NO. I 



BLACK FLIES OF GUATEMALA — DALMAT 



401 



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I £ 8 4 S e 7 a » 10 II 12 19 14 19 18 17 la l» 28 SO 81 



DURATION OF BLOOD MEAL (minutes) 



Fig. 14. — Feeding time (in minutes) of the three principal anthropophilic 

 species of Simuhidae. (Prepared on 3-cycle semilogarithmic paper.) Observa- 

 tions were made on the feeding time of 1,012 S. ochraceum, 803 metallicuni, and 

 232 callidum. 



