2 2 University of Michigan 



Nanostreptus orthacanthus, sp. nov. 

 PI. II, Figs. 7476; PI. 12, Figs. 71-81 



Exposed portion of segments greyish blue or darker ovel 

 prozonite, with metazonite encroached upon by the bkie below, 

 the caudal portion of the metazonite ringed with fulvous nr 

 ferruginous to nearly white, the light ring- embracing some- 

 what more than half of the metazonite or prozonite and dark 

 part of metazonite both of same dark color, often nearly black. 

 A dark line along each side at level of pores and a dark mid- 

 dorsal line over all or much of length. Collum and head 

 typically al^ruptly darker than the following region of body, 

 deep brown or blackish, the collum narrowly bordered with 

 obscure ferruginous. Antennae and legs deep brown. 



Median sulcus of head distinct only across vertex. Cly- 

 peal foveolae 2-|-2. Eye patch wider transversely than long, 

 acutely angled at mesal end; eyes about two and one-half 

 times their diameter apart ; ocelli about 26 in number, arranged 

 in five series: c. g., 6, 8, 5, 2, 2. Antennae short, when laid 

 back on a level with the repugnatorial pores reaching the cau- 

 dal edge of collum. Cardo of mandible with lower margin in 

 ectal view straight excepting a slight angle at caudal end. 

 (PI. II, Fig. 76.) 



The lower, triangular end of the collum on each side is 

 bent obliquely under, the anterior edge of the indexed portion 

 being larger and more oblique than the posterior; inflexed 

 surface covered by four longitudinal sulci. The longitudinal 

 edge formed by bending in of lower end of collum, long and 

 straight and with a single deep margining sulcus just above it. 

 In situ the antenna lies in the hollow below this edge! (PI. 

 II, Figs. 74, 75.) 



Suture of segments deep and coarse throughout, marked 



