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190OJ 
the ])o.sterior one curved backwards ; above the spines are small brown papillae ; 
the posterior portion bears on each side three large, hairy, spine-like processes, 
and terminates with a prominent, shiny brown respiratory tube, showing slight 
annulations on the middle. 
The larvae were collected near .\uburndale. Mass., .March 26, 1905. They 
commenced pupating March 31, and continued to do so until April 3, the imagos 
appearing from .April 12 to 15. On June 16, 1904, I captured the adults of this 
species at the same locality. The pupa ( Fig. 6), is about 10 mm. in length ; dark 
brown in color, the black spines and small jrapillae of the larva being still present, 
w'ith an additional pair of larger papillae above ; the posterior portion also has a 
similar appearance to the larva, retaining the lateral processes and respiratory 
tube. The imago emerges through the upper portion of the first two segments. 
The larva of this species was also found under similir conditions near South 
F'ranungham, Mass . by Mr. A. 1 ’. Morse. 
Figure 7 represents a larva found by Mr. Owen liryant at Cohasset, during 
the latter part of .September, among some “ woolly ” aphids on the wdld lettuce 
( I.actnca f/ongata ). The larva was very Hat, about 7 mm. in length, slightly 
roughened, and of a dull yellowish color. It evidently belongs to the Svrphidae. 
1 did not succeed in getting it to pupate. 
Zaisrachia poi.ita Ooquillett, Plate I, Figs. 8, 9. 
Z. poUta t'oq., .Aquatic Insects in the .Adirondacks ( \. V. State Museum, 
Hull. 47, p. 585. 1901 ). 
■Associated with the larva of Xyloia pigm ( Fabr. ) were a number of small 
larvae which proved to be this interesting little Stratiomvid, allied to the genus 
Rachygaster. d’he larva ( F'ig. 8) is about 5 mm. in length, somewdiat flattened, 
of an obscure brownish color, shiny, with a transverse row of long hairs at or 
near the middle of each segment, d’he cephalic portion is narrow and of a 
reddish color ; the posterior segment broadly rounded, with a narrow' ventral 
opening and six long terminal hairs. 
This larva cannot be properly classed as an aquatic insect, as the decayed 
bark in which the specimens were kept frequently became cpiite dry without any 
apparent injury, almost every specimen reaching maturity. .Although not in 
water the larva has the same habit as those of Oilon'omyia, etc., of extending the 
posterior end of its body upward as shown in figure 9. The pupa is formed within 
the larval skin, with no apparent change, so that the date of pupation cannot be 
given. The imagos commenced to appear May 12, and continued to do so until 
June 20. 
