187 



ON THE YOUNG LARVAE OF LYCTUS 

 BRUNNEUS STEPH. 



By a. M. ALTSON, F.E.S. 



(With 2 Text-figures.) 



CONTENTS. 



PAGE 



Introduction . .187 



Description of First Instar Larva . . . . .187 

 Description of Second Instar Larva . . . .191 

 Observations on the Larvae ...... 191 



First Instar 191 



Second Instar ........ 193 



Conclusions . . . 194 



Summary .... .... 195 



Acknowledgments 195 



References 195 



Introduction. 



This paper describes the first and second instar larvae of L. brunneus, 

 with some observations on their habits, and it includes a few notes on 

 certain parts of the anatomy of the larvae of later instars. 



These observations and notes were made, partly in 1920 and in the 

 following year, during an investigation into the ra^^ages of the beetle, 

 and constitute part of the results, of which some have been pubhshed 

 elsewhere. 



No account of the early larval stages of any beetle of the genus 

 Lyctus, or of the family Lyctidae, appears to have been published. 



In another paper^ a description is given of the position of the young 

 larva at the time of maturation, and the observations here are continued 

 from that point. 



Description of First Instar Larva 2. 



The first instar larva (Text-fig. 1, i) is creamy white and is very small, 

 averaging 0*65 mm. long by 0-23 mm. wide at the thorax. It is sub- 



^ "The method of oviposition and the egg of Lyctus brunneus Steph." {In the press.) 

 2 Nomenclature after Hopkins (1909, Tech. Ser. No. 17). 



