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Malaria in the Netherlands

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Shortwings, other subjects {cont.) season of, not starting before

July, 93. 96 seasonal incidence, in human habitations, 95 in open shelters, 94 stabular deviation, 81, 101-105, 173

zoophilous, 81, 101, 105, 106 adult females sexually active, choice of food, 81, 105, 106 first appearance, 141 long flights, experiments, 107, 108 field observations, 109-111,197 oviposition, preferential, apparently absent in labora-

tory, 118 conspicuous in the field, 124,

125

adult females, sexually inactive, adipose body, 99, 100, 141 agglutinins in saliva, 74 anticoagulins in saliva, 74 autumnal fixation, 96, 97, 111,

112, 157 digestion of blood, 74 feeding in autumn, 66, 99, 100, 181

first appearance, 99, 100, 128,

141, 173, 208 gonotrophic dissociation, 99

173. i8r incapable of passing winter

without food, 100 maxillary teeth, 64 salivary glands during hi-

bernation, 127, 130 segregation, 67 semi-hibernation, animal habitations, 67 attic bedrooms, 60, 67, 99,

206, 211 begins by the end of July, 60. cupboard-beds, 157, 211 short flights, 111, 112, 158, 162,

181, 212, 250 transient fat, 100

Shortwings, other subjects (cont.) wing, 64 adult males, hypopygium, 72, 78 long flights, not inferior to those in females, 108, 110 more numerous in open shelters than in stables, 93, 94 wing, 65 eggs, columellae, 76 fresh water, comparatively rare

in, 124, 125 intercostal film of floats, 72, 75 number of ribs on floats, 72, 75 papillae, 76

pattern of upper surface, 77 salty water, greatest profusion in, 124, 125 larvae, breedingplaces, broad canals, 116 lakes, 5, 6, 115, 116 narrow ditches, 6, 115, 116 swamps, 6, 115 vegetation, 116, 117 fresh water, comparatively rare

in, 119, 123, 199 geographical distribution, 119122

pilotaxy, 72, 78, 114, 115 preferential breedinghabits, apparently absent in labora-

tory, 117, 118 conspicuous in the field, 118124

salty water, greatest profusion in, 6, 119, 123, 181 the first cause of the malariousness of the Netherlands, 70, 71, 122, 173,181, 218, 251 seasonal incidence, 95, 96 shortage of — in fresh and brackish water, with regard to number of eggs, 114,125 suggests crowding out of shortwings by longwings, 125, 126 not confirmed by laboratory observations, 126