ENTOMOLOGICAL NEWS 



AND 



PROCEEDINGS OF THE ENTOMOLOGICAL SECTION 



ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 



VOL. XXIII. 



APRIL, 1912. 



No. 4. 



CONTENTS: 



Ewing Notes on the Molting Process 

 of our common red spider fTetra- 

 nychus telarius L.) (Acarina) 145 



Neils Wing Production in Aphids 

 CHemip.) 149 



Williamson The Known Indiana So- 

 matochloras (Odonata) 152 



Blaisdell Hibernation of Cicindela se- 



nilis (Coleop.) 156 



Aldrich Flies of the Leptid genus 

 Atherix used as Food by California 

 Indians (Dipt.) 159 



Braun Notes on Chambers' species of 



Tineina (Lepid.) 163 



Busck A new Microlepidopter of the 



genus Epicallima Dyarfrom Penna. 170 



Slosson Collecting at the Water Gap. 171 

 Felt New West Indian Gall Midges 



(Dipt.) 17;, 



Editorials 178 



Notes and News j8o 



Entomological Literature 185 



Doings of Societies 191 



Obituary Prof. John B. Smith 192 



Notes on the Molting Process of Our Common Red 



Spider (Tetranychus telarius L.) (Acarina). 



By H. E. EWING, Corvallis, Oregon. 



(Plate X) 



As far as the writer has been able to ascertain, we have no 

 record of any one having witnessed the molting process in any 

 of the red spiders. Since the members of this family (the 

 Tetranychidae] are themselves almost or quite microscopic in 

 size, this fact is not surprising. In order to get any valuable 

 observations of the process, it is necessary to use the com- 

 pound microscope; and since the molting process occurs but 

 three times in the life of an individual, and occupies only a few 

 minutes many weary observations would ordinarily have to be 

 made in order to see it. 



OBSERVATION OF THE MOLTING PROCESS ON THE STAGE OF 



THE MICROSCOPE. 



While working out the life history of our common red spider 

 (Tetranychus telarius L.), a species which is known to every 

 keeper of a greenhouse and to almost every gardener or or- 

 chardist, I was fortunate enough to observe the complete pro- 

 cess of molting of a quiescent larva into the nymphal stage. 



