Some Hypermetamorphic Beetles 25 



TRIUNGULOID CARRIERS 



An examination of all the insects included in the above lists 

 disclosed the fact that several of them, perhaps all, at various 

 times become temporary hosts or carriers of the Myodites triun- 

 guloids. Following are the results of the investigation : 



A lot of twenty-two Soli dago bees taken by Mr. Swenk on 

 August 8 was first examined. Not one showed signs of triun- 

 guloids. 



Under the date of August 19, .1903, Ashmeadiclla was found 

 to bear a triunguloid. {Ashmeadiclla is a mason bee living in 

 stumps, etc.) 



Under date of August 2j, 1902, twenty-six bees were exam- 

 ined, of which ten bore larvae. Four were taken on Melanomada 

 grindeliae. This bee is a parasite on ground-dwelling bees and 

 will be considered later. Four were taken on Ncopasites hcli- 

 opsis ; this bee is also a parasite on ground-dwelling bees. One 

 was taken on CockercUia, a ground-dwelling bee. Nine were on 

 Epeolns, another parasite of ground-dwelling bees. One was on 

 Ccrceris, a predaceous wasp; four on Halictoidcs sp., and one 

 on Andrena solidaginis, both of which are ground-dwelling bees. 



On examining the collection of adults of Myodites itself, bet- 

 ter results were obtained, which indicate that it is probably the 

 principal carrier. Twenty-seven males were examined without 

 evidence of the larvae, and out of ninety-two females examined 

 only five bore larvae. Of these, three bore one apiece and were 

 dated August 17, 1903, August 19, 1903, August 21, 1902. One 

 collected August 24, 1901, held two; one collected August 26, 

 1901, held five. 



Having found triunguloids on bees of certain dates, the period 

 at which they might be found elsewhere was indicated. Exam- 

 inations of the buds of Solidago were made at various times. 

 On August 17 and 19, 1903, small quantities of Solidago clusters 

 were gathered, and from these twenty-two good specimens of 

 the triunguloid were found. On September 19, 1903, two larvae 

 were taken on goldenrod, one dead, the other alive. On August 

 21, 1903, several holes of Epinomia were dug out, and from the 



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