350 PROCEEDINGS OF THE NATIONAL MUSEUM. w"^- 51. 



Egg. — Length 0.192 mm.; width 0.15 mm.; form slightly oval; 

 surface marked with hexagonal areas, the diameter of which is about 

 0,012 mm. This appears to be a network on the exterior of the egg, 

 which may become detached from it. Stalk very long, 0.288 mm., 

 attached evenly at the base of the egg; color hght yellowish brown. 



Larva. — One specimen of the larva is present, but it is in too poor 

 condition to give any acciu-ate details. It is 0.24 mm. long, pale 

 yellowish, and armed with an uncertain number of long spines. 



Pupa case (fig. 7). — Size 1.01 mm. by 0.72 mm.; color on leaf 

 deep black, dark brown under the microscope; shape somewhat 

 oval, ^vith the margin shghtly "angled" at several places, as shown 

 in the figure. Tlie abdomino-thoracic suture is distinct; the median 

 dorsal area forms a slightly elevated ridge, and extending from the 

 abdominal segments outward to the margin of the case a nmnber of 

 folds or ridges are noticed. The surface appears more or less imevenly 

 pigmented, giving a granular or mottled appearance to the submar- 

 ginal area. On the submarginal area, forming a ring around the 

 case, is a row of about 20 spines, all of about the same length, 

 averaging 0.128 mm. in length. In the cleared specimens these 

 spines are of a deep brown color at the base and yellowish toward 

 the tip, which is more or less jagged (fig. 10). Ten of the spines 

 of this row are on the thoracic area and 10 on the abdominal area. 

 On the thoracic region, more mesad than the row of spines just 

 mentioned, are usually six pairs of very small spines forming a row 

 down each side of the median ridge. On the abdomen there are 

 three pairs of spines on the median ridge, two pairs of small ones 

 close together on the cephahc extremity of the abdomen and one 

 pair of rather large spines just anterior to the vasiform orifice. 

 Other than these, there are five pairs of smaU spines situated on the 

 subdorsal area as shown in the figure. The vasiform orifice (fig. 9) 

 is elevated, forming the caudal extremity of the median ridge. It is 

 somewhat circular in outUne, flattened cephalad, and its anterior 

 margin is irregular in outUne. The operculum is somewhat similar 

 in shape, though more rectangular, and almost completely fills the 

 orifice, obscuring the Hngula. The margin is dentate with the teeth 

 very acute and regular, a space of 0.1 mm. being occupied by about 

 26 teeth (fig. 8). At the base of these teeth are a number of small, 

 circular, clear pore-hke areas, and arranged around the case a short 

 distance from the margin is a series of tubercled setae. A pair of 

 long, rather fine hair-Hke bristles is situated on the thoracic region 

 near the median fine, and a pair of setae is situated just cephalad of 

 the vasiform orifice. 



On the leaf the specimens are sohd black and shining. There is 

 little, if any, dorsal secretion, but the margin all around has a narrow, 

 white, shghtly flocculent waxy fringe. The cases occur very spar- 



