8 University of Michigan 



the head. Paired sulci distinct on tergites from second to twenty- 

 second inclusive, lateral sulci for the most part not obvious and 

 median keels absent or obsolete. 



Ventral plates with a median longitudinal sulcus which is 

 interrupted over caudal border and over about the second fifth 

 of its length. Last ventral plate with caudal margin weakly- 

 concave. 



Coxopleural processes very short, practically reduced to the 

 single terminal spine. Coxopleurae wholly unarmed. Pores small 

 and very numerous. 



Spiracles circular, rather large. 



Tarsi of all legs but the last biarticulate, but the two joints 

 not movable upon each other. Metatarsus of all legs from first to 

 antepenult with the usual spur at distal end on anterior side, 

 otherwise legs wholly unspined. Penult legs unarmed. 



Femur of anal legs somewhat triangular in cross-section, being 

 dorsally flattened with a furrow at distal end and ventrally com- 

 pressed to a ridge which bears three long straight processes which 

 project ventrocaudad, or less commonly four or even five such 

 processes; otherwise without spines or spinules but with numerous 

 very short hairs each of which arises from a nodule or slight 

 tubercle. Tibia and metatarsus wholly unarmed, bearing short 

 hairs from nodular bases Kke those of the femur (Plate II, Fig. 8). 

 First joint of tarsus half or more the length of the metatarsus; 

 distal division or flagellum of tarsus composed of distinct articles 

 of variable length and mostly from nineteen to twenty-five in num- 

 ber; setae of tarsus short (Plate II, Fig. 9). 



Length, to 50 mm. 



British Guiana, Dunoon: Labba Creek, sand hills, July 27 

 and August 25, 1914; and sand-hill forest, August 17, 19, 20, and 

 24, 1914. Nine specimens. Type, M.C.Z., 2176. 



A female numbered loi is accompanied by her numerous eggs, 

 the field note stating that "it was found in a small cavitv in a 



