西非的疟疾一般由催命按蚊(An.funestus)和冈比亚按蚊(A.gambiae s.I.)传播。在疟疾流行病学调查中,发现许多变异种,因而须更准确地鉴定媒介。已有许多鉴定技术,较为重要的是染色体方法。研究表明,催命按蚊很少多态,高度内栖,一般对常用的杀虫剂敏感。而冈比亚按蚊种团则不然,在西非该种团中有3个种,即阿拉伯按蚊(An.arabiensis),狭义冈比亚按蚊(An.gambiae,s.s.)和米勒按蚊(An.melas),有明显的染色体变异。冈比亚按蚊染色体条带顺序的排列是由臂内倒位决定的。这些倒位中有些为固定性的(纯合子),另一些为浮动性的变异群体,表 Malaria in West Africa is generally transmitted by An.funestus and A.gambiae s.I. In the malaria epidemiology survey, many variants were found and the medium must therefore be identified more accurately. There are many identification techniques, the more important is the chromosome method. Studies have shown that Anopheles stephensi is rarely polymorphic and highly endangered, and is generally sensitive to commonly used insecticides. In contrast, the Anopheles gambiae were not found in the Anopheles gambiae, but there were three species in the group in West Africa, namely, An.arabiensis, An.gambiae (SS) and An.melas ), There is a clear chromosomal variation. The arrangement of the An. Gambiae chromosome sequences is determined by the in-arm inversion. Some of these inversions are fixed (homozygotes), others are variable populations of variability, the table