MB. WALKEB’S CATALOGUE OF DIPTEBOTJS INSECTS. 5 
Burman Empire with the expanded continent of Asia, and south- 
wards in close approximation with that archipelago of splendid 
islands which run in a chain to the north coast of Australia, and 
send off a branch northwards through the Philippine Islands to 
the coast of China, touching there again the mainland of Asia. 
The present catalogue will be followed very shortly by one detail- 
ing the species of Diptera discovered in Borneo, the materials for 
which are now nearly all in this country, and other catalogues will 
follow until Mr. Wallace’s discoveries in the Diptera are exhausted. 
That Mr. Wallace will be able to visit all the islands of the Indian 
Archipelago is not to be expected ; but still, his plan of exploring 
those which have been but little examined in a natural-history point 
of view, will open up a large amount of information, -which, when 
combined with the labours of other naturalists who havo been 
working in the same districts, will give sufficient facts for laying 
down some laws on the geographical distribution of the insects 
belonging to the Order which forms the subject of the following 
catalogue. The specimens collected at Singapore and Malacca 
were taken during the six months commencing with May and ter- 
minating with October. Where the altitude of the locality above 
the level of the sea of any species is known, this will be found 
noted in the proper place. Figures will be given to illustrate new 
genera or any very remarkable species. 
William Wilson Satjndebs. 
14th January, 1856. 
Fam. BIBIONIDAE, Holiday. 
Gen. Plecia, lloffmansegg. 
1. Plecia doksalis, n. s., mas et fcem. Atra, tkoraee rufo, alia nigrican- 
tibus. 
Male and female. Deep black. Thorax bright pale red. Wings blackish. 
Length of the body 2£-3£ lines ; of the wings 7-8 lines. 
The totally red thorax of this species distinguishes it from JP.fulvicollis , Wied., 
and from P. ignicollis. Walk. 
Singapore and Mount Ophir. 
Fam. CTJLICIDiE, Holiday. 
Gen. Culex, Linn. 
2. Culex splendens, Wied. Auss. Zweijl. i. 3. 3. 
Singapore. Inhabits also Java. 
3. Culex fuscanus, Wied. Aim. Zweiji. i, 6. 9. 
Malacca. Inhabits also Hindostau. 
