502 Annals of the South African Museum. 



GEN. CLOEON, Leach. 

 CLOEON AFRICANUM, Esb. -Peters. 



Esben-Petersen, Auu. South Afr. Mus., vol. x, p. 184, 1913. 



One male, Kimberley, 1912 (Power leg.), and one female, Ceres, 

 April, 1913 (Lightfoot leg.). 



I refer the female to this species. It is smaller than the male ; the 

 thorax is brown with a paler longitudinal median streak. The dark 

 annulations at the seta! joints ai*e broader than in the male. 



MEGALOPTERA. 



SIULIDAE. 

 LEPTOSIALIS, n. gen. 



No ocelli (three very small tubercles are visible in front of the head). 

 Antennae rather pilose. Labrum four times broader than long, with 

 rounded lateral margins and with slightly emarginated front margin. 

 Prothorax twice as broad as long. Wings long and rather narrow. 

 The neuration is not so distinct as in Stalls. The costal area of fore- 

 wing is slightly broadened and only in the basal third part. The 

 cross-veins in the costal area at - e obliquely directed towards the sub- 

 costa. The subcostal area without cross-veins. The radial area 

 with four cross-veins in the forewing, three in the hiudwing. The 

 first branch from Es not foi'ked. In the fore wing M fuses with Cu 1 

 for a short distance, and it forks one third out from base of wing ; 

 in the hiudwing it forks two thirds out from base. Gti and 2 A 

 fork in both pair of wings near base. Fourth tarsal joint bilobed. 



Genotype: Leptosialis africana, n. sp. (Fig. 5.) 



This interesting genus, only known from South Africa, is nearer allied 

 to the American genus ProtosiaUs than to the palaearctic-nearctic genus 

 Sialis, but its broad labrum and its elongated wings offer good and 

 distinct generic characters. It is the first genus of the Siallnae found 

 in Africa. 



LEPTOSIALIS AFRICANA, n. sp. 



Head, thorax and abdomen black. Lateral margins of labrum 

 greyish yellow. Head with small tubercles and several longitudinal 

 striae, but without smooth spots or markings as in the species of 

 Sialis. Legs yellowish brown ; hind femora a little darker in their 

 middle. Third, fourth and fifth tarsal joint almost dark brown. 

 Membrane of wings sooty brown ; the proximal half part darker than 



