﻿EXPERIMENTS IX MALARIAL TRANSMISSION. 525 



cross-veins in one line, the posterior rather more than twice its length distant 

 from the mid, but very variable, sometimes step-like; fringed with pale spots. 

 Length. — 4 to 4.8 millimeters. 

 Habitat. — Luzon, Philippine Islands (Miss C. S. Ludlow). 



Time of capture. — April. 



Observations. — Described from a number of specimens. A very variable species, 

 somewhat like Rosii at first sight, but easily told by the spotted legs and much 

 shorter fork-cells. The base of the first submarginal is always slightly nearer 

 the apex of the wing, and the costal spots differ slightly, but are to some extent 

 variable. The cross-veins are most unstable. The palpi are very similar, but 

 the apical band in Rossii is rather longer. The chief difference is that in Rossii 

 the second white band is a third of the way down the pajpi ; in this species it 

 is less, and the black, intervening area is much smaller. 



Description of adult male (PI. V, fig. 2). — Pale-gray, the disc of the thorax 

 being lighter than other parts of the body, the abdomen and pleurae of thorax 

 darkest. Head with dark-brown, erect scales at sides and white ones in middle 

 of occiput. Eyes ruby-red, with curved bristles projecting over them anteriad 

 from their posterior margins ; frontal tuft long, cristate, prominent, antenna 

 pale golden-brown two distal segments dark-brown; the 3-jointed palpi long, 

 slender, except the two apical segments which are tumescent (PI. VII, fig. 1), 

 with rounded apices and the penultimate having an internal tuft of long, golden 

 hairs at its base ; basal f of first papal joint dark-brown, followed by narrow, 

 white band ; apical § or less, dark-brown with a long, narrow, white spot covering 

 its middle third and a transverse, triangular, white spot at its apex. The second 

 segment all white above, except a narrow, brown area at its base, the entire under 

 surface being brown also; the apical segment nearly all white, except a very 

 narrow area of brown at its base, the proboscis dark-brown, except the tip which 

 is lighter. The palpi and proboscis are of the same length. Around the lower 

 rim of the eyes is a fringe of dark-brown hairs, pointing posteriad. 



The denuded thorax shows one median and one submedian, thin, dark line on 

 anterior 3, the remaining surface being covered with a whitish pruinescence. 



The cost® of the thorax are longitudinally striped dark brown and gray, 

 there being approximately 13 or 14 stripes. The prothoracic lobes are well defined 

 and bear a tuft of dark-brown setse. The scutellum is perfectly nude, gray and 

 with a transverse, median, dark brown spot; the meanotum nude, dark gray. 

 Halters pale gray with brown knobs. 



The abdominal segments uniformly dark mottled-brown with the entire surface 

 uniformly decorated with fine, golden sets. On the eighth segment and the 

 harpes dorsally the surface is covered with white scales, in addition to the 

 abundant, golden setse. 



The wings are as in the female, except that they are paler. 



The legs are uniformly golden and brown mottled, the apices of the tibia?, 

 metatarsi and tarsi being pale, banded, especially the posterior tarsi which are 

 themselves darker than the remainder of the legs. 



The first anterior tarsal joint has a double row of short, stout, dark spines on 

 its entire lower surface, there being about 108 in alternate succession. The 

 empodium is ? the length -of the fifth tarsal joint, its median seta making its 

 total length I that of the joint. There is a small, blunt spur at its base. 



The anterior tarsal ungues (PI. VIII, fig. 1) are unequal, the larger being 

 curved and having a single tooth at the middle. 



Length of $ 5 millimeters, length of wing 3 millimeters. 



Manila, P. I. 



Time of breeding, 14 August, 1906. 



Type tS, No. 5744 in Entomological Collection, Bureau of Science, Manila, P. I. 



62668 4 



