BIOLOGY OF PHILIPPINE CULICIDJE. 241 



i. e., on the moist zone of the cup, she curved the abdomen downward 

 and immediately deposited a cream-white egg. This operation was con- 

 tinued until four or five eggs had been laid. She then flew to the 

 opposite side of the cup, crawling around and palf)ating the moist surface 

 with the tip of the abdomen until another spot to her liking was found, 

 whereupon she deposited several more eggs. A piece of gauze was placed 

 over the cup and the mosquito continued her egg laying. The next day, 

 as she had apparently laid all her eggs, she was killed and pinned. 



The eggs hatched two days later. 



Larva: The full-grown larva is 10 to 12 millimeters long. (PI. IV, fig. 2.) 

 It is either pure white, or as is more common, of a pinkish hue, especially over 

 the dorsal areas of the abdominal segments and the thorax. Occasionally, a very 

 dark specimen will have fainter indications of the same color on the ventrum. 



The head is very broadly oval, nearly circular in outline. The frontal area 

 has four transverse simple setae, the two nearest the median line being two-thirds 

 the length of the outer ones. A bifid seta projects laterad from below each eye- 

 spot and another of the same kind, four times as long, projects caudad from the 

 posterior inner angle of the eye-spot itself. The terminal (second) segment of 

 the antennae is very minute, being less than one-fourth the diameter of the first. 



The posterior pseudopoda are the best defined, being very large and projecting 

 from the posterior lateral angle of the thorax. The mid and anterior tubercles 

 are well defined, but not prolonged into pseudopoda. 



Each tubercle bears finely pectinate setse. 



The abdominal segments bear single, simple setse on their lateral margins, and 

 on the posterior dorso-lateral area, a single bifid seta. In addition to these there 

 are on the first, second, third, fifth, sixth, and seventh very minute, lateral bifid 

 setae, hardly perceptible. Otherwise the larva is quite bare of setae. 



Th.e respiratory siphon, which is cliitinous for three-fourths its length from 

 the tip and devoid of pecten scales, is twice the length of the eighth segment, from 

 the longitudinal axis of which its axis is deflected only slightly. 



The ninth segment is very short and bears a dorsal setiferous, chitinous 

 sclerite, subtriangular in general outline, and with erenulate margins. The dorsal 

 anchor bristles are short and pectinate, about ten in number ; the ventral twice 

 as long and of similar structure, being composed of eighteen setae. 



The anal tracheal gills are verj' robust, ellipsoidal, white, mottled regularly 

 with gray annulations and are one-half longer than the respiratory siphon. 



The lateral comb is composed of eight blunt, irregularly placed scales. (PI. IV, 

 fig. 3.) 



The length of the larval stage is about five days. 



HABITS OF THE LAKV^. 



These are the most sluggish culicid larvae that I have ever seen. 

 They move slowly and with a forward, wriggling motion, remaining for 

 long periods beneath the surface, and usually feeding among the chips 

 of bamboo to be found in the cups after the tree has been cut down; or 

 in the case of fence posts, where the top has been trimmed. They fall 

 an easy prey to the larvae of Worcesteria grata Banks, which are nearly 

 always found where the Desvoidya larvge breed. 



The very large size of the anal tracheal gills ijrovides for subaquatic 

 respiration, and the insect finds its food in the bottom of its breeding 



