514 CAROLINE BURLING THOMPSON 



but, as in the case of the first form, is probably similar to that of 

 the young adult described below. 



The young adult of the second form 



The body length of the young adult of the second form is about 

 11 to 12 mm. The color of the body is pale yellow with darker 

 chitinized areas on the clypeus and mandibles. The head is 

 shghtly broader than that of the first-form adult and tapers less 

 in front of the eyes. The eyes are pinkish with a white rim, 

 oval and not reniform, 0.2 by 0.1 mm., shghtly smaller than the 

 eyes of young first-form nymphs of similar length with which 



Fig. 7 Termopsis angusticollis. Second-form adult with unusually short 

 wing vestiges, thorax, m, scar or mutilation. Spencer oc. 6, obj. 32 mm., stage 

 level, reduced one-third. 



these young adults are sometimes confused. No fontanel is 

 present. Two Hght crescentic areas, vestiges of the lateral ocelli, 

 are seen on the frontal surface of the head, in a position similar to 

 that in first-form individuals. The meso- and metathoracic 

 segments are very broad from side to side, evidently a primitive 

 character, as it will be recalled that this condition was noted in 

 the younger first-form nymphs. The wing vestiges are very 

 short and are variable in length, in some specimens (fig. 7) ap- 

 pearing merely as heavy lateral borders to the thoracic segments, 

 in others (fig. 6) as small scale-like vestiges that extend over part 

 or all of the second abdominal segment. The venation of these 

 tiny wing vestiges is similar to that of the adult in that the main 

 trunks of the homologous veins are present. Very often some 



