THE MOSQUITOES OF EGYPT, THE SUDAN AND ABYSSINIA 77 The specimens show great variation in size. The large ones look very like Mansonia major, Theobald (Mono. Culicid. Ill, p. 270) but the forked cephalic scales have mostly only one median spine, but may have two as in M. major, but the lateral spines are equal not unequal. This character I neglected to point out before. For figures of wing, vide Plate II., Fig. 3, and Plate IV., Fig. 1.

Dr. Balfour writes that this species “becomes common and remains so shortly after passing Wad Medani on the way South.”

It is widely distributed over Central, Northern, East and Western Africa, and also in India and the Philippine Islands. I have had none from the Transvaal, Orange River Colony or Cape Colony.

Mansonia major, Theobald Mono. Culicid. Ill, p. 270 (1903) No fresh specimens have been received since the one sent me by Capt. Cummins taken in the Bahr-El-Ghazal.

It is larger than the largest of the preceding species reaching 6.5mm. in length. It can be told by the upright forked cephalic scales having the thin lateral spines unequal and by their irregular form and the “ border scales ” on the wing being all dull yellow whilst in M. uniformis they are in alternating patches of dull yellow and black.

Genus Teniorhynchus, Arribalzaga Dipt. Argentina, p. 47 (1899 ); Mono. Culicid. II, p. 190 (1901) Tczniorhynchus aurites, Theobald Mono. Culicid. II, p. 209 (1901) and III, p. 269, (1903). This species occurs in fair numbers on both the Blue and White Niles. Dr. Balfour took them between Roseires and Sennar on the Blue Nile, at Bahr-El-Jebel North Sudd country on the White Nile It also occurs in Uganda and on the West Coast at Bonny and in the Federated Malay States.

Treniorhynch us annettii, Theobald Mono. Culicid. II, p. 205 (1901) A single female with body gorged with blood and denuded of scales thu> appearing black. The sixth dusky scaled long vein is prominent and cleaily defines it from the former species.

Taken at Lake No, White Nile. Dr. Balfour adds a note “ femora spotted black,” I cannot detect the spotting in the specimen he sends. This beautiful species has also been taken in Old Calabar.

Fig. 3 Upright forked scales of a Mansonia major b Matisonia uniformis