THE CANADIAN ENTOMOLOGIST. 



325 



26. Leionotus anormis (taos). — May 31, Oct. 29. 



27. " fundatus. — Jane 25, July 19. 



28. " arvetisis. — Aug. 2. 



29. " foraminatus. — Aug. 13. 



30. " pedestris. — July 6. 



ORLANDO, FLA. 



31. " fimdatiforniis. — Feb. 17. 



INVERNESS, FLA. 



32. " hifurcus. — March 3. 



33. " turpis. — March 19. 



34. Ancistrocerus ///.y/^w.- -March 20, 24. 



35. Odynerus erynnys. — Feb. 10, March 10, 25. 



TEXAS, BELFRAGE. 



36. Trachandrena verecunda. — Cresson, in Col. Am. Ent. Soc. Types. 



The following host species, followed by the number of species of 

 flowers on which each was taken, have not been observed to be infested 

 at Cailinville : 



Eumenidse — Monobia qimdridens, \2 ; Ancistrocerus campestris, i^. 



Vespidse. — Polistes afimilaris, 20; P, ?neiricus, 43; P. rtibiginostis, 18. 



Sphecidae. — Proterosphex pennsylvanicus, 13 ; Priononyxa atrata^ 

 38 ; Sphex intercept a, 52 ; .S". procera, 35. 



Halictidse. — Chloralictus aibipennis, 17. 



Andrenidse. — Andrena corni, i; A. Nasonii, 14; A. nubicu/a, t ; 

 Opandrena bipunctata, 2)C) '> 0- Cressonii, 54 ; O. Robert sonii, 7 ; 

 Ptilandrena Polemonii, 3 ; Pterandrena solidaginis, 14. 



The determination of Ptilandrena Polemofiii, which Pierce marks 

 doubtful, is probably incorrect. Andrena illinoensis is probably incorrectly 

 determined, though it is a Stylops host. After I described A. illinoensis I 

 mixed salictaria with it, and I may have sent out this species under the 

 former name. I have suspected that the bee identified as Chloralictus 

 aibipennis might be nymphcearum. And it seems strange that I should 

 find Pterandrena asteris stylopized, but not P. solidaginis. Nevertheless, 

 it is evident that the geographical range of the Strepsiptera is not so closely 

 correlated with that of the hosts as might be expected, if every parasite is 

 a distinct species. In Florida, where I observed only 22 flower-visits of 

 Odynerini, I found 5 infested species, while in Illinois I fotind only 8, 

 after observing 339 flower-visits, 



