128 THE CANADIAN ENTOMOLOGIST 



the case of several species of Pontania. It is suggested that the 

 curious power of the excrement of such sawfly larvae to induce 

 cell proliferation is possibly due to their having swallowed tissues 

 still containing these enzymes, which have retained their stimulat- 

 ing power, even after having passed through the intestinal tract 

 of the larva. 



The work, which should be in the hands of every student of 

 insect galls, is beautifully illustrated by thirteen heliotype plates 

 from photomicrographs of sections of the various galls described 

 in the text. There are also a few good text figures. 



Contributions to the Natural History of the Lepidoptera 

 OF North America. Parts IV., V. and VI. By Dr. Wm. 

 Barnes and Dr. J. H. McDunnough. 



Three more parts of this valuable publication, by Dr. Barnes 

 and Dr. McDunnough, have appeared, bearing dates of July, 1912. 

 Part IV. is entitled, "Illustrations of Rare and Typical Lepidop- 

 tera," and contains 27 plates, reproduced by half-tone process from 

 photographs, which present in all 506 figures. Most of these are 

 of moths which have not previously been figured, and a large per- 

 centage are the actual types, so the usefulness of the work to stu- 

 dents will be realized. The text, 54 pages, and index is mostly 

 an explanation of the figures, with locality of the specimens shown, 

 but in some cases additional notes are given. 



Part V. — "Fifty New Species: Notes on the Genus Alpheias" 

 — contains 44 pages of text, three half-tone plates showing 62 

 figures of types and cotypes of the species described, one plate of 

 genitalia and one of venation. The new species are from Arizona, 

 California, New Mexico, Texas and Utah. 



Part VI. is of 13 pages "On the Generic Types of N.A. Diurnal 

 Lepidoptera," and deals with one of the many phases of the vexa- 

 tious muddles which entomological nomenclature, at present, is in, 

 but it seems probable that the International Congress of Ento- 

 mology will be able before long to overcome many of the diffi- 

 culties that make it so easy to keep generic and specific names in 

 a constant s'talitfe of chaos. A. F. Winn. 



Mailed April 16th, 1913. 



