 

 Wings stained with brown, but not very dark. 



Structurally this insect agrees with B. Howardi^ and it 

 may be that it is a peculiar variety of that species; but even 

 in that case it deserves a name. It is in general appearance 

 very like B. occidentalism but in that species only the first 

 three abdominal segments are black. 



Hab. Harvey's Ranch, near Las Vegas, New Mexico, 

 9600 feet, Aug. 22, 1899 {W. Porter). Also between 

 Harvey's Ranch and Beulah, on the same day. 



Bombus iridisy sp. n. 



? . — Length 17 millim. 



Broad, with black and yellow hair. Hair of face black, 

 with a little yellow intermixed, of cheeks black, of vertex 

 black in front, otherwise yellow. First joint of flagelhini 

 nearly as long as 2 and 3 together, 2 scarcely shorter than 3. 

 Thorax with dense lemon-yellow pubescence ; a broad black 



