1907.] NATURAL SCIENCES OF PHILADELPHIA. 19 



advance in ajjc they become darker in color and exliibit two dark eye- 

 spots of the developing embryo. 



Pupa (PI. IX, fig. D). — Length varying but little from 1 mm. Color 

 of abdomen a light rusty brown, head and thorax l)lackish, wing pads 

 and legs dusky brown. As the time for moulting approaches a heavy 

 fringe of short stout wax threads or scales develop about the margins of 

 the head and prothorax and along the median dorsal line of the cephalo- 

 thoracic plate, and about six small glands on either side of the cephalo- 

 thoracic region push out long slender dividing threads of the same 

 material. Near the time for moulting the body becomes covered with 

 a white powder and the wax glands posterior to the prothorax are 

 indicated by little w'hite spots of secretion, but no threads are devel- 

 oped. The lateral rows of glands may be traced upon the abdomen 

 to about the sixth segment, while the middle rows upon the dorsum 

 usuall)^ end upon the second or third segment. 



Winged Female (PI. X, figs. A and B). — Color a rusty brown through- 

 out just after shedding the pupal skin, but the head and thorax soon 

 become nearly black in color. A measurement of thirteen examples 

 gave lengths varying between .85 and 1.15 mm., the variation being 

 due chiefly to the different lengths of the abdomen, as in some it was 

 fully extended and in others the terminal segments were contracted. 

 The wings are a little smoky in appearance, due to a great number of 

 curved black dashes that are rather closely set over the entire surface. 

 The wings vary little in length, the anterior pair measuring but little 

 either side of 1.5 mm.; venation normal for this genus, the subcostal 

 nerve strong and, with its large lanceolate stigma, smoky brown in 

 color. There are two simple transverse nervures and the stigmal 

 nerve is long and nearly straight, ending in the center of the apex of 

 the wing. 



The posterior wings are lanceolate in form, a little more than one- 

 half the length of the front wings (ratio 1 to 1.7), and have two or three 

 chitinous hooks on the costal margin. The transverse nerve is wanting 

 (see PI. X, fig. A). 



Antenna dusky brown, five-jointed and .26 mm. in length; the 

 terminal joint is slightly the longest (.067 mm.), joints 3 and 4 

 subequal (.06 mm.), the first and second joints short and cjdindrical 

 and of about the same diameter as the others; joints 3, 4 and 

 5 fusiform and imbricated; the distal ends of 3 and 4 trun- 

 cated, but the fifth joint tapering gradually to the apex. Joints 3, 

 4 and 5 have each a large oval sensorium on the ventral side. 

 There are about five hairs at the apex of the terminal segment and a 



