窄板额蚤华北亚种幼虫形态研究（蚤目：细蚤科）

描述了窄板额蚤华北亚种的幼虫形态，并和同属幼虫进行比较。窄板额蚤华北亚种幼虫的形态和棕形额蚤指名亚种幼虫的形态比较相似，但肛梳刚毛数量可以区分，前者总数超过24根，后者总数不超过20根。再通过与其它5种(亚种)额蚤幼虫的形态比较，发现属于额蚤亚属5种幼虫的大颚齿数一般为5个齿，一龄幼虫的破卵器正面为鞋形；而属于鸟额蚤亚属前额蚤灰獭亚种的幼虫的大颚齿数达9个，一龄幼虫的破卵器正面为球拍形。这些差异可能是亚属间的形态差异。

The larval morphology of Frontopsylla nakagawai borealosinica (Siphonaptera:Leptopsyllidae)

The morphology of the larva of Frontopsylla nakagawai borealosinica (Fnb) Liu, Wu et Chang, 1986 was studied and compared with other five congeneric species: F. spadix spadix (Fss), F. elatoides intermedia (Fei), F. elatoides elatoides (Fee), F. aspiniformis (Fa) and F. frontalis baibacina (Ffb). The number of mandibular teeth for each species is: 5 (Fnb), 5-6 (Fss), 5 (Fei), 5 (Fee), 5 (Fa) and 9 (Ffb). The number of occipital setae: 4(6) (Fnb), 4(4) (Fss), 4(12) (Fei), 6(6) (Fee), 4(6) (Fa) and 4(10) (Ffb). The number of setae of 1-5 abdominal segments in the posterior pringcipal row: 10(2) (Fnb), 10(2) (Fss), 8(4) (Fei), 8(4) (Fee), 10(2) (Fa) and 8(4) (Ffb). The number of setae of fore/hind rows on anal comb: 4-6/20-24 (Fnb), 4/14-16 (Fss), 10-12/20-26 (Fei), 4/28-30 (Fee), 5-9/18-20 (Fa) and 2/14-17 (Ffb). The number of strut setae per side: 8-11 (Fnb), 8-11 (Fss), 18-20 (Fei), 18-20 (Fee), 15 (Fa) and 7-9 (Ffb). The shapes of egg burst by dorsal view are like the shape of shoe except that of F. frontalis baibacina , which is like the shape of table tennis bat. Based on all characters listed above, F. nakagawai borealosinica has closer relationship with F. spadix spadix with a distinguishable character, the number of setae of hind row on anal comb. It is obvious that these six species of Frontopsylla can be classified to two groups according to the number of mandibular teeth and the shape of egg burst: one group consisting of one single species, F. frontalis baibacina , and another group consisting of the rest species. This grouping is congruent with that based on adult morphology.