Entomology for medical officers / by A. Alcock.

  • Alfred William Alcock
Date:
1920
Catalogue details

Licence: In copyright

Credit: Entomology for medical officers / by A. Alcock. Source: Wellcome Collection.

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    chitinised, consist of less than 3 segments, or even appear to be unsegmented. For the determination of genera and identification of species, specimens should be dehydrated in spirit, cleared in turpentine, and mounted in Canada balsam. In the case of large specimens it will be necessary first of all to soften them in caustic potash solution, and perhaps also to bleach them slightly in peroxide of hydrogen. i. 6. 7- 2. \ Family PULICIDdi. The following is a synopsis of the pertinent genera:— {Eyes well developed (comb on head and pronotum absent or present) — 2. Eyes absent or vestigial (comb, or teeth, on head and pronotum always present) = 6. ^No comb on head or pronotum = 3. A comb on pronotum only = 4. A comb on pronotum and two teeth on cheek, at the genal angle = Chiastopsylla. A comb on pronotum and on lower edge of head = Ctenocephalus. Sternum of mesothorax divided by an internal chitinous thickening which runs obliquely forward from the coxal articulation = Pulex. Sternum of mesothorax divided by two internal chitinous thicken¬ ings, one as in Pulex, the other running vertically upwards from the coxal articulation to the upper border of the meso- sternum = Xenopsylla. Pygidium not freely projecting = 5. Pygidium strongly convex and freely projecting behind = Pygiopsylla. Club of antenna incompletely segmented ; only one antepygidial bristle on each side = Hoplopsyllus. Club of antenna completely segmented ; more than one ante¬ pygidial bristle on each side = Ceratophyllus. c None of the abdominal terga with combs = 7. 3 One or more of the abdominal terga with a comb l = Hyslricopsylla. f Bristles of hind border of tibiae not in a close-set row = 8. I Bristles of hind border of tibiae in a close-set row = Ctenopsylla. Last tarsal segment of first and second legs with five lateral bristles on either side, of third legs with four = Neopsylla. 1 Last tarsal segment of first and second legs with four lateral l bristles, of third legs with three = Ctenophthalmus.
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