HENRY J. FRANKLIN. 147 



" Var. c?. — Thorax entirely black; segments one and two yellow-, 

 three black-, four to six white-haired. Bolivia." 



I have here placed Friese's form in the synonymy of 

 ecuadorius entirely on the basis of these two descriptions. 



In my opinion, this species is really a variety either of 

 robushis, as Friese placed it, or of butteli. If it is really a 

 variety of robiistus, then the name ecuadorius should be placed 

 in the synonymy of that species. If, however, ecuadorms and 

 btitteli are the same species, the name butteli (1903) must go 

 into the synonymy of ecuadorius. If this species is a variety 

 of robiistus or of butteli, it belongs to the subgenus Bombias. 

 Ecuadorius may possibly, however, be a valid species by 

 itself. 



Bonibus (Bonibias) sulfuratu.s Friese. 

 Bonibus robustus var. su/furatus H. Friese, Deutsch Ent. Zeitschr., 

 1911, p. 457. 



Types. — The specimens from which Friese described this 

 form came from Salta, Argentina (2,500 meters altitude), 

 and are in his private collection. While this form is appar- 

 ently closely related to robustus, I cannot agree with Friese 

 in considering it a variety of that species, as the character of 

 the pile seems to be noticeably different. Robustus has 

 longer and finer and rather less dense pile than has this spe- 

 cies. Friese has sent me a queen and a worker of this spe- 

 cies, determined by him and collected in Argentina (Salta) 

 by Steinbach, from which the following discription is made : 



Pile of medium letigth and texture. Malar space rather short. Thorax 

 with mostly yellow pile, with black interalar band. Dorsum of abdomen 

 with first three segments and base of fourth clothed with straw-yellow 

 pile ; apical part of fourth segment rvith pale ferruginous pile ; fifth and 

 sixth segmeftts ninstly while-haired. IFings rather light. 



Queen. Head. — Face above and below bases of antennae with very 

 pale yellow and black pile mixed. Occiput with mostly black pile, 

 but with some pale yellow admixed. Sides of head behind eyes mostly 

 dark, but with a very noticeable admixture of pale yellow pile. Malar 

 space about three-fourths as long as its width at apex, about one-fifth 

 as long as eye. Clypeus, for most part, very sparsely punctate with 

 moderate punctures. Ocelli large and placed distinctly below the 

 supra-orbital line, almost exactly in the narrowest part of the vertex, 

 the lateral ones distinctly nearer to the eye margins than to each 



TRANS. AM. ENT. SOC. , XXXIX. 



