338 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



darker than the rest of the abdomen. Margin broad crenulated. 

 Mcsad the margui ends at a broad ridge which separates it from the 

 rest of the dorsum. Along its edge are a series of large closely 

 apposed pores which produce a short but abundant horizontal fringe 

 of wax. The upper surface of the margin bears a large number of 

 extremely minute pores. These pores produce a quantity of white 

 fluffy wax filaments which curve inwards and cover the dorsum. 

 VentraUy a httle within the margm there are a series of pores which 

 produce a small quantity of wax. The dorsum is covered with a 

 number of stout spines. There are a pair on the cephalic region at 

 end of mesio dorsal ridge and nearly on the margin; two pairs placed 

 fairly close together on the cephahc region; a pair placed widely 

 apart on the thoracic region; immediately behmd this pair there are 

 two pairs placed fairly close together on the lower edge of the mesio 

 dorsal ridge; a pair of spines on each of the third, fourth, and fifth 

 abdommal segments; and two stout curved spines, one on each side 

 of the vasiform orifice. There are two short setae, one on each side 

 of the vasiform orifice and two fairly long setae caudad on margin. 

 The vasiform orifice as m preceding stages, but in some specimens 

 the Imgula appears large and dumb-bell shaped. 



Larva, fourth stage. — Size, 1.4 mm. by 0.9 mm. 



Shape elliptical, anterior edge abruptly conical. Color, dense 

 black. Mesio dorsal ridge as in precedmg stages. A broad crenu- 

 lated margin which ends mesad in an elevated ridge which separates 

 it from the rest of the dorsum. The margm ends m a series of large 

 closely apposed pores which produce a short thick marginal fringe 

 of white wax. The upper surface of the margm is covered with a 

 large nimiber of minute pores which produce a quantity of white 

 fluff, which, curving mwards, covers the dorsum. Segments of abdo- 

 men distinct. The dorsum is covered with a large number of stout 

 spines which lie — five pairs on the cephahc region; four pairs on the 

 thoracic region, and five pairs on the abdominal segments. There is 

 also a stout curved pair situated one on each side of the vasiform 

 orifice. There are two short setae, one on each side of the vasiform 

 orifice and a shghtly longer pair caudad on margin. Vasiform ori- 

 fice large m proportion to its size as compared to the vasiform orifice 

 in the puparium. 



Puparium. — Size, 2.1 mm. by 1.4 mm. 



Shape elliptical, broadest caudad. Color, dense black. Distinct 

 mesio-dorsal ridge, which is narrow and sharp anteriorly and broad 

 and rounded posteriorly. From this ridge there are a series of five 

 ridges which mark out the abdominal segments. Margin broad, crenu- 

 lated, bearing on its upper surface a large number of minute pores 

 which produce a quantity of white wax filaments which curling 

 inwards conceal the dorsum. There are a series of closely apposed 



