CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS lOI 



barbs of the feathers, usually on the down feathers. They hatch in 

 8 to lo days and become full grown in 2 to 3 weeks. 



Dampness, filth and warm weather favor their increase. 



Control. — (a) Sanitary surroundings with access to a dust bath. 

 (b) Dusting with lice powder, such as insect powder, or one pre- 

 pared as follows: 3 parts gasoline, i part crude carbolic acid (90- 

 95 per cent.), or i part cresol. Mix together and add, with stirring, 

 plaster-of-Paris to take up all the moisture (about 4 qts. to i qt. of 

 Hquid). (c) Dusting with sodium fluoride. 

 All remedies should be applied more than 

 once. 



Following are the common Mallophaga in- 

 festing domesticated birds: 



A. Feather-lice Infesting Chickens: 



1. Head nearly square, abdomen not con- 

 spicuously marked, ^^^5 inch long. — 

 Goniocotes hologaster Nitzsch (Lesser 

 Chicken Louse). 



2. Head almost circular in front, nar- 

 rowed behind, thorax small; head, 

 thorax, and legs yellowish; white 

 stripes on segment of abdomen, 3^^ 

 inch long. — Goniocotes abdominalis ^'^■ 

 Piaget (Larger Chicken Louse). 



3. Yellowish with black markings, uncommon. — Goniocotes hur- 

 netti Pack. 



4. Smooth and shining, head squarish, }{q inch long, tawny, pubes- 

 cent. — Goniodes dissimilis Nitzsch. 



5- Body elongated, smooth and shining, black margins. — Lipeurus 



variabilis Nitzsch. 

 6. Yellowish, slender louse, }io inch long, common. — Menopon 



pallidum Nitzsch (Hen or Chicken Louse). 



B. Feather-lice of Ducks and Geese: 



1. Head and thorax red with dark bands; abdomen whitish at 

 middle, brown at sides, 3^^ inch long. — Docophorus icterodes 

 Nitzsch. 



2. White, smooth, and shining, on goose. — Lipeurus tadornce 

 Denny. 



58. — Chicken louse. 

 {Menopon.) 



