THE CANADIAN ENTOMOLOGIST 411 



Helianthus, scattered about. The D. afflicta carried only a little 

 pollen on the legs, but it also had both sorts, and Helianthus 

 grains also on the wings. 1 



We must probably conclude that these species of Diadasia, 

 regularly visiting Cactacea? for nectar and pollen, rested from time 

 to time on the discs of Helianthus, and accidently became dusted 

 with pollen from these. In this way, without actually feeding on 

 Helianthus, these bees might become pollinating agents. 



We are almost without records of sunflower visitors in the 

 Pacific coast region, and I have no data from Central and South 

 America, although rather numerous species of Helianthus exist in 

 the mountains from Mexico to Peru. Graenicher in Wisconsin 

 and Robertson in Illinois have made many observations of interest 

 on the visitors of the perennial species. Records from Canada, 

 the Atlantic seaboard and the Southern States are much to be 

 desired. The Entomologists of the U. S. Department of Agriculture 

 stationed in Texas have secured .enormous series of insects of all 

 orders, including a considerable number from Helianthus, but the 

 labels do not, as a rule, show what species of Helianthus are 

 involved. I have been very kindly permitted to examine many of 

 the bees, and also to use the records kept on file in Washington.. 

 I give here some illustrative data: 



(1.) Dallas; Sept. 21, 1905. At H. maximiliani. C. R. Jones. 



Nomia nortoni Cr., det. Crawford; Halictus armaliceps Cr. 



(ligatus Auctt.); Megachile parallels Sm. 

 (2.) Clarendon; Aug. 11, 1905. At sunflower. C. R. Jones. 



Perdita xanthismce Ckll.; Triepeolus remigatus (Fabr.), det. 



Bishopp; Melissodes obliqua Say. 



(3.) Victoria; October 2. At Helianthus. Crawford and Leister. 

 Nomia heteropoda Say.; TV. apacha Cr. 



(4.) Wichita Falls; June 10, at Helianthus. J. D. Mitchell. 

 Nomia bolliana Ckll. 



(5.) Falfurrias; May 18, at Helianthus. A. C. Morgan. , Nomada 

 garchna Ckll.; N. texana Cr.; Osmia subfasciata Cr., o"; 

 Melisodes suffusa Cr., cf ; Anthophorula margani Ckll.; 

 Halictus ligatus Auctt. (det. Crawford); and other species 

 recorded elsewhere in this paper. 



