EXPLANATION OF PLATE XLIX. 



Fig. 1. — Atlelocephala arf/ijracaiitlia [=ffi,c-<ila]; natural size; copied from Burnieister. 



Fig. 2. — Adelocephala isias, stage IV, dor.-ial armature of the three thoracic and first three abdominal segments (tlie 

 dorsal horn of the third thoracic segment omitted); 2«, stage V, the dorsal tubercles; a', vestiges of 

 the prothoracic ones; I/, second thoracic (/ and ///); c' third thoracic (/ and Hi); 2b, dorsal tubercles 

 (i, /;;) on first and sixth abdominal segments; VII i, dorsal (i) on seventh abdominal segment; 2c, 

 armature of eighth and ninth abdominal segments, including the caudal horn; 2(/, caudal horn and 

 suranal plate of stage IV; 2(', suranal plate, dorsal view. From San Antonio, Tex. 



Fig. 3. — Adelocephala ixian, dorsal armature of first tlxjracic segment (1); second and third, II, III, and first two 

 abdominal segments; 3f(, of the last abdominal ,segment.«, including the caudal horn. From Browns- 

 ville, Tex. 



Fir. 4. — Addorephalu from B"azil (see p. 14 1 lli. i jirothoracic; th. 2i, th. '2iii, (l(!rsal and subdorsal horns (/, Hi); ((', «-, 

 dorsal spines of first and second alxlomiiial segments; r, caudal horn. 



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