lOG 



ACARIXA. 



36. Phytoptus abnonuis, Garman— Tilia Americana L. 



37. Phytoptus acerieola, Garman— Acer saccharinum L. 



38. Pliytoptus quadripes, Sliimer— Acer saeeliarinum L. 



39. Pliytoptus ulmi, Garman— Ulmus Americana L. 

 •40. Erineum anomalum — Juglans nigra L. 



From the Ml.ove lists it will be seen that we have reiiivscutatives from 

 every orJer of insects which produce galls, except Colcoptera. 



r)oul»tless the number ,,f -all-producing hisecfs in Indiana will far 

 exceed 300 species. I sliould b,- vitv glad if members of tlu' Academy 

 will send specimens to me. Specimens may be sent either fresh or dry 

 or in formalin. Always send enough of the host plant to enable deter- 

 mination. 



Notes on J)eformei» K.mhrvos. 



Mf.l T. Cook. 

 It is well l<nown tli;it cMremes of tenipcr;itniv will proiluce malformed 

 embry.ts. but it is also pr..bal>le tliat ni:ill'onna1 ions may result from 

 other causes. 



La.st spring the students in n.y class in embi-yology found a very large 

 number of deformed clii,-i< eniliryos. The most .•ouunon malformation 

 was two or more blastoderms, but in many c.-ises the emlirvos did not 



/ 





develop beyond the formation of the jirinutive streak. The farthest 

 developed and most remai'kable defornuty was in the case of two embryos 

 .so placed that anterior ends wei-e joined and the posterior ends extending 

 ui opposite directions. .Judging from the mesoblastic somites, the em- 



