7*5 NEW YORK STATE MUSEUM 



active feeding in the third stage was limited to about three days, 

 though the transformation to puparia did not occur till three days 

 later. 



Description. Egg. Length 1.5 mm. elongate, elliptic, tapering 

 slightly toward one extremity. The eggs are deposited in aggluti- 

 nated masses of varying number. 



Larra, general characters. White, narrowly conical, the posterior 

 extremity subtruncate, length 2 to 13 mm. 



First stage. Length 2 to 3 mm. diameter .3 mm. tapering slightly 

 to the anterior segments, which latter taper sharply, the segmenta- 

 tion distinct and marked with a series of transverse bands of short, 

 dark, chitinous points on each body segment. The cephalo-pharyn- 

 geal skeleton is very characteristic in this stage The mandibular 

 sclerites are slender, nearly rectilinear, and at the anterior extremity 

 there may be found a pair of stomal plates, each with six minute 

 teeth ; dental sclerite rudimentary : hypostomal sclerite slender, 

 slightly curved: lateral pharyngeal sclerite with a long, rectilinear 

 anterior process, the main part being a broad dorso-ventral bar 

 of chitin produced posteriorly at both the dorsal and ventral angles 

 as a tapering and relatively narrow process. The dorsal sclerite 

 is slender, strongly looped and unites the two lateral pharyngeal 

 plates (plate 4. figure 1) ; posterior spiracles (plate 5. figure 1) 

 with one well-developed, narrowly oval orifice and apparently a 

 rudimentary second. 



Second stage. Length 3.5 to 6 mm. diameter about 1 mm. Gen- 

 eral characters as in the preceding stage. Cephalo-pharyngeal 

 skeleton : mandibular sclerites moderately heavy, somewhat de- 

 curved and irregular : dental sclerite moderately heavy, short. 

 broadly triangular : hypostomal sclerite shortened, heavy, irregular 

 and united with its fellow by a moderately broad dorsal process; 

 lateral pharyngeal sclerite consisting of a broad dorso-ventral plate 

 with a curved, tapering process on the anterior ventral angle ; a 

 short, broad, truncate process posteriorly on the dorsal angle and a 

 longer, tapering process posteriorly on the ventral angle, the dorsal 

 sclerite rather broad and strongly arched (plate 4. figure 2 ) : struc- 

 ture of anterior spiracle indistinct : posterior spiracles (plate 5, 

 figure 2), each with two slightly curved, well-chitinized orifices. 



Third stage. Length 13 to 17 mm. diameter about 3 mm. Gen- 

 eral structure about as in the preceding stages. Cephalo-pharyngeal 

 skeleton : mandibular sclerites stout, heavily chitinized, strongly de- 

 curved : dental sclerite small, broadly triangular : hypostomal sclerite 

 short, irregular ; lateral pharyngeal sclerite broad, with a long, 



