375 



bristles two and three each a colateral pair; a long lateral bristle 

 inserted greatest diameter of segment from proximal end; a 

 median bristle inserted slightly dorso-proximad of fourth ventral 

 bristle. Tibiae with dorsal outline more smooth; major bristle 

 very long, extending to unguis without straightening out ; lateral 

 bristle inserted on transverse plane of major; dorsal bristle in- 

 serted slightly more proximad; median bristle inserted still more 

 proximad, still not quite diameter of segment from distal end, 

 shortest of three, ventral bristle longest of these three. Genuals 

 with dorsal bristle quite stout, gracefully curved; lateral bristle 

 stout, double ciliate. Femora with flange narrower, especially 

 at proximal end, not extending along ends; dorsal bristle inserted 

 proximad of center, extending to center of genuals thus consider- 

 ably longer; a shorter, more slender bristle inserted close to dorsal; 

 ventral bristle very similar to median of genual. Coxae only 

 faintly wrinkled on distal face ; flange much narrower and less ex- 

 tensive; the bristles longer, stouter. 



The color varies with locality and degree of chitinization but 

 in general is quite dark amber with some reddishness. The sur- 

 face of the chitin is smooth but specimens from some localities 

 have a granular coating, especially on notogaster, which is prob- 

 ably caducous. 



Degree of specialization. — Due to the complete lack of bristles 

 on notogaster, the great expanse of pteromorphae, the high de- 

 velopment of the tectopedia, the development of lamello-rostral 

 ridges, the well-developed areae porosae, and the specialized 

 arrangement of the leg bristles, especially of leg I, this species is 

 one of the more highly specialized among the Ceratozetini. I 

 know of no closely related species. It is interesting to note that 

 legs III which are most covered by the pteromorphae have much 

 longer and stouter bristles than legs IV. Compare especially 

 the ventral bristle of the femora. Conversely, the flanges of 

 femore IV and coxae IV are highly developed, while those of legs 

 III, covered by the pteromorphae, are poorly developed. 



Dimensions. — Thirty-one specimens from Breda, Holand, have 

 a total body length of 800 (850), 925 and a total breadth of 545 

 (605) 655. By contrast, the detailed dimensions of twenty-five 

 .specimens from the town of Monroe, Connecticut, follow. In 

 the first three columns are the dimensions (smallest, average of 



