45 



tobacco infusion plus kerosene, or carbolic acid. Fumigation 

 with sulphur or tobacco for 20-30 minutes in a tight box stall with 

 an opening for the head of the animal. 



Pediculidae of man — Three species of sucking lice infest man, 

 Pediculus hiimanus, or head louse (usually referrred to in medical 

 works as P. capitis), P. corporis, or body louse, and Phthirius inguina- 

 lis, pubic louse. 



Order DIPTERA 



True flies. Two suborders: '^'EM.K'TOCERA., mosquitoes, gnats, 

 et. al., have long antennae, consisting of at least six segments. 

 BRACHYCERA, hot-flies, house flies, sheep "ticks", et. al., have 

 short, 3-segmented antennae. 



Suborder NEMATOCERA 



Family Culicidae, mosquitoes. Small, 2-winged, wings narrow, 

 and with their veins covered with scales; antennae plumose in males, 

 simple in females. Females only, suck blood. Immature stages 

 aquatic, larvae commonly known as wrigglers; pupae active. See 

 the important general discussion of Howard, '01, Smith, '04, Mitchell, 

 '07. 



We shall consider here the general characters of the genus Culex, 

 as compared with those of Anopheles, the malaria bearing mosquito : 



Culex. Anopheles. 



Adult — Wings clear Adult — Wings spotted 



Palpi short Palpi long as beak. 



Resting position with Resting position with 



body and wings paral- body at an angle to 



lei to wall. wall. 



Eggs — Laid in raft-shaped masses Eggs — Laid singly, always 



on end. lying on their sides. 



Larvae — Hang in water at a Larvae — Lie in water with body 



great angle to the sur- parallel to surface. 



face. Pupae — Rest at a much smaller 

 Pupae — Rest almost perpendicu- angle to the surface. 



lar to the surface. Breathing siphons broad. 



Breathing siphons nar- 

 row. 



