Abstract: The present paper describes the larval morphology of Ceratophyllus wui Wang et Liu, 1996. Specimens were collected from a swiftlet Collocalia brevirostris innominata nest in the Shennongjia forest region (31°15'N, 109°56'E, about 2 300 m elevation) in the northwest of Hubei Province on Aug. 27, 1998. Diagnosis of larvae: C. wui Wang et Liu, 1996 is similar to C. eneifdei tianschani Kunitskaya, 1968, C. chutsaensis Liu et Wu, 1962 and C. gallinae tribulis Jordan, 1926, but differs from the latter three species in: 1) the spine process on the egg burster of 1st instar larva does not extend beyond the anterior margin of the egg burster; 2) there are two pairs of preantennal setae in 3rd instar larva; 3) the outside setae of the occipital region are longer than the middle setae. Description: In 3rd instar larvae,maxillary palp in 2 segments. Antenna stick shaped, with 1 short apical seta. Intraantennal setae thin and short. Front with 2 long, 2 short and 2 minute setae. Occipital setae in one row of 6 long setae, with one pair of minute setae efore and after the sub-middle occipital setae. One minute seta before the outermost occipital setae and at the occipital margin. There are 7-8 teeth on the mandibules of which the basal part is small and sharp and the tooth tip large and thumbshaped. Main setae numbers of the first thoracic segment to ninth abdominal segment: 7-8(2),8(2), 7-8(2),10(2),8-10(2),9-10(2),10(2),8-10(2),9-10(2),9-10(2),10,12; assistant setae numbers of anterior row: 10,10,10,11-12,11-12,12,10-12,12,10-12,11-12,12,9-10 respectively. Anal comb 2 rows, anterior row with 6-9 and posterior row 13-18 setae.Egg burster of 1st instar larvae similar to a shoe sole in shape, anterior part slightly wider than posterior part, spine process not extending beyond anterior margin of egg burster.

Key words: Siphonaptera, Ceratophyllidae, Ceratophyllus wui, larvae