150 A. INGRAM AND J. W. S. MACFIE. 



C. tritaeniorhynchus. C. invidiosus. 



Lateral abdominal hairs Paired after the first two Single after the first two 



segments. segments. 



Scales of comb . . .. Darker in colour. Lighter in colour. 



Siphon . . . . . . Ten times the length of its Eight times the length of its 



diameter at the base. diameter at the base. 



Hair-tuftsbeyondpecten Hairs longer and tufts more Hairs shorter and tufts ir- 



or less regularly placed in regularly placed in a 



a line. spiral. 



Anal papillae . .' . . Nearly equal in length. Ventral pair much shorter 



than dorsal. 



Anal segment . . . . Almost as broad as it is long. Longer than broad. 



Breeding place. — The larvae were found in large numbers in a swamp formed by 

 the heavy rains in June and were associated with A. costalis and C. fatigans, and 

 after a day or two larvae of C. tigripes var. fuscus were found preying upon them. 

 They were particularly numerous at one part of the swamp where the water had 

 submerged a narrow path through the grass. On re-examining the swamp a week 

 later none of the larvae could be found, but on this occasion natural enemies 

 (Ephemerid larvae, dragon-fly larvae, Notonecta, larvae of Hydaticus and other 

 species of water-beetles, etc.), which had not been observed on the first occasion, 

 were extremely numerous. On another occasion larvae of C. tritaeniorhynchus were 

 found together with those of C. invidiosus, C. thalassius, and A. costalis in a large 

 water-hole by the road-side. The water in this hole contained 18 parts of chlorine 

 per 100,000. 



Culex guiarti, Blanch.* (fig. 7). 



The head is as wide as the thorax and is strongly chitinised. The antenna is 

 slightly curved and stout ; on its surface a few spicules occur, most conspicuously 

 at its base. The antennal tuft, which is placed at about three-fourths of the length 

 of the antenna from its base, consists of dark and plumose hairs. The apical 

 portion of the shaft beyond the hair-tuft is considerably darker than the basal 

 three-fourths. The mid-frontal hairs are plumose and paired, the ante-antennal 

 tuft being formed of dark and plumose hairs. The brushes are strongly developed 

 and the palps are large. The eye is large and band-like, extending on to both the 

 dorsal and ventral surfaces. The " larval " eye is small and round, lying below 

 and separated from the main eye. The mental plate is small, consisting of one 

 stout median tooth with six or seven more slender teeth on each side. 



The dorsal thoracic plumes are formed of subplumose hairs, those on the anterior 

 border being very long ; the ventral thoracic plumes are formed of plumose hairs. 

 The lateral abdominal hairs are multiple on the first segment, quadruple on the 

 second and triple on the remainder. Plumose hairs form the siphonal and sub- 



* The adults associated with two other larvae have also been identified as G. guiarti 

 [ (Bull. Ent. Kes., vii. p. 7, footnote). It is not possible to decide at present whether 

 this is due to some error in association, or to the name C. guiarti including more than 

 one species of mosquito. 



