Genus Tygarrup Chamberlin, 1914

Diagnosis.

Mecistocephalids with head distinctly longer than wide; clypeus with an entire plagula, without mid-longitudinal areolate stripe and extending to the lateral margins of the clypeus; cephalic pleurites without both spiculum and setae; first maxillary coxosternite medially divided by a sulcus, without antero-lateral corners; second maxillary coxosternite medially undivided, with the grooves from the metameric pores reaching the lateral margins; second maxillary telopodites distinctly overreaching the first maxillary telopodites, with claw-like pretarsus; forcipular tergite only slightly wider than long, without a distinct mid-longitudinal sulcus; forcipular trochanteroprefemur with only a distal denticle, tarsungulum without denticle; invariably 43 or 45 leg-bearing segments; sternites with non-furcate mid-longitudinal sulcus and sometimes with pore-fields; legs of the ultimate pair ending with a short spine. See Table 6.