"Journal of Entomology and Zoology, Vol. 11, No. 4, December 1919" by Various is a scientific publication produced during the early 20th century. This journal, published quarterly by the Pomona College Department of Zoology, focuses on various aspects of entomology and zoology, providing substantive research articles and notes on specific species and biological observations. The likely topics explored in this volume include the behavior of social wasps, the biology of crane-flies, and the central nervous system of certain bivalve mollusks. The contents of this specific edition include an observational study by Horace Gunthorp on the behavior of the social wasp "Polistes", detailing its emergence and subsequent activities. Charles P. Alexander contributes a detailed description of the genus "Dicranoptycha" within crane-flies, discussing their morphology and habitats, while William A. Hilton explores the neurological structures of the bivalves "Nucula" and "Malletia", comparing their nervous systems. Each section is rich with scientific detail and observational data, contributing to the broader understanding of entomological and zoological studies of the time. (This is an automatically generated summary.)