참나무시들음병 매개충인 광릉긴나무좀 미성숙충태인 알, 유충, 번데기의 외부 형태와 유충 두폭을 활용한 령기구분, 지역 개체군 간 균낭수 변이를 조사하였다. 광릉긴나무좀의 알은 광택을 띠는 타원형이며 크기는 장경 $0.67{pm}0.051$ mm, 단경 $0.41{pm}0.053$ mm 이었다. 유충은 5령기를 거치며, 각 령기는 두폭의 크기 차이로 명확하게 구분되었다. 1령유충의 두폭은 $0.35{pm}0.004$ mm, 2령유충은 $0.45{pm}0.010$ mm, 3령유충은 $0.67{pm}0.039$ mm, 4령유충은 $0.94{pm}0.069$ mm, 5령유충은 $1.12{pm}0.007$ mm 였다. 5령유충 체색은 유백색의 광택을 띠며, 큰턱이 잘 발달되었다. 번데기는 연한 황색이며, 체장은 $4.64{pm}0.042$ mm 이었다. 개체당 균낭수는 변이가 있어 적은 개체는 5개, 많은 개체는 12개까지 관찰되었으며 83%의 개체들이 6-8개의 균낭을 가지고 있었다. 남양주지역과 홍천지역의 개체군간 개체당 균낭수 차이는 없었다.
This study was conducted to describe the external morphology of Platypus-koryoensis Murayama in immature stage, to determine each instar based on larvae head-capsule, and to measure individual and local variations in the number of mycangia of adult. Egg of P. koryoensis, had oval shape and lengths of the major and minor axis were $0.67{pm}0.051$ mm and $0.41{pm}0.053$ mm, respectively. Body colour of $5^{th}$ instar was gloss white with well-developed mandible. Larvae of P. koryoensis grew up to $5^{th}$ instar and each instar was clearly classified by head capsule width. Head capsule width for $1^{st}$, $2^{nd}$, $3^{rd}$, $4^{th}$, and $5^{th}$ instar larvae were $0.35{pm}0.004$ mm, $0.45{pm}0.010$ mm, $0.67{pm}0.039$ mm, $0.94{pm}0.069$ mm and, $1.12{pm}0.007$ mm, respectively. The colour of pupa was pale yellow and its length was $4.64{pm}0.044$ mm. The number of mycangia per female had individual variations from 5 to 12 and 83% of the adults had from 6 to 8 mycangia. There was no significant difference in number of mycangia collected from between Namyangju region and Honchen region.
