Abstract: In this paper a new species of the genus Cephalcia is described. Cephalcia pinivora is a serious pest of Pinus massoniana Lamb. in Yongchuan and Dazu Counties, Chongqing Municipality. Cephalcia pinivora Xiao et Zeng new species Female——Yellowish brown,shining. Head and palpi yellowish brown; antennae deep yellow with apical five segments black;ocellar triangle and eyes black. Thorax yellowish brown; prescutum,most of mesoscutum,mesoscutellum, posttergite,basal part of mesoepisternum adjacent to mesobasisternum,mesoepimeron,mesobasisternum black;metascutellum,postnotum black. Wings hyaline;stigma black;veins deep yellow; below base of stigma a nearly oblong grey black patch present. Legs yellowish brown,ventral part of trochanters partly black. Abdomen yellowish brown;triangular area black. Clypeus swollen in middle,concave in lateral parts;frons swollen,not tuberculate;median fovea oval; lateral sutures and transverse suture distinct,coronal surture obsolete;OOL:POL:OCL=1.7:1:1.7;length of postocellar area :its width=1.1:1;postgenal carina absent. Punctures on postocellar area and postocular area denser,moderate sized,distance between punctures about equal to diameter of a puncture;paraantennal fields with coarse punctures;punctures on back of mesonotum sparser and those on mesoepisternum finer and denser;terga without punctures. Head and prothorax with yellowish moderate long pubescence. Body length 14 mm;antenna 29 segments. Male——Black,shining. Head and thorax black; mesobasisternum yellow. Stigma blackish brown;veins black except for costa which is yellowish black. Abdominal terga black with lateral parts yellow;posterior margins of sterna yellow. Clypeus slightly swollen in middle;frons swollen,tuberculate;median fovea indistinct;OOL:POL:OCL=2.5:1: 3.3. Body length 13 mm;antenna 29 segments. Harpes and parapenis as in fig.1 1; penis valve as in fig.1 2;ninth sternum as in fig 1 3. Other characters the same as for female. Hollotype,♀,Dazu County ,Chongqing Municipality,1997.Ⅴ.10,Xingwei Yang leg.Paratypes:4♀♀,5,same as for hollotype;Yongchuan County,Chongqing Municipality,1996.Ⅴ.17,4♀♀,6 ,Song Chen leg. Host plant: Pinus massoniana Lamb. Remarks:The new species resembles Cephalcia kunyushanica Xiao,but differs from the latter in female with ocellar triangle black,below base of stigma a nearly oblong grey black patch present,about apical half of fore and hind wings not infuscated. All the type specimens are deposited in the Insect Collection of the Institute of Forest Protection,the Chinese Academy of Forestry.