236 BANKS. 



a single joint of a bamboo fence, so that it is probable that in nature 

 the female lays more eggs than when in captivity. 



Larva: The larva upon hatching measures 2 millimeters in length, and is 

 nearly pure white; when full grown its length is 14 millimeters. The general 

 form and appearance of the larva upon hatching is the same as it is when full 

 grown, except in color. The distinctive appearance of the head and the lateral 

 bristles and spines remains the same throughout the larval existence. 



Full-groivn larva: The full-grown larva of Worcesteria grata Banks measures 

 14 millimeters in length, exclusive of caudal bristles, and 2.5 millimeters in width, 

 exclusive of lateral bristles. The color is carmine on the dorsal surface and pink 

 or whitish-pink ventrally. The head is dark brown, the eyes being nearly black. 

 (PI. I, fig. 2.) 



The surface of the body is covered at certain points by dark brown, chitinous 

 plates or selerites, from which the bristles and setiE grow. These sclerites are 

 regularly and definitely arranged as shown by the figure. 



The head, which is slightly more than half the length of the thorax and a 

 little more than half its width, is subquadrate in general outline, the anterior 

 portion being somewhat more acute than the posterior, the outer angles of which 

 are rounded. 



The eyes are situated about half way from the front under a lateral, longi- 

 tudinal carina. The antennse are less than half the length of the head, have 

 three sub-apical bristles on the inner margin and a single apical one. A bristle 

 projects on each side of the face near the median line. Three project laterally 

 beneath each eye. 



The arrangement of the thoracic bristles is somewhat the same as in Myzomyia 

 ludlowii Theob. There are two distinct tyjjes of bristles upon the thorax. Those 

 growing from the chitinous sclerites are setose or plumose, while those from the 

 other portions are simple, as shown in the figure. 



The setiB or hairs found upon the body segments are so arranged and of such 

 length proportionately that when spread out laterally, which is their normal 

 position, they make the gross outline of the larva an acute oval or lens shape. 



The ninth segment and breathing siphon are of a structure meriting special 

 note. The entire segment is covered with a brown, chitinous sclerite, the posterior, 

 lateral and ventral edges of which are minutely serrate or dentate. A single 

 plumose seta projects from the posterior lateral margin, and below this seta and 

 projecting posteriad to it is a series of long, fine, simple hairs. 



From the posterior portion of the dorsal margin of the segment projects a 

 small, fleshy tubercle from which there grows a cluster of long, simple hairs, ten 

 in number. This tubercle serves as an anchor when the larva rests against the 

 side of the vessel in which it breeds. 



The anal papillie, which I shall term anal tracheal gills and which, un- 

 doubtedly, serve as a secondary respiratory apparatus, are very sliort and evenly 

 rounded, scarcely projecting beyond the posterior margin of the ninth segment. 



The respiratory siphon is short and stout, the length being only slightly more 

 than twice the width of the base. The entire surface of the siphon, with the ex- 

 ception of the articulation at the base, is covered by a single chitinous sclerite. 

 From a small, soft tubercle at the posterior edge of the base, fine, short, stout 

 pectinate bristles project. These bristles are not as long as the diameter of the 

 base. 



Ventrad to the base of the siphon, on each side of the eighth segment, is a 

 single, subtriangular, chitinous sclerite, from the posterior edge of which project 

 caudad two pectinate bristles, one from the middle and one from the ventral angle. 

 (PI. I, fig. 3.) 



