28 



PLANT-BUGS INJURIOUS TO COTTON BOLLS. 



Fig. 4. 



-The conchuela: Nymph, third instar. 

 ters. (Original.) 



Enlarged 13 diame- 



markings are sometimes present on the venter. The Hnes of the 

 segments are usually dark in color. The length in this instar varies 

 from 3.5 to 4 mm., and the width from 3 to 3.5 mm. 



Fourth instar. — The fourth instar is characterized by the first 



external evidence of 

 the developing wing- 

 pads. The ventral 

 side of the head, 

 and sometimes the 

 two basal segments 

 of the beak, are 

 more or less oliva- 

 ceous. The black 

 crescentic markings 

 inside the margin 

 of the abdominal 

 segments are more 

 distinct than before. 

 Otherwise the color 

 corresponds very 

 nearly with that of the third instar. The length of the fourth- 

 instar nymph varies from 4.8 to 6.5 mm., and the width from 3.7 

 to 5 mm. 



Fifth instar. — In the last or fifth nymphal instar the head and 

 thorax are rarely uniformly black as in the two preceding instars but 

 are more or less oliva- 

 ceous, with black punc- 

 tures. The venter of 

 the thorax has usually 

 an olivaceous but 

 sometimes a pale pur- 

 plish or rosaceous 

 ground color, with 

 black punctures and 

 markings. The basal 

 segments of the legs 

 are more or less oliva- 

 ceous. The abdomen 

 is colored as in the 

 previous instars except 

 that the ventral series 

 of spots along the mesal line is either absent or only faintly indicated. 

 The length of the nymphs in the fifth stage varies from 9 to 1 1 mm., 

 and the width from 6 to 8 mm. 



Fig. 5.— The conchuela: Nymph, fourth instar. Enlarged 10 

 diameters. (Original.) 



