ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 197 



Incubation of E^gs of Horse-lice. — A. Bacot and L. Lixzell 

 {Parasitology, 11)19, 11, 388-92). Three kinds of lice are found on 

 iorses — Trickodectes equi ^nii T.p'dosus (Mallopliaga), and Bsematojmius 

 asini (one of the Siphunculata). The eggs of the last-named species 

 may take a month or more to hatch, therefore the last dressing should 

 be given not less than thirty-four days after the time the treatment 

 started. The minimum time for development from hatching to the 

 fertile female is probably about a fortnight. If the dressing is repeated 

 at ten-day intervals there should be at least four dressings. The normal 

 incubation period would appear to be sixteen to twenty days ; the 

 minimum in natural conditions about fifteen to sixteen days. A very 

 small amount of dry heat is fatal to the eggs. Moist cold also kills, but 

 dry cold lengthens out the incubation period. J. A. T. 



Systematic Questions concerning Lice. — George H. F. Nuttall 

 {Parasitology, 1919, 11, 329-16). The name Anoplura Leach (1817) 

 was originally applied to both Siphunculata and Mallophaga, and it 

 should be still used in that sense. Diagnoses are given of the order 

 Anoplura, the sub-orders Mallophaga and Siphunculata, the four families 

 of Siphunculata (Pediculidae, H^matopinidEe, Echinophthiriidfe, and 

 H£ematomyzida3), and the genera Pedicidus and Phtkirus. Morpho- 

 logical and biological evidence is submitted showing that Pedicidus 

 w pit is and P, corporis merely represent two unstable races of one species, 

 P. humanus Linnaeus. J. A. T. 



Mallophaga from Formosan Birds. — Seinosuke Uchida (Annot. 

 Zool. Japon., 1920, 9, 635-52, 3 figs.). Twenty-six species are de- 

 scribed, three new, including Coinatomenopon elongatwn g. et sp. n. 

 from a tern. It is an elongate translucent form, showing in both sexes 



Gastric teeth of Comatomenopon elongatum g. et sp. n. x 230. 



a dense row of dark-coloured teeth at the distal end of the crop. This 

 is the second case known of the presence of gastric teeth in the Mallo- 

 phaga, the first case having been reported by B. F. Cummings in 

 Trimenopon echinodermata from Cavia aperea. J. A. T. 



New Mallophaga from South African Birds.— Gr. A. H. Bedford 

 {Parasitology, 1920, 12, 167-72, 2 pis.). A description of Machwrileemus 

 2)locei sp. n. from a waxbill, and Neomenopon pteroclurus g. et sp. n. from a 

 sand-grouse. The head of the new genus has distinct and fairly deep 



