24 University of Michigan 



of the segments. Segments with fulvo-ferruginous band about 

 caudal border embracing more than half the length of meta- 

 zonite. Covered portion of prozonite also pale. The dark 

 region of prozonite including numerous light spots or areo- 

 lations, particularly on sides. On some of the segments the 

 light color may encroach upon the dark ring so as in part 

 almost to obliterate the latter. Last tergite and anal valves 

 dark, excepting a narrow caudal border on each side of the 

 former. Median region of collum areolated with light. Head 

 with a dark band between eyes and extending ventrad between 

 antennae ; vertex areolated with light. Legs light ferruginous. 



Sulcus across vertex as usual. Eyes more elongate trans- 

 versely than in orthacanthus; ocelli 57 in number, in seven 

 series, thus: 10, 11, 11, 10, 8, 5, 2, the two of lowest series 

 very small. Lower margin of cardo of mandibles concavely 

 excavated as shown in PI. 12, Fig. 83, a deep margining sul- 

 cus above it. 



Lower end of collum less abruptly bent under than in 

 orthacanthus, and the lower angular part bent down more 

 nearly vertically below level of second tergite where the latter 

 exceeds it in orthacanthus. (See PL 12, Fig. 82.) 



Segmental suture differing from that in the preceding spe- 

 cies in being more slightly curved opposite the pore, often 

 essentially straight, and more nearly smooth, not marked by 

 such deeply impressed coarse punctae. Pore at or near caudal 

 edge of dark ring. 



Anal scale longer in proportion to width than in orthacan- 

 thus and more obtusely angled posteriorly. (See PI. 12, Fig. 

 84, in comparison with Fig. 8.) A conspicuous difference 

 is also presented by the last tergite, which is more acutely 

 angled behind and presents a deep transverse furrow behind 

 which the plate is depressed and more roughened. Compare 



