148 Annals Entomological Society of America [Volkov 
sides immediately in front of them but little excurved, diverging for- 
ward to the lateral interruptions which are distinct. The short curved. 
transverse submarginal sulcus opposite interruption of each side evident. 
The usual semi-circular impression on caudal portion clearly marked. 
There is also present a transverse sulcus immediately caudal of and 
subparallel with frontal suture, the sulcus being most distinct at the 
sides. Surface sparsely punctate and moderately uneven. 
Posterior dorsal plates conspicuously roughened; the anterior ones. 
less strongly so and the first uneven only in about same degree as head. 
The short transverse sulci most distinctly impressed on the more caudal 
plates, mostly weak on the anterior ones. Caudal plates with short 
hairs more numerous than on the anterior. Posterior angles of the 
seventh, ninth, eleventh and thirteenth dorsal plates strongly produced ;. 
processes of ninth, eleventh and thirteenth long and acute, those of the 
seventh obtusely rounded, the inner or mesal edges being convex and 
long with its ectal or distal portion nearly transverse. 
Anal segment in the male densely clothed above with rather long 
hairs, most of which are curved or uncinate at tips, this being a very 
characteristic feature of the species. In the female the dorsal hairs of 
this segment are sparse and straight. 
The three longitudinal sulci of ventral plates distinct, being on most. 
broadly and deeply impressed to a little in front of caudal margin. Last 
plate more densely clothed with short hairs. Sternite of genital segment 
also densely clothed with hairs especially in the male. 
Antenne reaching the beginning of the eighth segment; attenuated,. 
very slender distally. Composed of mostly from 32 to 35 articles. 
which, distad of the first few, are rather short, considerably shorter 
ones occurring at intervals among longer ones as in related species. 
Eyes composed of from 28 to 42, but mostly from 30 to 36, ocelli 
which are arranged. o from 5 to § series; e. g., 1+3, 4, 6, 6,6; 57 1-63) 4, 
6, 6, 6, 6, 3; 1+6, 5, 6, 5, 4, 4, 4; 1+6 5, 6, 5, 5. Single ocellus moder- 
ately large, oval. all aaa ocelli deeply pigmented excepting those: 
of first row which are commonly paler as in related species. Of seriate 
ocelli the caudal ones of first row are clearly the largest. 
Prosternum about 1.7 times wider than long. Distance between 
chitinous spots 1.8 times the width at level of bottom of mesal incision, 
and 2°5 to 2.7 times as great as length of dental line, the variation 
depending on number of teeth. Teeth 5+5 or 6+6, or occasionally 
5+6; distally narrowly rounded. The prosternal spine situated 
immediately ectad of outer tooth as usual, slender and bristle like, and 
curved as in voracior. 
In larger specimens the coxal pores are very large and strongly 
transverse, while in the smaller axults the form may approach that of 
the pseudomaturus stage, being transversely elliptic and with those at 
ends of rows often subcircular. In number and arrangement from 
6, 6, 6, 5 to 8, 8, 8, 7, other arrangement noted being 6, 7, 7, 6, to 7, 7, 7, 5, 
and. (8. on Ge 
