WERNER MARCHAND 159 



two elements working in apposition. At rest they are held horizontally, and can 

 be projected suddenly and thrust vertically downward, which is obviously of 

 great assistance in grasping the prey." 



"The palpi and antennae in this species are silvery white, and usually found 

 glistening with moisture." 



"The eyes are oval in shape, with the long axes parallel. When the larva is 

 prepared to molt, the pigmented spots are usually distorted. In this species 

 the eye spots or ocelli are very prominent, especially in the younger stages of 

 the larva. They can be first seen in the embryo where they appear as dark 

 beaded structures through the chorion of the well developed egg. In the young 

 stage of the larva the eyes appear in the pharyngeal cavity midway between the 

 mouth and the cephalopharynx, and as growth continues they are located nearer 

 the distal end of the head capsule; so that when the larva is full grown and the 

 mouth structures protrude in locomotion or prehension the eye spots are seen 

 to project on the head capsule with the mouth parts." 



"The trachea which terminates in the conical tubular syphon is lead gray in 

 contrast to the dense white of that portion anterior to the anal segment. Anterior 

 to the syphon there is a cuticular cellar of slightly darker shade." 



"The prolegs are formed by truncated projections, six in number, three on 

 each side of the midventral line and extending laterally. Each protuberance is 

 provided with a tuft of short, fine, brown hairs. These hairs appear to be sur- 

 rounded by a secretory substance, which is slimy in character." 



"At the base of the syphon, beneath the cuticle on the dorsal side opposite 

 the anal capsule, is a tiny structure which attracts attention on account of its 

 movements and peculiar arrangement. In the newly hatched larva it is a process 

 composed of four lustrous black disks arranged in two pairs, one in front of the 

 other, and set in a mass of fat bodies. The larger of the disks, the anterior 

 pair, is less than 0.1 mm. in diameter. The movement of the process is similar 

 to that of a pendulum, and is active only when the larva moves. With each 

 molt these disks become smaller and increase in number. In the full grown 

 larva the process becomes a triangular mass of loosely arranged beaded disks. 

 They appear to be mere specks of pigment beneath the skin, but their structure 

 and action are so constant that either the process is characteristic of the species 

 or investigators have overlooked or ignored them in other species." 



The description of the pupa (Plate 12, Fig. 152, a, b; Fig. 143, a, 

 h) after Mitzmain is given below: 



"The average length is 18 mm., and width, 3.5 mm. The color is pale brown, 

 the last 2 segments of the abdomen being slightly darker. The head tubercles 

 are not clearly defined; color, dark brown. The prothoracic spiracular tubercle is 

 slightly elevated, oblique; rima, salmon-colored and crescentic in form." 



"The first abdominal spiracle is perfectly round and larger than the others, 

 which are slightly ovoid; the rima of all the spiracles curves from above 

 posteriorly." 



