4 CIRCULAR 295, U.S. DEPARTMENT OF AGRICULTURE 



The second-stage larvae have no appendages except their mouth 

 parts; and their bodies, which are but slightly longer than broad, 

 narrow somewhat posteriorly, and are pale yellow. The males can 

 first be distinguished from the females about the middle of the second 

 stage, when they become more elongate and pink, and develop two 

 pairs of rudimentary eyes. 



The adult females are slightly wrinkled and still pale yellow until 

 the developing egg mass within the body gives them a purple appear- 

 ance. When full grown they are but slightly longer than broad, 

 being about 1.25 mm long by 1.20 mm wide. As the time for egg- 

 extrusion nears, the last body segment is drawn up so that the body is 

 about four fifths as long as broad (fig. 4, A, c). 



The male propupae have no mouth parts or pygidia but retain their 

 coal-black rudimentary eyes, regain the rudimentary antennae and 



Figure 3.— The obscure scale on pecan bark: A, A single male scale specimen; B, two female scales. X 8. 



legs, and develop wing pads. They are salmon-pink, oval, and slightly 

 less than 1 mm long. 



The pupae are like the propupae in size and shape, their antennae, 

 wing pads, and legs are further developed, and a prominent pro- 

 tuberance, or anal style, is present at the rear end for the first time. 



The adult males are tiny, frail, salmon-pink to brick-red, flylike 

 insects with a mahogany-colored band across the thorax and a long 

 anal style. 



The covers of adult females are slightly convex, somewhat irregular 

 in outline, slightly longer than broad, and about 3 mm (about one 

 eighth inch) in length. They blend in color with that of the bark 

 surface on which they rest, being of varying shades of gray to black, 

 and have a prominent lip at the rear end when full grown (figs. 3, B, 

 and 4, A). 



