508 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
plates bisuleate; on anterior tergites also a clearly impressed median 
longitudinal sulcus. 
Prescuta mostly very short over entire length, a longer one occurring 
~ occasionally at irregular intervals. 
Ventral plates with a median longitudinal sulcus extending from 
anterior margin to caudad of middle where it commonly ends in a 
weaker transverse furrow. 
Last ventral plate broad; sides straight and strongly converging; 
caudal margin moderately angularly bent in from ends to middle. 
Ventral pores small and rather sparse; arranged in a very narrow 
transverse band between middle and caudal margin. 
Coxopleurae each with two large pits of which the inner portion is 
covered by the last ventral plate. 
First spiracle subvertically obovate, the second and third less 
elongate and the fourth and ‘succeeding ones circular. First spiracle 
clearly the largest, the others very gradually decreasing in size caudad, 
the anterior ones being large and the most caudal ones small or 
minute. 
Anal legs very much longer than the penult. In the male crassate; 
the femur thickest with the tibia and first tarsal joint a little thinner 
and the second tarsal joint abruptly much thinner (Plate 3, fig. 3). 
Armed with a distinct slender claw. Hairs mostly short, sparse. 
Pairs of legs 59-63. 
Length up to 26 mm. 
Locatities.— Mexico: Hidalgo, Guerrero Mill (W. M. Mann). 
Typr, M. C. Z. 1723. Mexico: Pachuca (W. M. Mann); Distrito 
Federal, Esclava (O. W. Barrett); four specimens. Type and M. C. Z. 
1771, N22, Li24. 
LINOTAENIIDAE. 
PAGOTAENIA, gen. nov. 
Head small; a true frontal suture not present. Basal plate wide. 
Prebasal plate not exposed. Dorsal plates not bisulcate. 
Antennae filiform. 
Labrum free; tripartite. Median piece very large, overlapping 
the small lateral pieces; conspicuously arcuate with the free caudal 
border fringed with close set spines across entire width much as in 
Azathothus. 
First maxillae with coxae completely fused; coxal plate at each 
