Research on the mosquitoes of Angola - Systematic Catalog of ...

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RIBEIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> on the mosquitoes o[ Angola X 7.5.10--Culex (Culex) grahami Theobald, 1910 The only published Angolan record of C. grahami is that by Grin- dara (10) (11), from Lobito. MATERIAL EXAMINED. CANGANDALA, 2 larvae, 15.11.1970; CANGAN- DALA, 24 km SE (road to Bembo), 2 larvae, 10.I1.1970; MALANJE, 7 larvae, 1 .II. 1970. TAXON'OMIC N.OTES. Our larvae of C. grahami exhibit some non- negligible variation. The number of subventral tufts of siphon (always with 2-4 branches) varies from 8 to 14 (both sides together), some of the specimens approaching in this respect, var. farakoensis of Hamon (53). The length of these tufts is also noticeably variable, as they may reach in some specimens to about 2//3 diameter of siphon. Tlne most proximal of the subventral tufts are often inserted before the last 1-3 pec[en teeth, as figured by Hopkins (op. cit., Fig. 207) but not mentioned in the text. Also tb, e number of comb spines may be as high as 36, though it is usually about 20. Finally, it is to be noted that the last abdominal segments, including the distal of saddle, of the Angolan larvae are obviously spiculate. DISTRIBUTION. Map 17 shows the known distribution of C. grahami in Angola. BIOEOOLOGICAL N.OTES. C. grahami seems to be a ground water breeder. 2 of the larval biotopes recorded by the writers were grassy rain-water ground pools and the other one consisted of a pond with abundant aquatic vegetation, including water-lilies. In one of the ground pools, near a village, the water was dark and turbid, with high organic content, but it was clean in the other instances. Larvae of ,4n. coustani, An. squamosus and C. weschei were found as associates in two of the biotopes, while Aedomyia africana was only recorded from the pond. According to our data, C. grahami seems to be a relatively uncom- mon zoophilic mosquito in Angola. In Kenya, Someren et al. (49) reported grahami as biting man very rarely, in bush. Estud., Ens. e Dot'.- 134 81
RIBgIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> otz the mosquitoes of Angola -- X 7.5.11 -- Culex (CuIex) guiarti Blanchard, 1905 C. guiarti was firstly recorded from Biff and Bailundo by Well- man (4), in 1905, and, much later, by Worth & Paterson (12), from Caxito, in 1961. MATle,,RIAL EXAMINED. AMBRIZETE, I larva, 4.VIII. 1790; CABINDA, 2 2, 12 larvae, 18.VIII.1970; CEILUNGA, 1 larva, 11.IX.1969; UIGE, 2 larvae, 25.IX.1969, all new locality records. TAXONOMIC NOES. The green colour of thorax is obvious in one of our females, though in the other one the thorax is brownish. Both females were reared from larva. Larvae agree quite well with Hopkins' description. We must note, however, that in two of them there are only 5 comb spines on each side and that either the subventral tufts of siphon, the upper caudal seta, or the lateral saddle hair may have 4 branches. DISTRIBUTION. C. guiarti is widely distributed in Tropical Africa, including Madagascar. In Angola (Map 17), all the known locality records for guiarti are in the northern half of the country. BIOEOOLOGICAL NOTES. C. guiarti breeds in ground water. Four larval biotopes were recorded by the writers: 2 small ponds with abundant aquatic vegetation, including filamentous green algae, 1 large borrow-pit with greenish water (microscopic green algae) and 1 small ground pool with brackish water. In this last breeding place larvae of Ae. irritans, C. thaIassius and U. biIineata were found in association with guiarti. In the other biotopes the associated larvae were those of An. constahl, C. annuIioris, C. univittatus, F. (114.)mimomyiaformis and F. (M.) uniformis. Fig. 11 shows a guiarti breeding site. C. guiarti is thought to be a relatively rare zoophilic mosquito in Angola, though it may bite man rarely (49) (54). 7.5.12--CuIex (Culex) ingrami Edwards, 1916 The only known Angolan record of C. ingrami is that by Worth & Paterson (12), from Caxito, based on four adults (almost certainly 82 Estud., Ens. e Doc.- 134
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REFERENCES 1--ROQUE, A. B.--
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