146 AMERICAN HYMENOPTEKA. 



wrote me that, while there are specimens labelled '^ Bomb us 

 diligens'" in the collection of the British Museum, there are 

 none bearing this name which are marked as type specimens, 

 though most of Smith's types of Bomlms species can be 

 readily identified by distinguishing marks. It is therefore 

 possible that Smith's type of diligens cannot be identified, 

 though still extant. If this is the case, brachycephahis must 

 stand permanently as the name of this species, even if Smith 

 described this species, and not dolichocephalus, as diligens. 



Bombus (Boinbias?) ecuadoriiis Meun. 

 Bombus Ecuadorius Meunier, Journ. Sc. Lisboa, (2), II, 1890, p. 66, 9 . 



" ecuadorius Dalla Torre, Cat. Hym., X, 1896, p. 518. 

 ? " robustus var. nigrothoracicus H. Friese, Zeitsch. f. Systemat. 

 Hym. und Dipt., IV Jahrg., Heft 3, May 1, 1904, 

 p. 188, (f . 



I have not seen specimens of this species. The original 

 description reads as follows : 



" Bombus ecuadorius nov. sp. — Black, pubescence of thorax black ; 

 segments one and two yellow, the third covered with black pubescence, 

 the fourth to sixth segments with white hair. Venter pale brown. 

 Feet black, with black pubescence. Wings entirely tawny iridescent. 

 Length 23 mm. 



Head a little elongate, the pubescence black. Clypeus shining, its 

 sides strongly punctate. Labrum rounded, with numerous punctures 

 larger than those on the clypeus. Mandibles rather slender, their 

 bases considerably removed from the eyes. 



Thorax with black pubescence. Sides of mesothorax strongly punc- 

 tate ; the disc shining, with punctures sparse. Scutellum sparsely 

 punctate. Abdomen with the first and second segments yellow, the 

 third black, the fourth, fifth and sixth white. The first segment not 

 punctate, the second densely punctate, with gloomy aspect. 



The punctures of segments four, five and six are scattered and the 

 surface is shining. Sixth dorsal segment concaved in the middle, cal- 

 loused at the apex. Venter densely and deeply punctate. Sixth ven- 

 tral segment without particular characters. 



Feet black, their pubescence black. Bases of the hind femora punc- 

 tate, their apices very feebly and obliquely striated. 



Wings entirely tawny, with metallic reflections. 



Very rare and captured by missionary Boetzkeo at Quito, at an alti- 

 tude of 2,000 meters above the level of the ocean." 



Friese's description of robtisius var. nigrothoracictis is as 

 follows : 



