80 



REPORT ON ECONOMIC ENTOMOLOGY 



Mansonia (?) 

 nigra 



scales and some black bristles; palpi iluskv brown, almost Mack almiy the two apical 

 segments and on the apex of the antepenultimate, traces of a pale band (very narrow) 

 towards the base ; hair-tufts deep brown ; proboscis deep brown, thin. 



Thorax mudi as in the female, l(Ut the scanty ornamentation not so distinct ; plcunr 

 pale with imlistinct patches of grey scales. 



Abdomen deep brown, hairy, the segments witli tiasal white lateral spots, the last 

 segmi'Ut with a basal whit*' band, posterior border-bristles pale golden, short ; lateral hairs 

 very long, golden brown ; basal segment testaceous, with two ])roniinent tufts of black scales. 

 Owing to scanty sealing the abdomi-n appears to be basally pale banded. 



Legs deep blackish-lirown, unbanded ; the coxjo an<l base and venter of femora creamy 



white ; a faint, pale, knee spot and a small spot at 

 the apex of the tibiie. Ungues of the fore legs and 

 mill legs unequal, both uniserrated ; the larger fore 

 unguis more curved tluiii tlic mid; liiinl ones ciiual 

 and simple. 



Genitalia (Fig. 39), with broad flat claspers, ending 

 abruptly in a narrow portion; the foliate plate very 

 bruad and witli longitudinal striae ; three long flattened 

 processes at the side, between the clasper and the 

 foliate plate; the middle spines are the largest, the 

 third of these are the shortest; there is also a single 

 spine bent like a fish hook. 



Tile two apical segments of tlie i>alpi of nearly 

 (M|iial length. 



The vein scales on the apices of the veins rather 

 broader than usual. First subniarginal cell longer 

 and narrower tlian the second posterior cell, their bases 

 about level ; stem of the first subniarginal rather less 

 than half the length of the cell ; stem of the second 

 posterior not quite as long as the cell ; posterior cross-vein nearly twice its own length 

 distant from tlic mid cross-vein. 

 I.i'uijtli. 4 mm. 

 Habitat. Upper White Nile. 



Observation. Described from three nudes. Two have been dissected. Tlic male 

 genitalia are very marked, otherwise the male might be mistaken for Culex riridis, Theobald. 

 The iiale i)leura' difl'crs from the female tyjie in which the pleunc are dark, but the 

 latter effect is undoubtedly due to the body being filled with blood. 



The pale scaled head and scutellum should easily separate it without microscopic 

 examination. 



Genus Mansoni.\, Blancliard 



Comp. licnd., Ilebd. Soc. d. Biol., 37, T. liii., p. lUlO (UJOl) 



Mono. Culicid. II., p. 173 (1901) 



Mansonia (?) nigra, nov. sp. 



Thorax very dark brown, with dark brown and golden scales forming an irregular 



ornamentation. Proboscis black, with a narrow white band towards its ba.se. Abdomen 



black, with narrow, somewhat irregular, white bands and a few scattered white scales 



KiG. 89.— Ci:lkx pallidocrpiiai.a, Theob. S 

 Left side of genitalia 



