1060 WALTER H. WELLHOUSE 



a few short hairs, third segment with numerous long spines and hairs, some with rounded 

 tip and conical base, others with pointed tip. Head with five prominent dorsal tubercles, 

 two slightly separated just above base of beak, each bearing a round-tipped spine; one tubercle 

 back of these on median linfc bearing two spines; two tubercles near posterior margin, widely 

 separated and each bearing two spines. Pro- and mesothorax having lateral tubercles with 

 a spine on each, and mesothorax having a pair of dorsal tubercles with one spine on each. 

 Metathorax and first abdominal segment without spines. Legs armed with short, pointed 

 hairs and two bent, sharp, terminal claws. Nine abdominal segments visible above, each 

 of these except the first bearing on each lateral margin a tubercle surmounted by a round- 

 tipped spine; two dorsal tubercles on second, fifth, sixth, and eighth abdominal segments, 

 those on second and eighth segments bearing one round-tipped spine each, and those on fifth 

 and sixth segments bearing two spines each; tenth abdominal segment visible from a lateral 

 or ventral view, this segment bearing no spines nor hairs; minute awl-shaped spinules over 

 dorsal surface, especially on large tubercles of fifth and sixth abdominal segments and on 

 thorax. (Plate LXXIII, 3.) 



Second stage. Length 0.68 mm., greatest width 0.27 mm. Body broader in proportion 

 to its length than in first stage; dark brown in color, with numerous minute spinules over 

 dorsal surface, covering it much more completely than in first stage. Additional small 

 spines on both dorsal and lateral tubercles, and the round-tipped spines present before having 

 a slightly longer conical base in this stage. (Plate LXXIII, 4.) 



Third stage. Length 0.82 mm., greatest width 0.44 mm. Antenna with four segments. 

 Round-tipped spines arising from a base longer than the spines, and a few additional small 

 spines on tubercles. Pro- and mesothorax beginning to increase in prominence. (Plate 

 LXXIII, 5.) 



Fourth stage. Length 1.2 mm., greatest width 0.7 mm. Wing pads of mesothorax extend- 

 ing back over metathorax and first abdominal segment at sides. Prothorax more prominent 

 than in earlier stages. Bases of round-tipped spines several times as long as the spines. 

 A few new spines present on lateral margins of pro- and mesothorax and of abdomen. Color 

 dark brown, except in an irregular band across abdomen just caudad of wing pads and on 

 lateral thirds of prothorax, where it is yellowish. Minute spinules covering entire dorsum, 

 light-colored on the yellowish parts and dark on the brown parts ; these spinules present also 

 on bases of round-tipped spines. (Plate LXXIII, 6.) 



Fifth stage. Length 1.6 mm., greatest width 0.96 mm. Wing pads now extending back 

 to fourth abdominal segment at sides, and prothorax still more prominent. A few more 

 spines on tubercles; many of the sharp-pointed spines of the earlier stages now round-tipped; 

 spines present in the earlier stages on lateral margins of segments covered by wing pads have 

 disappeared. Yellowish parts of prothorax increased in size, and distal part of wing pads 

 yellowish, giving the body the appearance of having two light bands across it. Entire dorsal 

 surface covered with minute spinules as in earlier stages. (Plate LXXIII, 7.) 



In all stages of the nymphs the larger spines correspond exactly in 

 position and shape with those so excellently described by Morrill (1903) 

 for the oak lace bug, Corythucha arcuata. The only distinguishing char- 

 acters between the nymphs of the two species which the writer has been 

 able to observe are the size and the prevalence of minute awl-shaped 

 spinules on the dorsal surface. Nymphs of C. bellula are smaller, and 

 possess more spinules, than those of C. arcuata. The larger spines of 

 both species which are mounted on elongate bases seem to have an eversible 

 sac on the tip which gives them a trumpet shape when it is drawn in and 

 a round tip when it is extended. 



The natural enemies of these spiny creatures seem to be few. Only 

 the immature stages of several spiders were seen to prey upon them. 



