33 



large mosquito ana is very blood-thirsty. It is attracted to the house 

 in numbers. The differences between the mah's and females are well 

 brought out in the illustrations, and the striking feathery antennte and 

 palpi of the male render it very conspicuous. The wing markings and 

 the color of the palpi differentiate this species f roui our other species of 

 Anopheles, and the long palpi of the female at once distinguish it from 

 all species of Culex. 



Pig. 7. — Resting positions of Culex (at left) and Anopheles (at right) , enlarged (redrawn from a rough 

 sketch published in the British Medical Journal). 



liestirig j^osition.—O^mg to the publication of a field sketch made 

 at Sierra Leone by a member of the Ross expedition, and which is 

 here reproduced, the writer has been much interested in watching the 

 resting positions of the adult insects. He finds that when resting upon 

 a horizontal surface — such as the ceiling of a room or the covering of 

 the breeding jars — the insect clings with its four anterior legs in a 

 nearly perpendicular position, its beak thrust forward toward the sur- 

 face to which it clings. The hind legs are frequently in motion, but 

 as a rule hang downward with more or less of a bend at the knee joint 

 (femero-tibial articulation). When resting upon a perpendicular sur- 

 face, however — such as the side wall of a room or the side of a breeding 

 jar — the bod}' is held only at a comparatively slight angle from the 

 surface. Sometimes it is nearl}' parallel with the surface. At other 

 times it assumes an angle of 10° to 20° (occasionally^ even as great 

 an angle as 30° to 40°), the proboscis being held nearl}^ in a line with 

 the bod}'. Here again the insect supports itself by the four anterior 

 legs, the hind legs dangling down with more or less of a bend at the 

 8495— No. 25—05 5 



