CASTES OF TERMOPSIS 515 



wing vestiges are broken off, leaving jagged scars on the edge of 

 the thoracic segments. 



The legs of the second-form adult (fig. 3, d) are not larger and 

 heavier than those of the first form, as in the genus Reticulitermes, 

 the tibiae indeed are shorter, and the lateral tibial spines are mark- 

 edly smaller, varying in number from four to one. Five tarsal 

 segments are present, the second segment reduced in size, and a 

 pulvillus, onychium, is found between the claws. 



The enlarged adult of the second forvi 



The body length of the largest second-form queen of my col- 

 lection is 14 mm. ; the males are smaller, 10 to 11 mm. The color 

 of the body is pale yellow and the enlarged abdomen has the 

 characteristic bands of yellow and white. The compound 

 eyes are dull pinkish with white rims, and the vestiges of the 

 lateral ocelli may be noted. No fontanel is present. Some of 

 the wing vestiges are frequently broken ofT, leaving jagged scars 

 (fig. 6, m). The enlargement of the abdomen is as much as, or 

 more than, in first-form queens, and the caudal end is blunt, not 

 pointed. The styles, genital appendices, of the ninth abdominal 

 segment are present in both sexes. The anal cerci consist usually 

 of four segments, and rarely of five. 



Internal anatomy. The brain (fig. 4, h) is smaller than in the 

 first form, differing chiefly in the reduced optic lobes and in the 

 smaller mushroom bodies with smooth contours, lacking the 

 convolutions of the first form. In the few heads sectioned no 

 frontal gland could be detected. 



The female reproductive system is evidently well developed, 

 but owing to scarcity of material no preparations have been made. 



The male reproductive organs are intermediate in size between 

 those of the first and third forms. Sections of the testes show 

 the male sex cells in the different phases of development, but except 

 for size the testes of the three reproductive castes appear much 

 ahke. 



The fat-body is large and fills most of the abdominal space 

 but appears loose and vacuolated with age as in the other castes. 



