Species identification within Anopheles gambiae s.l. for the four sentinel sites in 2008–2010. Data are presented as proportions of the total for each species, An. arabiensis (A), An. gambiae M form (M), An. gambiae S form (S) and the hybrid of M and S forms (H), by year and by site. Sample sizes are minimum of 75 per site for 2008 and 2009 and a minimum of 309 for 2010.