444 



NELSON C. DAVIS AND RAYMOND C. SHANNON 



mosquitoes were secured in April, a few in May and June, 1926; 

 all of the examinations were done in the latter month. 



About three-fourths of the series carne from the edge of the city 

 of Tucumán; the rest were captured in Concepción, a town further 

 south in the same province. In the city, mosquitoes were taken 

 within 500 meters of their breeding place in the bed of the Rio 

 Salí, and in Concepción nearly all were caught within 300 meters 

 of the Rio Gastona flats. Excepting those captured in the 

 hospital at Concepción, practically all mosquitoes carne from 

 houses of workmen of the poorer class. Closed-in barns were 



TABLE I 



Reactions to antisera of blood ingested by A. pseudopunciipennis 



Negative 



Man 



Horse 



Cow 



Dog 



Hog 



Chicken 



Cat 



Sheep or goat 



Simultaneous reaction for 

 two bloods 



REDISTRIBUTION 



OP COMBINED 



REACTIONS 



(^ CREDIT 



allowed each 



blood reprb- 



sented in a 



couplet) 



2.3 

 0.1 

 0.5 

 1.7 

 0.4 

 0.5 

 0.1 

 1.2 



(6.9) 



MODIFIED 



TOTAL 



PERCENT- 



AGES 



50.0 

 8.9 

 5.5 



21.8 

 2.5 

 3.2 

 1.8 

 6.2 



not encountered during the searches; open sheds yielded very 

 few anophelines. 



One A. pseudopunctipennis, positive for human blood, included 

 in the series, came from a horse-shed. One A. tarsimaculatus 

 var. was found in a house, but proved negative. A. pseudo- 

 punctipennis captured in houses constituted the remainder of the 

 series, 650 specimens. 



At night many horses and mules were turned loóse in the 

 neighborhood of the houses near the Rio Salí, Tucumán; cows 

 were seen there in fewer numbers. Extensive pastures, used by 



