132 Journal New York Entomological Society. [Voi.xiv. 



the sun makes it conspicuous on the tips of the minute-leaved Palo 

 Verde, a small tree with few branches. Therefore it is impossible that 

 on previous collecting, it could have escaped detection if present. I 

 found the larva on September 28 and 29, 1904. From the size I 

 judged it to be in latter part of third stage. 



Larva covered by prominent spinulated tubercles, on a ground color of apple 

 green. Face green, a white line on each side of triangular space, edged by a nar- 

 row black line. Mouthparts blackish. On joint 2, a circle of silvered granulation 

 between spiracles. Thoracic tubercles spinulated, 6 mm. long. On joints 3 and 4, 

 there are four spinulated tubercles, of which there are two on each side, one above 

 the other. The subdorsal tubercle is of a purple or violet color, the lateral apple- 

 green. Spinules of subdorsal tubercle black, those of lateral are green. From 

 joints 5 and inclusive to 12 there are on each side two silvered tubercles, wedge- 

 shaped, one above the other, the inferior resting on the infraspiracular line. All the 

 lateral tubercles on inner side bright red. A circle of silvered granulations just 

 back of tubercles of each joint. On joint 13, a spinulated tubercle, 4 mm. long, 

 green on tip, reddish brown at base; spinules tipped with green and whitish at I ase. 

 Three small, silvered tubercles on last joint above anal plate. Between the dorsal 

 tubercles of each joint, two silvered granulations. Anal plate lined by a triangle of 

 white granulations. Thoracic legs green, only granulated at base. Prolegs much 

 granulated from base to feet or clasping part which is brownish. Abdominal part 

 concolorous with dorsal. Spiracles black. Infraspiracular line pink with lilac re- 

 flection, much the same as in H. to. 



Length at rest 29 mm. or ii inch, in motion 32 mm. or il inch. Width 5 mm. 

 or T 3 g inch. 



October 24, 1904, I discovered a full-grown larva of this Sphingi- 

 campid on a mesquite tree in a grove of my cactus garden, close to 

 my tent-house, and on the second day went again to the desert, where 

 I had taken the first larva, with the result of adding four more full- 

 grown larvae, of which one was crippled. I spent that day and the 

 following hunting that larva — all on P. microphylla, the leaves of 

 which are so very small that I offered a larger-leaved species, Park- 

 insonia torreyana, to my captures, which proved acceptable. I had 

 torreyana growing in my garden and saved time by using it instead 

 of the other. The cripple I put in alcohol, and mailed it to Prof. A. 

 S. Packard. I noticed the following change in this second lot of 

 larvae, all of which pupated within two days after capture. 



General color apple-green. Mouthparts brownish. Antenna; white. Outer or 

 exterior side of the tubercles white, and but little spinose. Inner side pink, tipped 

 white, at the base green, little spinose. Small tubercles silvered, tipped pink, 

 cuneif inn and pointed, the outer surface dazzling in the sunlight like a mirror. 

 Dorsal row of tubercles longest, 2 mm. long. Subdorsal tubercles 1 '•, mm. long. 



