50 BULLETIN 417, U. S. DEPARTMENT OF AGRICULTURE. 



terminated with a bristle. Numerous other hairs occur on these caudal appendages. 

 The ventral portion of the body is yellowish white except the parts which are strength- 

 ened by chitinous plates. 



Spiracles seal brown, nine on each side, borne in shallow depressions just below 

 the lateral edges of the dorsal plate, on the mesothorax and on each abdominal seg- 

 ment except the last. Those on the abdominal segments are small and circular, 

 while the thoracic spiracles are decidedly larger and elliptical in outline. Legs 

 small, very muscular and spiny. Coxae very stout, dark brown; trochanters, femora 

 and tibiae slender, reddish brown; tarsi of same color, one jointed and bearing two 

 simple claws. The anal proleg is slender, tapering and bears a number of short 

 spines. This appendage serves the double function'of acting as an organ of locomotion 

 and also containing the cavity into which the rectum discharges. General color of 

 under surface sordid white, varying to light gray, variously marked with light seal- 

 brown patches. Head and anterior part of prothorax seal brown. Two lateral rows 

 of elongated markings of similar color extend along the body beneath the spiracles. 

 The upper row terminates on the penultimate segment, the lower row on the last 

 segment. 



The markings forming the upper row are single and entire on the first two thoracic 

 segments; on the metathorax there are two spots, the anterior being the smaller. 

 On the abdominal segments the markings are somewhat circular, two to each segment, 

 a large orbicular marking being followed posteriorly by a smaller one of similar shape. 

 The markings composing the lower row are in general elliptical, and occur singly on 

 the segments stated. On both the meso- and meta-thorax there is a single small 

 brown spot on the median line. In a corresponding position on each of the following 

 segments except the last two, and near the anterior margin, there is a large elliptical, 

 transverse, seal-brown spot. Posterior to this marking on each of the segments men- 

 tioned there is a transverse row of four small spots of similar color. On the last two 

 segments the median spot is quite large and somewhat pentagonal in outline. The 

 transverse row of small spots occurring on the preceding segments is here absent. 



The full-grown specimen measured and referred to in the foregoing 

 description was probably abnormally large, as those measured 

 recently do not exceed 30 mm. in length. Larvae in this stage have a 

 reddish-brown patch at the base of the caudal appendages. 



THE PUPA. 



Following is a description of the pupa: 



Length, 18 mm.; width at first abdominal segment, 6.4 mm. Oblong, somewhat 

 elliptical and flattened. General color of the body pale amber. Head medium, 

 somewhat flattened in front and strongly depressed beneath the thoracic segments. 

 Eyes prominent, seal brown in color. Antennae and mouth parts free, translucent. 

 Prothorax broader than long, considerably narrowed behind ; mesothorax emarginate 

 in front and two-thirds as long as the metathorax; all separated by well-defined 

 sutures. Wing covers translucent and extending beyond the third abdominal seg- 

 ment. Abdominal segments nine in number, the sides of the body protruding beyond 

 the dorsal portions. The lateral edges of abdominal segments 2 to 6 produced to a 

 blunt point, within which is a slight depression. Penultimate segment slightly de- 

 pressed; last segment greatly depressed beneath the body, and bearing on the pos- 

 terior margin a pair of small anal stylets. Each of the first five abdominal segments 

 bears a narrow brush of erect brown hairs, which extends two-thirds of the distance 

 across the segment. The nine pairs of spiracles are light chestnut brown, and are sit- 

 uated in the same relative position as those of the larva; they are larger, however, 

 and elliptical in outline, those on the metathorax being the largest. Legs free, 

 translucent, and nearly surrounded by the wing covers. 



Although a few adults were reared from larvae in 1909, no specific 

 data were secured on the exact time passed in the pupal stage. 

 August 2 one full-grown third-stage larva was collected in New 

 Hampshire and fed until August 9. August 13 it was transferred to 

 a small fly-screen cage, which was set in the ground, and allowed to 

 bury up for pupation. October 4 the cage was removed and a young 

 living female was found in a cavity 6 inches below the surface. The 

 female was replaced in the same cage in a cavity 2 inches below the 



