OF WASHINGTON, VOLUME XIII, HH1. 27 



pair of impressed dots on inner pair of elevations of the posterior longi- 

 tudinally striate ridge. Segments 6 to 9 have four of these impres- 

 sions, one outside of each of the median pair. 



On the last or eleventh segment the anus is a semicircle with the 

 convex side downward, overhung by four prominent tubercles in 

 bilaterally symmetrical pairs. Mouth of the air-tube a smooth, oval 

 surface just above the anal tubercles. It has a vertical slit and is sur- 

 rounded by a projecting crenulate frill. 



PUPA. 



One of the two full-grown larva? collected by Mr. Pergande 

 pupated and female imago issued May 29, 1899. 



Length of the pupa shell 19 mm. ; greatest diameter 6.5 mm. Head 

 and thorax of the pupa a lighter, abdomen a darker ferruginous- 

 Head and thorax finely and irregularly wrinkled; anterior half of each 

 abdominal segment (1-7) finely wrinkled transversely, posterior half 

 with wrinkles less distinct or absent (especially on ventral surface), but 

 very finely and closely punctuate. This makes the color appear more 

 intense, in places almost orange. Middle of the segments, except 1, 

 surrounded by an interrupted fringe of definitely grouped, sharp- 

 pointed spines, the larger of which tend to be serrate (PI. III). 



Vertex of head marked by a narrow, rounded, longitudinally wrin- 

 kled, transverse ridge. In the depression between this ridge and the 

 antennal prominences and in front of the extremities of the ridge are 

 two outwardly-directed setse. Antennal sheaths short, appressed, 

 downwardly curved, conical, arising from two low wrinkly protuber- 

 ances (the antennal prominences above mentioned), these prominences 

 separated by a deep fold, and from them curved and diverging im- 

 pressed lines run down the face. Below each antennal sheath is a 

 widely separated vertical pair of seta;. 



Prothorax longitudinally wrinkled, except for a smooth area behind 

 and below each antennal sheath. A setiferous tubercle stands above 

 each of these smooth areas. Prothorax angulate in the median line 

 behind. Mesothorax three times as long as the prothorax, bearing 

 two spiracular tubercles near anterior lateral angles (about opposite 

 the middle of each lateral half of the prothorax). These tubercles 

 similar to those described below, but complicated by flexures of the 

 walls. They bear at the summit upwardly-arched, crescent-shaped 

 rimae or air-slits. The only setae I can find on the mesothorax are one 

 on each side directly back of these spiracular tubercles. Metathorax 

 very short in the median line, but somewhat longer at the sides, which 

 have two rounded angles anteriorly. Wing pads and leg sheaths, the 

 latter slightly the longer, almost covering ventral surface of the first 

 abdominal segment. 



Middle of each side of first to seventh abdominal segments with 



