201 



The eggs are laid close to the base of the hairs on the lower extremities 

 of the limbs. The appearance and measurements of the eggs 

 and nymphal forms are described. As the eggs are always located 

 about the feet of the animals, they can easily be dealt with ; in summer 

 the ordinary baths given for mange are efficacious, and in winter 

 the animals should be walked through a parasiticide solution, wetting 

 only the feet. 



Smyth (E. G.). Dominio de la Plaga de la Mosca del Ganado en 

 Puerto Rico. [Control of the Horn-fly Pest of Cattle in Porto 

 Rico.] — Rev. Agric, Puerto Rico, San Jucm, iii, nos. 5 & 6, October 

 and November 1919, pp. 10-24, 17-28, 4 plates. 



Considerable loss occurs to owners of cattle in Porto Rico from 

 Lyperosia irritans, L. (horn-fly), which was introduced about 15 years 

 ago. This arises from a reduction in the yield of milk and in working 

 power owing to molestation by this fly interfering with proper grazing. 

 It is especially abundant during or following the rainy season, but the 

 damage it does is most noticeable in the dry, south coast districts, 

 where the grass is of poor quality and the fly numerous. The adult 

 fly spends almost all its hfe on the cattle, only leaving them for brief 

 periods to deposit its eggs on the manure. Under favourable circum- 

 stances the life-cycle may occupy only two weeks. 



The information that has been gained in various countries on the 

 transmission of disease by L. irritans [R.A.E., B, vi, 181, etc.] is 

 reviewed. A number of formulae for repellents and sprays that 

 have been tried in difl'erent places is given with notes on the natural 

 enemies of this fly in various countries. 



In Porto Rico some of the birds useful in this connection are a 

 humming bird {Anthracothorax aurulentus), the Jamaican cliff swallow 

 {Petrochelidon fulva poeciloma) and several flycatchers and warblers. 

 Large numbers of fly larvae have been found in the stomach of a 

 sandpiper {Pisobia minutilla), and the Porto Rican blackbird {Holo- 

 quiscalus brachypterus) is especially useful in scattering the cattle dung 

 and incidentally eating or otherwise destroying the larvae and pupae. 



The attempted introduction of parasites of this fly is recommended 

 on the Hnes that have been successful in Hawaii [R.A.E., B, v, 137, 

 etc.]. 



Fillers (A. W. N.). Some accidental Parasites of the Ear of the 

 Domesticated Rabbit and Guinea-Pig. — Vet. Jl., Lotidon, Ixxvi, 

 no. 9, September 1920, pp. 331-334, 5 figs. 

 The mites found infesting ears of rabbits and guinea-pigs include 



Glycyphagus domesticus, deG., TyroglypJms {Aleurobius) farmae, Gerv., 



and C hey Ictus eruditus. 



Splendore (A.). Sui Parassiti delle Arvicole. [The Parasites of ^the 

 Field Rat, Pitymys savH.] — Ann. d'Igicne, Rome, xxx, no. 8, 

 August 1920, pp. 445-468, 6 plates. 

 The insect parasites of the important agricultural pest, Pitymys 

 sam, are the fleas, Ceratophyllus fasciatus, Bosc, Typhlopsylla assimilis 

 (?), Taschb., and Hystrichopsylla tripectinata, Tirab., a louse, Hoplo- 

 pleura acanthopus, Burm., and the mites, Myobias]). (?) and Leiogna'.hus 

 albaius, Berl. 

 (719) B 



